All Free Online Tools

A shared spot to drop files, links & text across any network. No login.

Trace any IP address — location, ISP, ASN and timezone.

See your public IP, location, ISP and browser info instantly.

Calculate subnet masks, network ranges and host counts.

Calculate CIDR notation, IP ranges and prefix lengths.

Convert IPv4 addresses to IPv6 mapped equivalents.

Convert IP addresses between decimal, binary and hex formats.

Check if an IP is private (RFC 1918) or public.

Identify the manufacturer of any MAC address.

Look up A, AAAA, MX, TXT, NS and CNAME records.

Find the domain name associated with an IP address.

Look up domain registration and IP ownership data.

Check DNS record propagation across global resolvers.

Check if an IP is blacklisted on public RBL zones.

Inspect HTTP response headers of any URL.

Parse and analyze browser user agent strings.

Find the ASN and network owner for any IP address.

Test HTTP round-trip latency to multiple endpoints.

Check reachability of common ports on any host.

Parse email headers to trace route and delays.

Calculate the distance between two IP locations.

Trace the full redirect chain from any URL.

Check if a website is reachable from our network.

Split a network into variable-length subnets.

Calculate IPv6 prefix boundaries and subnet counts.

Compress or expand IPv6 addresses to full notation.

Parse and validate SPF records for any domain.

Check DMARC policy and parse report addresses.

Check certificate issuer and expiry date.

Estimate download time from file size and connection speed.

Sort, deduplicate and filter a list of IP addresses.

Calculate max payload for a given MTU and encapsulation overhead.

Estimate real achievable throughput from rated bandwidth.

Build correctly formatted DNS zone file records from form inputs.

Interactive CIDR-to-hosts reference table you can filter and search.

Full domain audit — DNS, SPF, DMARC, SSL grade, uptime and blacklist in one dashboard.

Count words, characters, sentences & reading time.

UPPERCASE, lowercase, Title Case, Sentence case & more.

Your exact age in years, months, weeks and days.

Days, weeks and months between any two dates.

Final price and savings after a percentage off.

X% of Y, percent of, increase/decrease.

Tip amount and split the bill between people.

Convert numbers ↔ Roman numerals.

Length, weight, temperature, speed & volume.

Add or remove tax at any rate, any currency.

Hours & minutes between two times.

Add or subtract hours, minutes & seconds.

Grade point average from courses & credits.

Weighted final grade from your scores.

Convert GPA, %, CGPA to the German 1.0–5.0 scale.

Convert CGPA to percentage (CBSE & custom).

Convert a percentage back to CGPA.

Convert CGPA to the US 4.0 GPA scale.

Compare two products by price per unit to find the best deal.

Roll dice or flip coins online.

Measure your clicking speed — clicks per second across 1s, 5s, 10s, 30s & 60s modes.

Measure your WPM and accuracy in real time — 15s, 30s, 1 min and 2 min modes.

See your browser, OS, screen, hardware, network and timezone — full device fingerprint.

Real-time global earthquake map powered by USGS — filter by magnitude, view depth and get alerts for major events.

Accurate Fajr, Dhuhr, Asr, Maghrib & Isha times for any city worldwide — live countdown, Qibla compass and monthly timetable.

Test every key on your keyboard — detect stuck or broken keys in real time.

Body Mass Index from height & weight.

Calories your body burns at rest.

Daily calories to maintain, lose or gain.

Healthy weight range for your height.

Estimate body fat percentage (US Navy method).

Running pace, time and distance.

Best bedtime & wake-up times by sleep cycle.

Your dog’s age in human years.

How many calories to eat daily to lose weight at your target pace.

Set your daily fat, protein, and carb targets for keto.

Estimate daily water intake from weight, exercise, and climate.

Estimate your fertile window and ovulation day from your cycle.

Estimate your due date from your IVF embryo transfer date.

Total daily energy expenditure from BMR and activity.

Protein/carb/fat targets from calorie goal.

Fat-free mass using Boer formula.

Time-to-goal from weight and loss rate.

Calories burned by activity using MET.

Calories from step count and weight.

Daily protein target from weight and goal.

Daily fat gram target from calories.

Daily carb target from diet style.

Estimated due date from LMP.

Recommended weight gain by BMI.

Target HR zones for training.

Estimated BAC using Widmark formula.

Predict finish time from recent race.

Estimate VO2 max from run test.

BSA from height and weight.

WHR with WHO risk categories.

Grow savings with compounding over time.

Future value with regular contributions.

How inflation changes money over time.

Convert hourly, weekly, monthly & yearly pay.

Margin, markup and profit from cost & price.

Return on ad spend and ACoS for campaigns.

Units & revenue needed to break even.

Work out the late fee and total due on an overdue invoice.

