Calorie Calculator
Enter your details and activity level to estimate your daily calorie needs for maintaining, losing or gaining weight.
Reviewed by the ToolNestr Editorial Team — July 2026
Fill in your details to see your daily calories.
About this calorie calculator
Knowing roughly how many calories you need each day is the starting point for any nutrition or weight goal. This calculator estimates your maintenance calories from your body details and activity level, then shows targets for losing or gaining weight at a steady, sustainable pace. Use it alongside our BMR Calculator and BMI Calculator.
⚕️ For general information only — not medical or dietary advice. Consult a professional before major diet changes.
When to use this tool
Use the Calorie Calculator whenever you’re starting a new nutrition plan or adjusting an existing one. It’s especially helpful before beginning a weight-loss or muscle-gain phase, so you know your target intake from day one. Athletes use it to fuel training sessions, and anyone transitioning to a more (or less) active lifestyle can reset their daily targets to match their new routine.
Tips for best results
- Be honest about your activity level — overestimating it leads to calorie targets that are too high for weight loss.
- Track your actual intake for a week with a food diary and compare it to the calculator’s target; adjust by 100–200 calories if your weight isn’t moving as expected.
- Re-calculate every 5–10 kg (10–20 lb) of weight change, since your BMR shifts as your body weight changes.
What different calorie ranges mean
Your total daily energy needs depend on how active you are. The bars below show approximate daily calorie ranges for a moderately active 30-year-old at different activity levels.
Weight-loss planner
Set a safe, sustainable calorie deficit based on your real maintenance needs instead of guessing or following generic diet templates.
Muscle builder
Know exactly how many calories above maintenance you need to fuel muscle growth without gaining excessive fat during a bulk.
Endurance athlete
Match your high daily calorie burn with adequate fuel to maintain performance, recover properly and avoid energy deficiency.
Health-focused parent
Understand your family's broad energy needs to plan balanced meals, manage portions and model healthy eating habits at home.
| Activity level | Male (70 kg, 30 yrs) | Female (60 kg, 30 yrs) |
|---|---|---|
| Sedentary | ~2,100 cal/day | ~1,700 cal/day |
| Lightly active | ~2,400 cal/day | ~1,950 cal/day |
| Moderately active | ~2,700 cal/day | ~2,200 cal/day |
| Very active | ~3,000 cal/day | ~2,450 cal/day |
| Extra active | ~3,300 cal/day | ~2,700 cal/day |
How calorie needs are calculated
Your daily calorie needs are estimated in two steps. First, your Basal Metabolic Rate (BMR) is calculated using the Mifflin-St Jeor equation. Second, your BMR is multiplied by an activity factor (1.2–1.9) that reflects your typical exercise level to give your Total Daily Energy Expenditure (TDEE).
TDEE = BMR × activity multiplier
For weight loss: TDEE − 500 calories (≈0.45 kg / week)
For weight gain: TDEE + 500 calories (≈0.45 kg / week)
The 500-calorie adjustment is based on the well-established rule that roughly 3,500 calories equals 0.45 kg (1 lb) of body fat. Individual results vary with metabolism, adherence and body composition changes.
Worked example
A 28-year-old man who is 180 cm tall, weighs 82 kg, and exercises 4 days per week (moderately active) wants to know his calorie targets.
How to use the Calorie Calculator
Enter your body details
Provide your age, sex, height and weight in either metric or imperial units. These are used to calculate your BMR as the baseline.
Select your activity level
Choose the option that best matches your typical weekly exercise routine. Be honest — overestimating leads to targets that are too high.
Read your calorie targets
See your maintenance, weight loss and weight gain targets. Use the loss or gain figure as your daily guide for steady progress.
Tips for accurate calorie tracking
Track your actual intake
Use a food diary or app for a week. Compare your real intake to the calculator's target and adjust by 100–200 calories if your weight isn't moving as expected.
Recalculate after weight changes
Every 5–10 kg (10–20 lb) of weight change shifts your BMR and therefore your maintenance calories. Re-run the calculator to keep your targets accurate.
Don't cut too aggressively
Dropping too far below maintenance (more than 500–750 calories) can trigger metabolic slowdown, muscle loss and nutrient deficiencies. Slow and steady wins the race.
Frequently asked questions
How are my calorie needs calculated?
We calculate your BMR with the Mifflin-St Jeor equation, then multiply by an activity factor to estimate your maintenance calories. Losing or gaining uses a 500-calorie daily change (about 0.45 kg / 1 lb per week).
How many calories should I cut to lose weight?
A common target is 500 calories below maintenance for roughly 0.45 kg (1 lb) of loss per week. Avoid going too low — it’s often unsustainable and unhealthy.
Are these numbers exact?
They’re solid estimates. Real needs vary with genetics, muscle mass and other factors, so adjust based on real-world results.
What happens if I eat too few calories?
Dropping below about 1,200 calories per day for women or 1,500 for men can slow your metabolism, cause muscle loss and lead to nutrient deficiencies. A moderate deficit is safer and more sustainable.
Do men and women need different calories?
Yes — men generally have more muscle mass and a higher BMR, so they need more calories at the same activity level. This calculator accounts for sex in the BMR equation.
Should I eat back the calories I burn through exercise?
Only if your goal is weight maintenance. If you’re trying to lose weight, your activity level setting already accounts for exercise — eating back extra calories may cancel the deficit.
How do macronutrients affect my calorie needs?
Your calorie target is about quantity, but macronutrient balance (protein, carbs, fat) affects body composition. Higher protein supports muscle retention during weight loss, while fats and carbs fuel energy needs.
Should I eat the same calories every day?
Consistency helps, but daily variation of 100–200 calories is normal and fine. What matters most is the weekly average, not hitting the exact number every single day.
How does sleep affect calorie needs?
Poor sleep can lower your BMR and increase appetite hormones, making weight management harder. Prioritising 7–8 hours of quality sleep supports your calorie goals.
Do I need more calories when I’m sick or injured?
Yes — your body burns extra energy healing itself. Eating at or slightly above maintenance during illness or recovery helps support your immune system and tissue repair.