Estimate your Basal Metabolic Rate — the calories your body burns at complete rest — with the Mifflin-St Jeor equation. Enter your details below — the calculation runs entirely in your browser.
Frequently asked questions
What is BMR?
Basal Metabolic Rate is the energy your body needs at complete rest to maintain basic functions like breathing, circulation, and cell repair. It typically accounts for the largest share of your daily calorie burn.
Which equation does this calculator use?
The Mifflin-St Jeor equation, which research suggests is more accurate for modern populations than the older Harris-Benedict equation. The Harris-Benedict estimate is shown alongside it for comparison.
How is BMR different from TDEE?
BMR is rest-only energy use. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor to estimate real-world daily burn. Use our TDEE calculator for that next step.
This calculator provides estimates for informational and educational purposes only. It is not medical advice and does not diagnose or treat any condition. Consult a qualified healthcare professional before starting any diet, exercise, or weight-management program.