How long to reach a savings goal — or how much to save monthly.

Calculate profit or loss on crypto trades including fees.

Estimate how much freelance income to set aside for tax.

Add or remove VAT/GST from any price at any rate.

Calculate overtime wages at 1.5x or 2x your hourly rate.

Estimate severance or redundancy pay from salary and years of service.

Split tips fairly among staff by hours worked or contribution level.

Calculate UK net salary after income tax and National Insurance deductions.

Calculate Pakistani income tax on salary using the latest tax slabs.

Calculate Australian PAYG tax and net income for any salary.

Return on investment from cost and gain.

Recommended fund size from monthly costs.

Federal bracket-based tax estimate.

Add or remove sales tax at any rate.

Annual property tax from home value.

Net take-home pay per paycheck.

Weighted average cost of capital.

Net present value of cash flows.

Internal rate of return from cash flows.

Projected balance from contributions.

Projected Roth IRA balance over time.

Estimated monthly benefit from earnings.

Solve PV from FV or FV from PV.

Assets minus liabilities.

Live exchange rates for 30+ currencies from the European Central Bank — instant conversion.

Create professional invoices instantly — add items, tax, logo and download as PDF. Free.

Full calculator with trig, log, powers & more.

Add, subtract, multiply & divide fractions.

Random numbers in any range.

Mean, variance & standard deviation.

Area, perimeter & angles from 3 sides.

Mean, median, mode & range.

Solve ax²+bx+c=0 with step-by-step solution showing discriminant and roots.

Check if a number is prime and list its factors if composite.

Find the greatest common divisor and least common multiple of any numbers.

Calculate log base b of x, natural log, and see the change-of-base formula.

Calculate nCr and nPr with step-by-step factorial breakdown.

Add, subtract, multiply, and find the determinant or inverse of matrices.

Square root and nth root of any number.

x^y for any base and exponent.

ln(x) with change-of-base.

n! for any non-negative integer.

Single and combined event probability.

Average with different weights.

Simplify ratios and solve proportions.

Add, subtract, multiply polynomials.

Solve ax+b=c and find slope.

Project value over time with rate.

Round to N significant figures.

Combine several PDF files into one document.

Turn images (JPG, PNG, WebP) into a PDF.

Extract a page range into a new PDF.

Save each PDF page as an image.

Add page numbers to any PDF with position, start number, and format options.

Add diagonal text watermarks to PDF pages with adjustable opacity.

Encrypt and password-protect PDFs with user and owner passwords.

Rotate all or selected PDF pages by 90, 180, or 270 degrees.

Remove specific pages from a PDF by page number range.

Extract all selectable text from a PDF and copy to clipboard.

Turn text into stylish fonts for bios & posts.

Relevant hashtags for any topic or niche.

Copy-paste emojis and aesthetic symbols.

Repeat any text or emoji many times.

Just-for-fun love compatibility score.

Download YouTube video thumbnails in multiple resolutions.

The definitive cheat sheet for image dimensions across all social platforms.

Generate harmonious color palettes from a base color or uploaded image.

Create beautiful CSS gradients with a visual editor and copy the code.

Generate favicon files in all required sizes from any image.

Generate random HEX/RGB colors.

Life Path and Destiny numbers.

Format, validate and minify JSON instantly.

Convert between HEX, RGB and HSL colors.

Binary, octal, decimal & hex conversions.

Epoch ↔ human date, local and UTC.

Convert text to and from Base64.

Create strong, random, secure passwords.

Disposable temp email inbox — receive messages instantly.

Estimate OpenAI & Anthropic API costs by input/output tokens.

Convert between AI tokens and English words instantly.

Paste any text to estimate its token, word and character count.

See if your prompt fits a model context window.

Build cron schedules with dropdowns — no syntax needed.

Convert cron expressions into plain-English schedule descriptions.

Decode a JSON Web Token to read its header and payload.

Generate 301/302 redirect rules without learning the syntax.

Generate SEO and social-share meta tags with a live preview.

Test regular expressions in real-time with match highlighting and groups.

Validate and lint YAML syntax with error highlighting.

Format SQL queries with customizable indentation and case style.

Compare two texts side by side with line-level diff highlighting.

Convert Markdown to HTML with live preview and GitHub-style rendering.

Build cURL commands with a form — URL, method, headers, body, auth.

Look up any HTTP status code with description and common use cases.

Random strings with custom charset.

Voltage drop across wires based on material, length & gauge.

Find the right resistor value for any LED circuit.

Ampacity, resistance & diameter for standard wire gauges.

Calculate output voltage from two resistors in series.

kW, kVA & kVAR for three-phase electrical systems.

Convert apparent power to real power with power factor.

Turns ratio, voltage & current for ideal transformers.

Estimate device runtime from battery capacity & consumption.

