This BMR calculator estimates basal metabolic rate, the calories your body may burn at rest based on common predictive equations.
Health
BMR Calculator (Basal Metabolic Rate, Mifflin St Jeor Equation)
Estimate resting daily energy needs with the Mifflin-St Jeor equation.
Calculator
About this calculator
Formula notes
Popular approaches include Mifflin-St Jeor and similar formulas that combine weight, height, age, and sex.
Worked examples
- Example: a 30-year-old male at 70 kg and 175 cm gets a Mifflin-St Jeor BMR of about 1649 kcal per day.
- For a 40-year-old woman at 65 kg and 165 cm, Mifflin-St Jeor estimates BMR near 1,320 kcal/day before any activity factor is applied.
How to use it
- Enter age, sex, height, and weight.
- Review the resting calorie estimate.
- Use it as a baseline before activity adjustments.
Frequently asked questions
Is BMR the same as TDEE?
No. BMR is a resting estimate. TDEE also accounts for daily activity.
Can BMR be measured directly?
Resting energy expenditure can be measured with indirect calorimetry under controlled conditions; equations only predict it from body data.
Limits and interpretation
- Predictive equations estimate population averages and can differ from indirect calorimetry for an individual.
- Illness, pregnancy, growth, medications, body composition, and extreme body sizes can reduce applicability.