Harris-Benedict BMR Calculator

Estimate basal metabolic rate using the Harris-Benedict equations for men and women.

991.1K uses Updated · 2026-05-25 Runs locally · zero upload
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How to Use Harris-Benedict BMR Calculator

  1. Select male or female because the Harris-Benedict equation uses different constants by sex.
  2. Enter weight in kilograms and height in centimeters.
  3. Enter age in years. Age reduces the estimate because resting energy expenditure generally declines over time.
  4. Use the result as estimated resting energy needs before adding activity, exercise, and digestion.

Formula & Theory - Harris-Benedict BMR Calculator

Men:   BMR = 88.362 + 13.397 x weight(kg) + 4.799 x height(cm) - 5.677 x age
Women: BMR = 447.593 + 9.247 x weight(kg) + 3.098 x height(cm) - 4.330 x age

Use Cases for Harris-Benedict BMR Calculator

  • Comparing BMR with calorie intake before building a diet plan.
  • Teaching how weight, height, age, and sex affect resting energy expenditure.
  • Using Harris-Benedict as an alternative to Mifflin-St Jeor in nutrition discussions.

Frequently asked questions about Harris-Benedict BMR Calculator

What inputs does Harris-Benedict BMR Calculator need?

Select male or female because the Harris-Benedict equation uses different constants by sex.

How should I interpret the result?

To estimate total daily needs, multiply BMR by an activity factor; that is a separate TDEE step.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.