Decode capacitor values from printed codes & markings.

Resonant frequency of LC tank circuits.

RC charge/discharge time constant from R & C values.

Convert between star (Y) and delta (Δ) resistor networks.

Required trace width for a given current & copper weight.

Convert between frequency and period for any waveform.

Calculate conduit fill percentage per NEC guidelines.

Decode 3 and 4 digit SMD resistor codes to ohms.

Convert between horsepower, kilowatts and amps for motors.

Convert light output to illuminance over any area.

Convert HVAC cooling capacity between BTU/hr, tons, and kW.

Convert American Wire Gauge to diameter in mm and cross-section in mm².

Calculate RC time constant and capacitor charge/discharge time.

Decode 4/5/6 band resistor colors to resistance and tolerance.

Calculate real, reactive, apparent power and correction capacitor size.

Estimate daily/monthly kWh output from panel specs and sun hours.

Calculate voltage, current, resistance & power using V=IR.

ρ = m/V — solve density, mass, or volume from any two.

Solve for force, mass, or acceleration.

Total resistance and branch currents for parallel resistors.

Work done by force over distance at angle.

KE=½mv² — solve for any variable.

PE=mgh — solve for any variable.

p=mv plus impulse calculations.

Final velocities v1', v2' for a 1D elastic collision.

Combined velocity when objects collide and stick together.

v=fλ — solve for wave speed, frequency, or wavelength.

F = Gm1m2/r² — gravitational force between two masses.

Range, height, and time from launch speed.

Time and velocity under gravity.

Centripetal accel/force, period, ω from r and v.

J = FΔt = Δp — solve force, time, or momentum change.

τ = rFsinθ — solve torque, lever arm, force, or angle.

α = Δω/Δt — solve for any variable.

I for spheres, disks, rods, and hoops from mass and radius.

Fc = mv²/r — solve force, mass, speed, or radius.

v_avg = Δx/Δt — solve for any variable.

a = Δv/t — solve for any variable.

v_t = √(2mg / (ρ·A·Cd)) — falling speed with drag.

v_esc = √(2GM/r) — leave a body’s gravity for good.

W = mg — compare your weight across the solar system.

η = output/input × 100% — from work or power.

W_net = ΔKE = ½m(v_f²−v_i²) — solve for any variable.

F_b = ρVg — float vs sink and submerged fraction.

P = F/A and P = ρgh — solve force, area, or fluid depth.

T = 2π√(L/g) — solve period, length, or gravity.

Q = mcΔT — solve heat energy, mass, specific heat, or ΔT.

F = k|q1q2|/r² — solve force, either charge, or distance.

R_total = R1 + R2 + ... plus current and voltage-divider drops.

P = V×I plus energy (kWh) and electricity cost.

n1 sinθ1 = n2 sinθ2 — solve for any variable, plus critical angle.

1/f = 1/do + 1/di — solve for focal length, object, or image distance.

c = Q/(mΔT) — find specific heat and identify unknown materials.

C = Q/V and C = ε₀εᵣA/d — solve capacitance, charge, voltage, or energy.

E = F/q and E = kQ/r² — solve field, force, charge, or distance.

f_obs = f_source×v_sound/(v_sound∓v_source) — approaching or receding source.

v = √(GM/r) — circular orbital speed for LEO, GEO, Moon, and Mars.

F = qvB sinθ and F = BIL sinθ — force on a charge or current-carrying wire.

x(t), v(t), a(t) for a mass-spring oscillator — solve any variable.

β = 10log₁₀(I/I₀) — intensity ⇄ decibels, plus the inverse-square law.

ΔL = αL₀ΔT — change in length from material and temperature swing.

P₁+½ρv₁²+ρgh₁ = P₂+½ρv₂²+ρgh₂ — solve pressure at a second point.

f = 1/T — period, frequency, angular frequency, and RPM.

1/f = 1/do + 1/di — image distance and magnification.

Remaining quantity after N half-lives.

Molar mass from chemical formula.

M = mol/L — solve for any variable.

PV=nRT — solve for any one variable.

P1V1/T1=P2V2/T2 — plus Boyle's and Charles's law modes.

pH from concentration or reverse.

C1V1=C2V2 — solve for any variable.

w/v, w/w and v/v percent — solve any variable.

Parts per million + ppm/%/ppb/mg-L conversions.

m = mol solute / kg solvent — solve any variable.

N = eq/L and N = M×n — solve any variable.

P1V1 = P2V2 — solve any variable, with a live 3D piston.

V1/T1 = V2/T2 — solve any variable, with a live 3D balloon.

P1/T1 = P2/T2 — solve any variable, at constant volume.

Balance equations up to 4 species instantly.

Find which reactant runs out first, plus excess.

