BMR Calculator
Calculate your Basal Metabolic Rate (BMR), an estimate of how many calories your body burns just to maintain basic functions at rest.
About this bmr calculator
BMR is the foundation most calorie and diet planning starts from, it is the energy your body needs just to breathe, circulate blood, and keep organs running, before any activity is added.
How bmr calculator works
This uses the Mifflin-St Jeor equation: for men, BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5; for women, BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161.
Common uses
- Establishing a baseline for a calorie-counting diet plan
- Understanding how many calories your body needs at minimum
- Combining with activity level to estimate total daily calorie needs
How to use this tool
- Enter your weight, height, and age.
- Select your sex.
- See your estimated BMR instantly.
What to know before using it
This is a population-average formula and an estimate, individual metabolism varies. It is a general wellness figure, not medical advice.
Privacy and browser-first processing
This tool runs entirely in your browser using JavaScript. Nothing you enter is uploaded or stored.
Frequently asked questions
What is BMR used for?
It is typically used as a baseline, then multiplied by an activity factor to estimate total daily calorie needs for weight maintenance, loss, or gain.
Which formula does this calculator use?
The Mifflin-St Jeor equation, widely considered one of the more accurate standard formulas for estimating BMR.