BMR Calculator
Estimate your Basal Metabolic Rate — the calories your body burns at rest.
Inputs
BMR (calories/day at rest)
1,649
Step by step
Weight term: 10 × kg
10 × 70.00
= 700.00 kcal
Height term: 6.25 × cm
6.25 × 175.00
= 1,093.75 kcal
Age term: 5 × age
5 × 30
= 150.00 kcal
Apply sex constant (+ 5)
700.00 + 1,093.75 − 150.00 + 5
= 1,649 kcal/day
Male offset is +5 (Mifflin-St Jeor)
How it works
Your Basal Metabolic Rate is the number of calories your body needs to maintain basic functions at complete rest. It's calculated with the Mifflin-St Jeor equation, the current clinical standard.
Formulas
Mifflin-St Jeor — Male
BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + 5
- BMR
- Basal Metabolic Rate in kcal/day
- w
- Weight in kilograms
- h
- Height in centimetres
- a
- Age in years
Mifflin-St Jeor — Female
BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) − 161
- BMR
- Basal Metabolic Rate in kcal/day
- w
- Weight in kilograms
- h
- Height in centimetres
- a
- Age in years
This is an estimate and not medical advice. BMR varies with body composition and health status. Consult a healthcare professional before making dietary changes.
Frequently Asked Questions
How do I use my BMR?
Multiply it by an activity factor to estimate your total daily calorie needs (TDEE). Use our Calorie Needs calculator for that step.
Why Mifflin-St Jeor?
It's more accurate for modern populations than the older Harris-Benedict equation and is widely used by dietitians.