BMR Calculator
Estimate your basal metabolic rate, the calories your body burns at rest, using the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle equation.
Independently verified for accuracy
- BMR
- 1780 kcal/day
Estimate your basal metabolic rate, the calories your body burns at complete rest, using your choice of three established equations. It is the starting point for anyone setting a calorie target for weight loss, maintenance, or gain.
How this is calculated
It computes BMR with the Mifflin-St Jeor equation, the revised Harris-Benedict equation, or the Katch-McArdle equation, the last of which works from lean body mass derived from your body-fat percentage.
How to use
- Choose a formula: Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle.
- Enter your sex, weight, height, and age (Katch-McArdle uses body-fat percentage instead).
- Read your basal metabolic rate in calories per day.
Examples
- Male, 80 kg, 180 cm, 30 yr, Mifflin:
1,780 kcal/day - Female, 60 kg, 165 cm, 30 yr, Harris:
1,383.68 kcal/day
FAQ
- What is BMR?
- Basal metabolic rate is the number of calories your body uses at complete rest to keep basic functions running, such as breathing and circulation. It is the largest part of daily calorie burn.
- Which formula should I use?
- Mifflin-St Jeor is the modern default and tends to be the most accurate for most people. Harris-Benedict is the older standard. Katch-McArdle is best if you know your body-fat percentage, since it works from lean mass.
- How do I turn BMR into daily calories?
- Multiply BMR by an activity factor to get total daily energy expenditure (TDEE). Our TDEE calculator does this step for you.