⚡ BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest — and see your TDEE at every activity level.
Your Details
Your Result
| Activity Level | TDEE (cal/day) |
|---|---|
| Sedentary (little/no exercise) | – |
| Light (1-3 days/week) | – |
| Moderate (3-5 days/week) | – |
| Active (6-7 days/week) | – |
| Very Active (hard exercise) | – |
This is an estimate for informational purposes only, not medical advice. Consult a doctor or dietitian for personalized guidance.
How the BMR Calculator Works
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic life functions like breathing, circulation, and cell production while at complete rest. This calculator offers three well-known formulas.
Formulas
Mifflin-St Jeor — Women: BMR = 10×kg + 6.25×cm − 5×age − 161
Harris-Benedict — Men: BMR = 88.362 + 13.397×kg + 4.799×cm − 5.677×age
Harris-Benedict — Women: BMR = 447.593 + 9.247×kg + 3.098×cm − 4.330×age
Katch-McArdle: BMR = 370 + 21.6 × lean mass (kg), where lean mass = weight × (1 − body fat% / 100)
This tool provides general estimates for informational purposes only and is not medical advice. Consult a doctor or registered dietitian for personalized guidance.
Frequently Asked Questions
Which BMR formula is most accurate?
Mifflin-St Jeor is generally considered the most accurate for the general population. Katch-McArdle can be more precise if you know your body fat percentage, since it accounts for lean body mass.
What is the difference between BMR and TDEE?
BMR is calories burned at complete rest. TDEE multiplies BMR by an activity factor to estimate total calories burned in a full day, including exercise and daily movement.
Does BMR change over time?
Yes. BMR naturally declines with age and can change with shifts in muscle mass, weight, and hormonal factors.