Actual vs theoretical yield — solve any variable.

pOH = -log[OH-]; pH + pOH = 14 — solve any variable.

Calculate theoretical yield from stoichiometry.

Actual yield and yield-loss breakdown.

Empirical formula + molar mass → molecular formula.

Convert moles of one species to another via coefficients.

Simplest whole-number formula from mass percent.

pH = pKa + log([A-]/[HA]) — solve pH or the buffer ratio.

Mix acid + base, find moles H+ vs OH- and the excess.

MaVana = MbVbnb — solve for any variable.

Kc = [C]^c[D]^d / [A]^a[B]^b — up to 2 reactants and products.

rate = |ΔX| / (coefficient × Δt) — reactant or product.

N = n×N_A — moles to particles, or mass to particles.

Compare Q to Kc and predict reaction direction.

ΔH_rxn = ΣΔHf°products − ΣΔHf°reactants — up to 2 reactants and products.

q_water = mcΔT and q_reaction = −q_water — plus molar heat of reaction.

ΔS_rxn = ΣS°products − ΣS°reactants — up to 2 reactants and products.

Estimate [H+]/pH from Ka, or convert Ka ⇄ Kb (Ka×Kb=Kw).

P_total = P1+P2+P3+P4, or partial pressure from mole fraction.

ΔG = ΔH − TΔS — solve any variable, plus spontaneity.

ΔH_rxn ≈ Σ(bonds broken) − Σ(bonds formed) — up to 4 each.

E_cell = E°_cell − (0.0592/n)log(Q) at 25°C.

k = Ae^(-Ea/RT), or find Ea from two (T,k) points.

Protons, neutrons, electrons — plus weighted average atomic mass.

Protons, neutrons, and electrons from atomic number, mass number, and charge.

Aufbau-order configuration, noble-gas shorthand, and valence electrons.

E°cell = E°cathode − E°anode, plus Gibbs free energy and spontaneity.

m = (I×t×M)/(n×F) — mass deposited or dissolved during electrolysis.

ΔTb = i·Kb·m — how much a solute raises the boiling point.

ΔTf = i·Kf·m — how much a solute lowers the freezing point.

All 118 elements — click for atomic number, weight, and category.

Look up an element's standard atomic weight and proton/neutron count.

k = rate / ([A]^m[B]^n) — solve the rate constant from a rate law.

Raoult's law — vapor pressure lowering or a two-liquid mixture.

Build a monohybrid cross grid — genotype and phenotype ratios.

AaBb × AaBb — the classic 9:3:3:1 phenotype ratio.

p²+2pq+q²=1 — allele and genotype frequencies.

Both alleles shown fully and separately — roan cattle, AB blood type.

Blended phenotypes — pink flowers from red and white parents.

χ² = Σ(O-E)²/E — test if offspring match a predicted ratio.

RF% = recombinants/total × 100 — detect gene linkage.

X-linked inheritance — why sons and daughters differ.

Convert a DNA template strand into its mRNA transcript.

Translate mRNA codons into an amino acid chain.

GC% = (G+C)/total bases × 100.

Wallace rule — Tm = 4(G+C) + 2(A+T).

Find the reverse complement of a DNA strand.

Estimate annealing temperature from primer Tm.

SA:V = 6/s — why cells stay small.

N(t) = N₀e^(rt) — unconstrained population growth.

N(t) with a carrying capacity — the realistic S-curve model.

D = N/A — individuals per unit area.

H' = −Σ(pᵢ ln pᵢ) — measure community biodiversity.

v = Vmax[S]/(Km+[S]) — enzyme reaction velocity.

AaBbCc × AaBbCc — the 27:9:9:9:3:3:3:1 phenotype ratio.

Observed genotype and allele frequencies from population counts.

Watson-Crick pairing rules — DNA/RNA partner strands + H-bonds.

Tally codon frequency and reveal synonymous codon bias.

Scan a DNA sequence for EcoRI, BamHI, HindIII, and more.

A260 absorbance → ng/µL, plus A260/A280 purity ratio.

Total magnification = eyepiece × objective, plus field of view.

k = ln(Nt/N0)/t — exponential growth rate constant.

g = t/n — average generation time from population counts.

Per-step and cumulative dilution factor across a series.

Colony forming units from plate count and dilution.

Model lag, log, stationary, and death growth phases.

Energy transfer efficiency across trophic levels.

Lincoln-Petersen index — estimate wildlife population size.

Total biomass from population/density and average mass.

Predict water movement and cell outcome from tonicity.

Doubling time and PDL for mammalian cell culture.

r = ln(N/N0)/t — a clade's net diversification rate.

Chi-square test comparing observed vs. expected genotypes.

Allele frequency change over generations under selection.

Population cycles and equilibrium from the Lotka-Volterra model.

