Harris-Benedict Calculator: BMR & Daily Calories

BMR (Harris–Benedict) + TDEE Calculator

Estimate basal metabolic rate and daily calorie needs using the Harris–Benedict equation and an activity multiplier.

Inputs

Sex

Male Female

Required for Harris–Benedict constants.

Age Enter age in full years. Daily activity level (PAL) TDEE = BMR × activity factor.

Height

Uses source-value unit switching to avoid drift.

Weight

Switching units preserves the original source weight.

Results

Basal metabolic rate (BMR)

—

Estimated kcal/day at rest

Total daily energy expenditure (TDEE)

—

Estimated maintenance kcal/day

Activity factor used

—

Selected PAL multiplier

Normalized height

—

Stored internally in centimeters

Normalized weight

—

Stored internally in kilograms

Equation used

—

Original Harris–Benedict constants

Quick summary

Enter your details and click Calculate.

Step-by-step derivation

Provide inputs to see the working with your numbers.

BMR is estimated with the original Harris–Benedict equation. TDEE is then estimated by multiplying BMR by your selected activity factor.

This calculator is for general education only and does not replace medical or nutrition advice.

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