Basal Metabolic Rate is the number of calories your body burns at complete rest just to keep basic functions running — breathing, circulation, cell production — with no activity factored in.

How is BMR calculated here?

This tool uses the Mifflin-St Jeor equation, widely considered one of the more accurate formulas for most people: 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.

What's the difference between BMR and TDEE?

TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor that accounts for exercise and daily movement — it estimates how many calories you actually burn in a day, which is the more useful number for setting a calorie target.

Is my data sent anywhere?

No. The calculation happens locally in your browser and nothing you enter is transmitted or stored.

BMR CALCULATOR

Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure with the Mifflin-St Jeor formula. Nothing leaves your browser.

Age (years)

Height (cm)

Weight (kg)

Activity level

BMR (calories/day at rest)1,649

TDEE (calories/day with activity)2,267

How to calculate your BMR

1
Choose metric (cm / kg) or imperial (ft, in / lb) units.
2
Enter your sex, age, height, weight, and activity level.
3
Read your BMR and TDEE instantly — they update as you type.

Questions

What is BMR?: Basal Metabolic Rate is the number of calories your body burns at complete rest just to keep basic functions running — breathing, circulation, cell production — with no activity factored in.
How is BMR calculated here?: This tool uses the Mifflin-St Jeor equation, widely considered one of the more accurate formulas for most people: 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.
What's the difference between BMR and TDEE?: TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor that accounts for exercise and daily movement — it estimates how many calories you actually burn in a day, which is the more useful number for setting a calorie target.
Is my data sent anywhere?: No. The calculation happens locally in your browser and nothing you enter is transmitted or stored.