Sum residue masses from a protein sequence.

Composition, hydrophobicity, and charge from a sequence.

Model enzyme activity across a range of pH.

O2 output vs. light intensity, saturation curve.

Glucose oxidation stoichiometry and ATP yield.

Heterozygosity decay and simulated allele-frequency drift.

Identify prophase, metaphase, anaphase, or telophase.

Infer inheritance mode from a pedigree pattern.

Build a UPGMA tree from a binary character matrix.

Estimate how many gallons of paint you need for any room.

Area of a room or lot from length and width.

Perimeter of rectangles, circles, and triangles.

Cubic yards of concrete needed for a slab.

Concrete needed for flat slabs with waste buffer.

Tiles needed for a room from area and tile size.

Flooring material needed with estimated cost.

Bricks needed for a wall from dimensions.

Posts, rails, and panels for a fence run.

Decking boards and joists from dimensions.

Roofing squares and shingle bundles needed.

Cubic yards of gravel or sand for a area.

Cubic yards of mulch for garden beds.

Board feet from lumber dimensions.

Gallons in a pool from shape and depth.

Volume to cubic yards converter.

Drywall sheets needed for a room.

R-value coverage and rolls required.

Sod rolls needed for a lawn area.

Pavers needed for patio from area.

Number of steps, rise, and run from height.

Grout and concrete to core-fill a CMU block wall.

Concrete for round tube and pier footings.

Concrete for strip, pad, and column footings.

Concrete to pour solid steps by rise and run.

Bags of mortar and sand to lay block or brick.

Bags of thinset by area and trowel notch size.

Strength gained at any age from the curing curve.

Weight of steel, aluminum, and more by shape.

Rebar bars, length, and weight for a slab grid.

Studs and plate lumber for a wall by spacing.

Weight per foot of pipe by size and material.

Blocks, courses, and caps for a retaining wall.

Squares and boxes of siding from wall area.

Pounds and bags of grout by tile and joint size.

Riser, tread angle, and depth for a spiral stair.

AC tonnage from square footage and climate.

Furnace size from square footage and insulation.

Heat loss through a surface by R-value and ΔT.

Post count and hole depth below the frost line.

Gallons of stain by deck area and railing.

Rolls needed by wall size and pattern repeat.

Ramp length and landings at the ADA 1:12 slope.

Coop and run space per bird for a flock.

Pitch ratio, angle, and slope area factor.

Rafter length from run, pitch, and overhang.

Truss count from building length and spacing.

Roof snow load estimate from ground load & pitch.

Panels and linear feet by roof size and coverage.

Upper and lower rafter lengths for a barn roof.

Tons of asphalt from area and thickness.

Tons of crushed stone base under a driveway.

Gallons a tank holds by shape and dimensions.

Gallons in a pond from size and average depth.

Water flow in gallons per minute, two methods.

Water a pipe holds by bore and length.

Needed fire flow via the NFA fireground formula.

Area and depth into cubic yards of material.

Gallons to cover an area at a coverage rate.

Box weight and dimensional shipping weight.

Miter saw angle for corners and frames.

Miter and bevel for crown molding and slopes.

Grade %, angle, and ratio from rise and run.

Hole spacing and X-Y coordinates on a bolt circle.

Fence panels for a round pen by diameter.

How deep to countersink a flat-head screw flush.

Beam sag under load, checked against L/360.

Peak bending stress via the flexure formula.

Tightening torque for a target bolt clamp load.

Starting amperage and electrode size by thickness.

NEC box-fill volume check for wires and devices.

Header size for a load-bearing opening by span.

Max joist span by size and on-center spacing.

Recommended R-value by climate zone and area.

Blocks needed for a wall from length and height.

Concrete volume for round or square columns.

Total weight of a concrete pour by volume.

Bags of concrete to set a fence or deck post.

Battens and boards needed for a wall by spacing.

Gravel, pipe and fabric for a drainage trench.

Weight of a boulder or block by type and size.

Plate weight from dimensions and material.

ACH ventilation rate from room size and CFM.

Radius and arc length for a curved arch opening.

Boiler BTU output by square footage and climate.

Square yards of carpet needed, plus cost.

Material cost to build a shed by size and tier.

Epoxy needed for a pour by area and depth.

Zoning FAR and max buildable floor area.

Hoops and plastic sheeting for a greenhouse tunnel.

Safe ladder base distance using the 4-to-1 rule.

Bedding and jointing sand for a paver patio.

Plywood sheets needed to cover an area.

Shiplap boards needed, accounting for overlap.

Panels and trim needed for a wainscoted wall.

Rafter seat cut depth from pitch and plate width.

Cost to pour a concrete driveway by size and finish.

Surface gravel tonnage for a driveway top layer.

