🔥 BMR Calculator
Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to maintain basic functions. Enter your weight, height, age, and sex to calculate it.
Basal Metabolic Rate — calories burned at rest (Mifflin-St Jeor).
How the BMR Calculator works
This calculator uses the Mifflin-St Jeor equation, widely regarded as one of the most accurate BMR formulas available for general use.
Step-by-step calculation
- 1Enter age, sex, height and weight.
- 2Apply the Mifflin-St Jeor equation.
Worked example
A 30-year-old man, 80 kg, 180 cm: 800 + 1,125 − 150 + 5 = 1,780 calories a day at rest.
BMR Calculator examples
| Weight (kg) | BMR |
|---|---|
| 35 | 1,299 calories/day at rest |
| 53 | 1,479 calories/day at rest |
| 70 | 1,649 calories/day at rest |
| 88 | 1,829 calories/day at rest |
| 105 | 1,999 calories/day at rest |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a BMR Calculator?
Know how many calories your body burns at rest.
Important factors that can affect your results
- Muscle mass.
- Age.
- Thyroid and other health factors.
Frequently asked questions
What's the difference between BMR and daily calorie needs?
BMR is calories burned at complete rest; total daily calorie needs add activity level on top of that — see the Calorie Needs calculator.
How accurate is the Mifflin-St Jeor equation?
It's considered one of the more accurate general-population BMR formulas, though individual metabolism varies.
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Last reviewed November 2026 · How we build and check our tools · Report a problem