BMR Calculator
Estimate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor equation, based on your weight, height, age, and sex.
- Free to use
- No registration required
- Works on all devices
- Last updated
- 13-09-2026
Your result
1,618 kcal/day
Basal Metabolic Rate (BMR)
AI explanation
Formula
Men: BMR = 10×weight + 6.25×height − 5×age + 5. Women: BMR = 10×weight + 6.25×height − 5×age − 161Worked example
Male, 75kg, 175cm, age 30
| Field | Value |
|---|---|
| Weight | 75 |
| Height | 175 |
| Age | 30 |
| Sex | male |
| Activity level | sedentary |
| Basal Metabolic Rate (BMR) | 1699 |
Assumptions
- Uses the Mifflin-St Jeor equation, widely regarded as more accurate than the older Harris-Benedict equation for most adults.
Frequently asked questions
What is BMR?
Basal Metabolic Rate is the number of calories your body burns at complete rest just to maintain basic functions like breathing, circulation, and cell production.
How is BMR different from TDEE?
BMR is calories burned at rest. TDEE adds your activity level on top of BMR to estimate total daily calorie needs — see the TDEE Calculator.
Why does BMR decrease with age?
Lean muscle mass tends to decrease with age, and muscle burns more calories at rest than fat, so BMR typically declines gradually after early adulthood.
Why does the calculator ask for activity level if it's about "rest"?
Activity level only affects the secondary TDEE figure shown alongside your BMR, for reference — it doesn't change the BMR calculation itself.
Can I increase my BMR?
Building lean muscle mass through strength training is the most reliable way to raise BMR over time, since muscle burns more calories at rest than fat tissue.
Related calculators
Related articles
Sources
- A new predictive equation for resting energy expenditure in healthy individuals (Mifflin-St Jeor) — American Journal of Clinical Nutrition. Effective 01-02-1990, checked 13-09-2026.
This calculator provides a general estimate only and does not constitute personalized medical, nutritional, or fitness advice. Consult a qualified healthcare professional or registered dietitian before making significant changes to your diet.
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