BMR Calculator
Estimate your basal metabolic rate (resting calorie burn) with the Mifflin-St Jeor equation — the starting point for weight loss or weight gain plans.
Advanced inputs+
How this works
Uses Mifflin-St Jeor: 10 x kg + 6.25 x cm - 5 x age + 5 for men or -161 for women.
Medical disclaimer
Educational tool only — not medical advice. Consult a qualified provider.
Frequently asked questions
What is BMR and how is it used for weight gain or loss?+
Basal metabolic rate (BMR) is the energy your body uses at rest to keep basic functions running. It is the starting point for calorie planning: multiply BMR by an activity factor to get maintenance calories (TDEE), then eat above that range for weight gain or below it for weight loss. BMR itself does not include activity. This is a planning estimate, not medical advice.
What does the BMR Calculator estimate?+
It estimates resting calorie burn from age, sex, height, and weight. The result is a planning estimate, not a diagnosis or personal medical advice.
How accurate is this BMR result?+
Accuracy depends on the inputs and the limits of the formula. Use the result as a reference point and compare it with real-world outcomes over time.
Can I share my result?+
Yes. Change the inputs, use the copy-link button, and the current values are preserved in the URL for reopening or sharing.
Will my last input be remembered?+
Yes. The calculator saves the latest inputs in this browser so a reload can restore the most recent values.
Should I use this for medical decisions?+
No. These calculators are educational tools. Talk with a qualified clinician before making health, pregnancy, nutrition, or training decisions.