BMR Calculator — Mifflin-St Jeor Formula
By Punit Bharadwaj
•
June 2026
Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at complete rest. Knowing your BMR is the foundation for any calorie-based diet plan.
How to Use BMR Calculator
1.
Enter your age, weight, and height2.
Select your gender3.
View your BMR in calories per day4.
Multiply by activity factor for total daily needs
Key Features
- Uses the accurate Mifflin-St Jeor equation
- Separate formulas for male and female
- Shows BMR and suggested activity multipliers
- Helps set calorie deficit/surplus targets
When to Use This Tool
•
Starting a weight loss plan•
Understanding your baseline calorie needs•
Calculating macros for fitness goals•
Comparing metabolism at different ages
Frequently Asked Questions
For men: BMR = 10×weight(kg) + 6.25×height(cm) - 5×age - 5. For women: same but -161 instead of -5.
BMR is calories at complete rest. TDEE (Total Daily Energy Expenditure) includes all physical activity on top of BMR.
Yes — this tool uses the Mifflin-St Jeor equation specifically, which is generally considered more accurate than the older Harris-Benedict formula.
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