Flow rate in liters per minute, GPM or timed fill.

Max uniform load a beam can carry, strength limit.

Max beam span from section, load and tributary width.

Steel weldability from chemical composition (IIW).

Thread pitch, TPI and pitch diameter reference.

Rivet diameter and grip length from material stack.

Airflow from room ACH or duct size and velocity.

Convert women's and men's clothing sizes across US, UK, EU, and Asia.

Convert shoe sizes between US, UK, EU, and centimeters.

Find your ring size from finger circumference or diameter.

Find your hat size in US fitted, alpha, and centimeters.

Find the right belt size from your pants waist size.

Find your glove size in numeric and alpha sizing.

Find your sock size from your US shoe size.

Find the right sunglasses frame size from face width.

Find a child's clothing size from age, height, and weight.

Find your band and cup size from underbust and bust measurements.

Find your US dress size from bust, waist, and hip measurements.

Find your suit size — chest number plus Short/Regular/Long.

Find your body shape category from bust, waist, and hip.

Estimate or convert inseam length to a pant length category.

Add standard sewing ease to a body measurement for pattern fit.

Calculate fabric needed from piece size, quantity, and fabric width.

Calculate total fabric cost from yardage, price, and tax.

Convert fabric weight between GSM and ounces per square yard.

Calculate shrinkage percentage and how much extra fabric to buy.

Estimate lining fabric needed for a jacket, dress, skirt, or vest.

Estimate interfacing needed for collars, cuffs, and facings.

Calculate fabric and panel widths needed for gathered curtains.

Calculate binding strips and fabric needed from quilt dimensions.

Convert fabric length between yards, meters, inches, and cm.

Estimate fabric needed for a specific garment style and width.

Convert yarn thickness between denier, tex, and decitex.

Convert yarn thickness between English cotton count and denier.

Calculate fabric for a rectangular or round tablecloth.

Calculate fabric for a flat pillow cover or a box cushion.

Calculate fabric needed for a Roman blind from window size.

Calculate cut size from finished size and seam allowance.

Calculate continuous bias tape length from a fabric square.

Calculate elastic cut length from a body measurement.

Calculate zipper length needed for a garment opening.

Scale a pattern piece measurement between sizes.

Calculate waist radius and fabric for a circle skirt.

Calculate fabric width needed for a pleated skirt waist.

Estimate thread length needed from seam length and stitch type.

Convert stitch length between millimeters and stitches per inch.

Convert needle size between European and American numbering.

Calculate even buttonhole spacing along a placket.

Calculate buttonhole length from button diameter and thickness.

Calculate flat fabric needed for a gathered ruffle or waistband.

Calculate extra fabric needed for pleats on any project.

Calculate knit fabric stretch percentage from a 4-inch test.

Calculate a full or small bust pattern adjustment amount.

Calculate total trim needed for a production run.

Look up what a washing, bleaching, drying, or ironing symbol means.

Find the recommended wash, dry, and iron settings for any fabric.

Find the recommended shoelace length from eyelet pair count.

Calculate finished design size and fabric from stitch count.

Calculate fabric needed for a tote bag with gusset and handles.

Find the true cost of a garment per wear from price and wear count.

Build a full garment cost sheet from fabric, trims, CM, and overhead.

Calculate retail price from wholesale cost and target markup.

Convert fabric consumption per garment into a per-unit fabric cost.

Calculate retail price from wholesale cost using a keystone or custom multiplier.

Price a custom or made-to-order garment from materials, labor, and margin.

Estimate the cost of common tailoring and alteration jobs.

Calculate cut-make labor cost from SMV and cost-per-minute.

Estimate per-unit packaging and shipping cost for an apparel order.

Calculate how many garments a fabric bolt will yield.

Convert between profit margin and markup percentage instantly.

Build a one-page garment cost sheet from a short list of cost inputs.

Calculate fabric waste percentage and cutting overrun needed.

Calculate carton CBM and how many cartons fit a shipping container.

Find the sample size and accept/reject numbers for an AQL inspection.

Calculate standard allowed minutes and sewing line efficiency.

Scale ingredients by servings.

Cups, tbsp, tsp, ml conversions.

Volume to weight for baking ingredients.

Convert °F, °C, gas mark, fan.

Convert butter, flour, sugar amounts.

Water needed for rice by type.

Safe thawing time from food weight.

Roasting time from meat type and weight.

Active dry to instant yeast conversion.

Estimate real-world driving range from battery & efficiency.

Charge time from any % to any % at Level 1/2/DC speeds.

Cost to charge at home vs public stations.

Total cost comparison over years of ownership.

mi/kWh, Wh/mi, km/kWh from distance & energy used.

Estimate capacity loss and range fade over time.

Charge stops, time & cost for long-distance drives.

