Calorie Calculators
Calorie Calculator
Enter your sex, age, weight, height, and activity level and CalorieLab estimates your daily calorie needs using the Mifflin-St Jeor equation, then adjusts the target for maintaining, losing, or gaining.
Daily calorie needs estimate
Estimated daily calorie target
2,662kcal/day
How the estimate breaks down
Calories are estimated with the Mifflin-St Jeor equation scaled by an activity factor (TDEE), then adjusted for your goal — lose subtracts 500 kcal/day, gain adds 300 kcal/day. This is a screening estimate, not medical, nutritional, or dietary advice. Consult a qualified professional before changing your diet. Everything runs in your browser; nothing is uploaded.
About this calculator
A free daily calorie calculator that estimates how many calories your body uses in a day. It computes your resting metabolic rate (BMR) with the Mifflin-St Jeor equation, scales it by an activity multiplier to a Total Daily Energy Expenditure (TDEE), then adjusts that number for your goal — maintenance keeps you level, weight loss subtracts about 500 calories a day, and muscle gain adds about 300. Everything runs in your browser, no account or upload required. The result is a general screening estimate, not medical, nutritional, or dietary advice; individual needs vary with body composition, health, and medication, so consult a qualified professional before changing your diet.
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Questions
- How does the calorie calculator work?
- It uses the Mifflin-St Jeor equation to estimate your basal metabolic rate from sex, age, weight, and height, multiplies that by a standard activity factor to get your TDEE, then applies a calorie offset for your goal. It is a widely used screening formula, not a measurement of your actual metabolism.
- Is this medical or dietary advice?
- No. The numbers are a general estimate for planning purposes only and are not medical, nutritional, or dietary advice. Calorie needs vary with body composition, health conditions, pregnancy, and medication, so consult a doctor or registered dietitian before changing what you eat.
- Why do weight-loss and muscle-gain targets differ from maintenance?
- Maintenance is your estimated TDEE. To lose weight the tool subtracts about 500 calories a day, a moderate deficit of roughly half a kilogram a week; to gain muscle it adds about 300 calories a day, a lean surplus meant to limit excess fat gain. These offsets are conservative defaults, not personalized prescriptions.
- Is the calculator free and private?
- Yes. It is free, needs no account, and runs entirely in your browser — none of the figures you enter are uploaded or stored.