BMR Calculator

Calculate your Basal Metabolic Rate (BMR) to estimate baseline calorie consumption.

About the BMR Calculator

Basal Metabolic Rate (BMR) estimates how many calories your body burns at rest just to maintain basic functions.

How to use the BMR Calculator

Enter your age, sex, weight, and height.
Select the BMR estimation method you want to use.
If using Katch-McArdle, enter your body fat percentage.
Press Calculate to see your estimated BMR.

Tips for the BMR Calculator

Multiply BMR by an activity factor to estimate your total daily calorie needs.
Mifflin-St Jeor is generally considered the most accurate method for most people without precise body fat measurements.
Katch-McArdle is ideal if you know your exact body fat percentage since it bases calculation on lean body mass.

Formula used by the BMR Calculator

Mifflin-St Jeor Equation:
For men:
BMR = 10W + 6.25H - 5A + 5
For women:
BMR = 10W + 6.25H - 5A - 161

Revised Harris-Benedict Equation:
For men:
BMR = 13.397W + 4.799H - 5.677A + 88.362
For women:
BMR = 9.247W + 3.098H - 4.330A + 447.593

Katch-McArdle Formula:
BMR = 370 + 21.6(1 - F)W

where:
W is body weight in kg
H is body height in cm
A is age
F is body fat in percentage (expressed as a fraction, e.g. 20% = 0.20)

Example: BMR Calculator

A 30-year-old man, 70 kg and 175 cm tall, using Mifflin-St Jeor

Age / sex: 30 / male
Weight / height: 70 kg / 175 cm
Method: Mifflin-St Jeor

Result: BMR ≈ 1,649 calories/day

BMR = 10(70) + 6.25(175) − 5(30) + 5 = 700 + 1,093.75 − 150 + 5 = 1,648.75, rounded to 1,649 calories burned at rest per day.