Health
BMR calculator
Basal metabolic rate is the energy your body uses at complete rest. This page uses the Mifflin-St Jeor equation, a widely used estimate for adults.
What this means
- At rest your body uses about 1,712 calories a day.
- Daily needs are higher once activity is added. The TDEE calculator multiplies BMR by an activity level.
- Equations are averages. Individual results can differ.
What if
About this calculator
What this calculator does
It estimates resting energy use from weight, height, age, and sex using the Mifflin-St Jeor equation (Mifflin and others, 1990). The page uses the simplified form published in the same paper, with whole-number weight and height coefficients.
How it is calculated
men: BMR = 10 * kg + 6.25 * cm - 5 * age + 5
women: BMR = 10 * kg + 6.25 * cm - 5 * age - 161
How to read the result
The result is calories (kcal) per day if you did nothing at all. It is a starting point for estimating daily needs, not a target.
Sources and method
The simplified Mifflin-St Jeor equation published in the 1990 paper.
Questions
What is the difference between BMR and TDEE?
BMR is energy at rest. TDEE adds activity, so it is always higher.
Why Mifflin-St Jeor?
It is one of the most widely used BMR equations for adults.
Is it accurate for athletes?
Less so. Body composition matters, and muscular people often burn more than the equation shows.
Can I use it for children?
No. This page is for adults 18 and older.