BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the number of calories your body burns at complete rest. The foundation for calculating your TDEE and calorie targets.
Part of our Health Calculators collection.
BMR Calculator
Free online calculator
How to Use This Calculator
- 1
Enter your age, sex, weight, and height.
- 2
See your BMR instantly.
- 3
Use the TDEE calculator to add your activity level on top.
BMR Formula (Mifflin-St Jeor)
Male BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5 Female BMR = (10 × kg) + (6.25 × cm) − (5 × age) − 161 This is the most accurate widely-used formula. Your BMR is the calories needed just to keep your body functioning — breathing, circulation, organ function — with zero activity.
Example Calculation
Example: 30-year-old male, 175 lbs, 5'10"
Inputs
age: 30sex: maleweightLbs: 175heightFt: 5heightIn: 10
Result
BMR: 1,836 calories/day
This person burns 1,836 calories per day at complete rest. Any activity increases this number.
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR is calories burned at complete rest. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor — sedentary to extra active — to estimate real daily calorie needs.
Can I eat only my BMR calories?
Not recommended. BMR is the bare minimum for organ function. Consistently eating only BMR calories without medical supervision can cause muscle loss and metabolic adaptation.