BMR Calculator
Resting calorie burn sketch (Mifflin–St Jeor) from body stats — not a lab metabolic cart. Click any i for detail.
Body stats
Sex
i
Sex
Used in the Mifflin–St Jeor constants. |
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Age (years)
i
Age
Adult equation — not for young children. |
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Weight (lb)
i
Weight
Current body weight in pounds. |
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Height (in)
i
Height
Height in inches (5′6″ = 66). |
How to use this calculator
- Select sex and enter age, weight, and height.
- Read kcal/day at rest (Mifflin–St Jeor).
- Pair with the TDEE page when you want activity multipliers.
Results explained
Basal metabolic rate is a resting burn estimate before exercise and NEAT. Mifflin–St Jeor is a widely used adult equation: 10×kg + 6.25×cm − 5×age + 5 (male) or −161 (female). Muscle mass, hormones, illness, and measurement error move the true number; treat the output as a starting point for meal planning, not a medical metabolism diagnosis.
Quick reference: BMR
Mifflin–St Jeor in metric units, then shown as kcal/day.
| Item | Detail |
|---|---|
| Male | 10·kg + 6.25·cm − 5·age + 5 |
| Female | 10·kg + 6.25·cm − 5·age − 161 |
| TDEE cousin | Multiply BMR by an activity factor |
| Not included | Thermic effect of food as a separate line |
Educational estimate — not a prescription for under-eating.
How the estimate is built
BMR = 10·kg + 6.25·cm − 5·age + s, where s = +5 (male) or −161 (female).
Example scenario
Female, 30y, 150 lb, 66 in → about 1,400 kcal/day BMR (rounded).
FAQ
Is BMR the same as TDEE?
No. BMR is resting. TDEE multiplies by activity to estimate maintenance calories across a normal day.
Should I eat exactly my BMR?
Usually no. Even sedentary days include some movement. Severe deficits need professional supervision.
Why not Harris–Benedict?
Mifflin–St Jeor tends to fit modern adult samples better. Cross-check with another formula if your coach prefers it.
Does body fat change BMR?
Yes in reality; this equation only uses sex, age, height, and weight. Two people with the same stats can differ.