What is the Harris-Benedict equation?

The original Harris-Benedict equation (1919) estimates BMR from weight, height, and age. The revised version by Roza and Shizgal (1984) corrects for systematic overestimation. TDEE = BMR × activity factor.

What activity multipliers are used?

Sedentary (desk job, no exercise): 1.2. Lightly active (1-3 days/week): 1.375. Moderately active (3-5 days): 1.55. Very active (6-7 days): 1.725. Extra active (physical job + exercise): 1.9.

How accurate is Harris-Benedict?

For the general population, Harris-Benedict estimates TDEE within ±10-15%. Athletic populations with high muscle mass may be underestimated since the formula does not account for body composition.

TDEE Harris-Benedict Calculator

Calculate Total Daily Energy Expenditure using the revised Harris-Benedict equation (Roza & Shizgal 1984) with your BMR and activity multiplier.

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Frequently Asked Questions

What is the Harris-Benedict equation?

What activity multipliers are used?

How accurate is Harris-Benedict?