BMR & Calorie Calculator
Estimate the calories your body uses at rest and during a typical day with the Mifflin–St Jeor BMR and TDEE formulas.
Your details
Estimated daily calories
How to use this calculator
- 1
Choose the sex constant used by the Mifflin–St Jeor equation and enter your age.
- 2
Enter your height, weight and usual activity level.
- 3
Review estimated BMR and total daily energy expenditure (TDEE), then use them as planning ranges rather than medical targets.
Understanding your results
Basal metabolic rate (BMR) estimates the energy your body uses at rest. This tool uses the Mifflin–St Jeor equation: 10 × weight (kg) + 6.25 × height (cm) − 5 × age, then adds a sex-specific constant. TDEE multiplies BMR by an activity factor to estimate daily calorie needs. These population formulas cannot account for every medical, hormonal or body-composition difference. You can compare weight and height with the BMI calculator or convert pounds with the weight converter.
Frequently asked questions
What is the difference between BMR and TDEE?
BMR estimates calories used at complete rest. TDEE multiplies BMR by an activity factor to estimate your total daily calorie use.
Which BMR formula does this calculator use?
It uses the Mifflin–St Jeor equation, a widely used population estimate based on weight, height, age and a sex-specific constant.
How accurate is a calorie-needs estimate?
It is a starting estimate, not a precise measurement. Actual needs vary with body composition, health, activity, sleep and other factors.
Should I eat exactly my TDEE result?
Not necessarily. Track trends and consult a registered dietitian or clinician before making significant dietary changes, especially if you have a medical condition.
Related calculators
Disclaimer
BMR and calorie results are population-based estimates, not medical or nutrition advice. Consult a qualified clinician or registered dietitian before making significant health or diet changes. Review our calculation methodology and full disclaimer.