About the calorie calculator
This calculator estimates basal metabolic rate (BMR) with the Mifflin–St Jeor equation, then multiplies it by an activity factor to estimate total daily energy expenditure. Treat the result as a starting point: individual metabolism varies, and medical conditions and medications can change needs.
How to use this calculator
- Enter age, sex, height, and weight.
- Choose the activity level that best matches a typical week.
- Read your estimated BMR and maintenance calories.
Worked examples
- 180 cm, 80 kg
- BMR = 800 + 1,125 − 150 + 5 = 1,780 kcal
- Moderate activity × 1.55
About 2,760 kcal per day.
Measurement guidance
Choosing activity level
Pick the level that matches an average week, not your most active one.
Frequently asked questions
How accurate is this?
It’s an estimate. Real needs can differ noticeably between individuals.
Should I eat this many calories?
That depends on your goals and health. A doctor or registered dietitian can give personal guidance.
Is this medical advice?
No.