Breaker size, wire gauge & panel load for L1/L2 chargers.

Years to recoup the EV price premium from savings.

Energy recovered from braking based on speed & weight.

Emissions comparison between EV and gas vehicle.

Range reduction when towing a trailer or load.

Estimate when to replace battery and projected cost.

kW delivered, voltage, amps & charge rate for any EVSE.

Curb weight, GVWR, payload & battery weight impact.

Estimate the fuel cost of any trip from distance, efficiency, and price.

Compare tire sizes and see diameter, circumference, and speedometer error.

Calculate RPM at speed from gear ratio, final drive, and tire size.

Project a vehicle value over time with a standard depreciation curve.

Compare trailer weight against towing and payload capacity limits.

Compare EV and gas car costs to find your break-even mileage.

Miles per gallon from odometer readings.

d=s×t solved for any variable.

Displacement from bore and stroke.

AFR with stoichiometric reference.

Engine compression from cylinder volume.

Resize any image by dimensions or percentage — in your browser.

Reduce image file size with adjustable quality — 100% private.

Crop any image with a drag-select area — no upload needed.

Convert JPG, WebP, AVIF and other formats to PNG instantly.

Convert any image to JPEG with adjustable quality.

Convert images to modern WebP format — smaller & faster.

Convert images to next-gen AVIF format for best compression.

Encode any image as a Base64 data URI string.

Rotate images by 90°, 180°, 270° or any custom angle.

Flip images horizontally or vertically with one click.

Resize width or height while maintaining the aspect ratio.

Find a screen pixel density from resolution and size.

Check if two colors pass WCAG contrast ratios for accessibility.

Generate MD5 hashes for any text or string input.

Generate SHA-256 hashes for any text or string input.

Generate keyed-hash message authentication codes with any algorithm.

Generate random v4 UUIDs — one or many at once.

Test your password strength, crack time & character analysis.

Generate secure random tokens with custom length & charset.

Calculate CRC32 checksums for text or file integrity verification.

Encrypt or decrypt text with AES-256-CBC using a password.

Generate a 2048-bit RSA public/private key pair in PEM or JWK format.

Generate bcrypt hashes and verify plaintext against existing hashes.

Generate QR codes from any URL or text and download as PNG.

Calculate password strength in bits of entropy and estimated crack time.

Decode the contents of a Certificate Signing Request (PEM format).

Decode the details of an X.509 SSL/TLS certificate in PEM format.

Check how secure your numeric PIN is against common patterns and brute force.

Generate placeholder text in various lengths and formats.

Reverse text, reverse words or reverse sentences instantly.

Compare two texts and highlight the differences side-by-side.

Remove extra spaces, blank lines and special characters.

Flip text upside down using unicode characters.

Convert text to strikethrough, glitch and zalgo styles.

Count syllables in any English text or word.

Estimate reading time and speaking time for any text.

Check if any text reads the same forwards and backwards.

Convert text to subscript, superscript and small caps.

Analyze text for readability scores, word count, sentence stats, and issues.

Convert any text to a clean URL-friendly slug.

Generate acronyms from any phrase or set of words.

Generate formatted citations in APA, MLA, and Chicago styles.

Convert English text to Pig Latin with real-time translation.

Analyze keyword frequency and density in any text.

Generate a visual word cloud from any text.

Extract and analyze meta tags from pasted HTML source.

Generate robots.txt files from simple settings.

Generate XML sitemap from a list of URLs.

Count and analyze H1-H6, img alt, links in pasted HTML.

Remove tracking parameters from any URL.

Flesch-Kincaid, Gunning Fog & SMOG readability scores.

Extract most frequent words and phrases from text.

Validate H1 to H6 heading structure from pasted HTML.

Full-page SEO audit — content, technical, performance & accessibility scores.

Convert CSV data to JSON and back — bidirectional.

Convert between JSON and YAML formats instantly.

Convert between JSON and XML formats bidirectionally.

Convert text to binary and binary back to text.

Convert text to hexadecimal and hex back to text.

Encode or decode URLs and query parameters.

Encode or decode HTML entities in any text.

Convert text to Morse code and Morse code to text.

Convert characters to ASCII codes and back.

Escape or unescape special regex characters.

Convert paper GSM to thickness in mm and microns.

Convert between bit, byte, KB, MB, GB, TB.

Mbps to MB/s and more.

MPG to L/100km and km/L.

Add, subtract, multiply feet and inches.

Decimal inches to fraction.

Convert kilograms to pounds instantly, with a conversion table.

Convert pounds to kilograms instantly, with a conversion table.

Convert kilograms to stone instantly, with a conversion table.

Convert stone to kilograms instantly, with a conversion table.

Convert grams to ounces instantly, with a conversion table.

