BMR Calculator
The Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions at rest, such as breathing and circulation.
| Age | years (15-80) |
| Gender | |
| Height | |
| Weight |
Result
Your BMR will appear here.
About BMR
This calculator uses the standard resting-calorie equation, which is widely considered one of the most accurate formulas for estimating BMR:
Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5
Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
Your actual daily calorie needs are higher than your BMR because of movement and activity. For daily calorie targets, use the Calorie Calculator.
How it works
BMR (Basal Metabolic Rate) estimates how many calories your body uses at rest to maintain basic functions.
Formula (commonly used standard equation)
- Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5
- Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161
Example
A 30-year-old, 70 kg, 175 cm man: BMR ≈ 1649 kcal/day (estimate).
Assumptions
- An estimate only; actual metabolism varies with body composition, hormones, health, and other factors.
General information only, not medical or nutrition advice.
How to use the BMR Calculator
It takes a few seconds, and every figure is calculated in your browser.
- Enter your age.
- Select your gender.
- Enter your height.
- Enter your weight.
- Press Calculate — the result appears in the dark panel beside the form.
- Use Copy, CSV, Share or Print under the result if you want to keep it.
BMR Calculator — frequently asked questions
What formula does the BMR Calculator use?
Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5 Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161
How does the BMR Calculator work?
BMR (Basal Metabolic Rate) estimates how many calories your body uses at rest to maintain basic functions.
What assumptions and limitations should I know about?
An estimate only; actual metabolism varies with body composition, hormones, health, and other factors.
Can you walk through a worked example?
A 30-year-old, 70 kg, 175 cm man: BMR ≈ 1649 kcal/day (estimate).
Last updated 10 November 2026 · Formula, worked example and assumptions are documented above, and every result is calculated in your browser.