🔥 BMR Calculator
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions — breathing, circulation, cell production — while at complete rest. It represents the minimum energy requirement just to stay alive.
BMR Formulas
| Formula | Published | Notes |
|---|---|---|
| Mifflin-St Jeor | 1990 | Most accurate for modern populations |
| Harris-Benedict | 1919 (revised 1984) | Older, slightly overestimates |
| Katch-McArdle | 1975 | Uses lean body mass |
⚠️ BMR is an estimate. Individual metabolism varies based on genetics, muscle mass, hormones, and health status.
Frequently Asked Questions
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions at complete rest — breathing, circulation, cell production, and temperature regulation. It's the minimum energy needed to stay alive.
This calculator uses the Mifflin-St Jeor equation, considered the most accurate for most adults: Men: BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5. Women: BMR = (10 × kg) + (6.25 × cm) − (5 × age) − 161.
BMR is calories burned at complete rest. TDEE (Total Daily Energy Expenditure) is your actual daily calorie burn including all activity — exercise, walking, even fidgeting. TDEE = BMR × activity multiplier. Most people's TDEE is 1.2–1.9× their BMR.
Yes, significantly. Muscle tissue burns more calories at rest than fat tissue. This is why strength training can boost your BMR over time — more muscle means higher resting calorie burn, making weight management easier.
To lose weight, consume fewer calories than your TDEE. A deficit of 500 calories/day leads to roughly 0.5kg (1lb) of weight loss per week. Never go below your BMR for extended periods without medical supervision — it can slow metabolism and cause muscle loss.