Complete BMR Calculator
Calculate your Basal Metabolic Rate using three major formulas and compare results
Biological sex affects metabolic rate calculations
Age impacts metabolic rate
Switch between imperial and metric
Optional: Required only for Katch-McArdle formula
Your typical weekly exercise routine
Mifflin-St Jeor Formula
BMR (Resting)
1685 cal/day
TDEE (Total Daily)
2022 cal/day
Most accurate for general population
Harris-Benedict Formula
BMR (Resting)
1712 cal/day
TDEE (Total Daily)
2054 cal/day
Classic formula, slightly higher estimates
Katch-McArdle Formula
BMR (Resting)
1798 cal/day
TDEE (Total Daily)
2158 cal/day
Most accurate for lean/athletic individuals
Formula Comparison
| Formula | BMR | TDEE | Best For |
|---|---|---|---|
| Mifflin-St Jeor | 1,685 | 2,022 | General population |
| Harris-Benedict | 1,712 | 2,054 | Traditional method |
| Katch-McArdle | 1,798 | 2,158 | Athletic/lean body |
Understanding Your Results
BMR vs TDEE
- BMR (Basal Metabolic Rate): Calories burned at complete rest
- TDEE (Total Daily Energy Expenditure): BMR × activity factor
- For weight loss: Eat below TDEE but above BMR
- For weight gain: Eat above TDEE
Which Formula to Use?
- Mifflin-St Jeor: Most accurate for average body composition
- Harris-Benedict: Older formula, tends to overestimate
- Katch-McArdle: Best if you know your body fat percentage