Convert ounces to grams instantly, with a conversion table.

Convert grams to pounds instantly, with a conversion table.

Convert pounds to grams instantly, with a conversion table.

Convert milligrams to grams instantly, with a conversion table.

Convert metric tons to kilograms instantly, with a conversion table.

Convert centimeters to inches instantly, with a conversion table.

Convert inches to centimeters instantly, with a conversion table.

Convert centimeters to feet instantly, with a conversion table.

Convert feet to centimeters instantly, with a conversion table.

Convert millimeters to inches instantly, with a conversion table.

Convert inches to millimeters instantly, with a conversion table.

Convert meters to feet instantly, with a conversion table.

Convert feet to meters instantly, with a conversion table.

Convert kilometers to miles instantly, with a conversion table.

Convert miles to kilometers instantly, with a conversion table.

Convert yards to meters instantly, with a conversion table.

Convert feet to inches instantly, with a conversion table.

Convert inches to feet instantly, with a conversion table.

Convert nautical miles to kilometers instantly, with a conversion table.

Convert degrees Celsius to degrees Fahrenheit instantly, with a conversion table.

Convert degrees Fahrenheit to degrees Celsius instantly, with a conversion table.

Convert degrees Celsius to Kelvin instantly, with a conversion table.

Convert Kelvin to degrees Celsius instantly, with a conversion table.

Convert liters to US gallons instantly, with a conversion table.

Convert US gallons to liters instantly, with a conversion table.

Convert milliliters to US fluid ounces instantly, with a conversion table.

Convert US fluid ounces to milliliters instantly, with a conversion table.

Convert US cups to milliliters instantly, with a conversion table.

Convert US quarts to liters instantly, with a conversion table.

Convert miles per hour to kilometers per hour instantly, with a conversion table.

Convert kilometers per hour to miles per hour instantly, with a conversion table.

Convert knots to miles per hour instantly, with a conversion table.

Convert pounds per square inch to bar instantly, with a conversion table.

Convert bar to pounds per square inch instantly, with a conversion table.

Convert between length units with from/to dropdowns.

Convert between weight units with from/to dropdowns.

Convert between area units with from/to dropdowns.

Convert between volume units with from/to dropdowns.

Convert between speed units with from/to dropdowns.

Convert between pressure units with from/to dropdowns.

Convert between energy units with from/to dropdowns.

Convert between power units with from/to dropdowns.

Convert between angle units with from/to dropdowns.

Spell any number out in English words, with decimals.

Turn numbers written in words into digits.

Convert a decimal into a simplified fraction.

Convert a fraction or mixed number into a decimal.

Convert between scientific notation and decimals.

Current time in multiple cities and timezones around the world.

Convert a date and time from one timezone to another.

Count down days, hours, minutes & seconds to any target date.

Precision stopwatch with lap time and split time recording.

Find the ISO week number for any date.

Day number, week number and days remaining in the year.

Calculate total work hours between start and end times with breaks.

Compare current times across multiple cities with a visual timeline.

Find overlapping available times across multiple timezones.

Add or subtract business days from any date.

Your exact age in seconds, minutes, hours, days and more.

Generate an embeddable countdown timer widget for any future date.

Find the moon phase for any date — new, quarter, gibbous, full moon.

Find your Western zodiac sign based on your birth date.

Find weekday for any date.

Create vertical bar charts from labels and values.

Create proportional pie charts from your data.

Create line charts from XY data points.

Compare multiple datasets side-by-side with grouped bars.

Create donut charts with percentage labels.

Create frequency distribution histograms from raw data.

Create a radial gauge chart for single value display.

Create 100% stacked bar charts showing composition.

Generate scatter plots from XY data points with trend lines.

Create radar/spider charts for multivariate data comparison.

Generate box-and-whisker plots from a list of numbers.

Calculate the 2.5% Zakat due on your savings, gold, silver and business assets.

Work out the Zakat due on gold by weight, karat and price.

Calculate the 2.5% Zakat due on silver by weight and price.

Find the gold and silver nisab thresholds for Zakat from current prices.

Estimate each heir’s Qur’anic share of an estate under Islamic inheritance law.

Convert any Hijri (Islamic) date to the Gregorian calendar.

Convert any Gregorian date to the Hijri (Islamic) calendar.

See today’s Hijri (Islamic) date, month name and year.

Find your age in Hijri (lunar) years, months and days.

Live countdown to the first day of Ramadan.

Live countdown to Eid al-Fitr and Eid al-Adha.

Count your dhikr with a digital tasbih that saves your progress.

Find the Qibla direction to the Kaaba from your location.

Browse and search the 99 Names of Allah with meanings.

Get today’s Suhoor (Sehri) and Iftar times for your city.

Calculate the 20% Khums due on your annual surplus.