What are the revised Harris-Benedict equations?

Revised Harris-Benedict (Roza & Shizgal 1984): Male: 88.362 + (13.397 x weight kg) + (4.799 x height cm) - (5.677 x age years). Female: 447.593 + (9.247 x weight kg) + (3.098 x height cm) - (4.330 x age years). Original 1919 equations underestimated REE.

How is TDEE calculated from REE?

TDEE = REE x activity factor: sedentary (x1.2), lightly active (x1.375), moderately active (x1.55), very active (x1.725), extra active (x1.9). For clinical settings, metabolic stress factors: minor surgery x1.1-1.2, major surgery x1.3-1.5, burns x1.5-2.0.

How accurate is Harris-Benedict compared to indirect calorimetry?

Harris-Benedict has +/-15-20% error vs. indirect calorimetry (gold standard). Mifflin-St Jeor is more accurate in non-obese adults. For critically ill patients, ASPEN recommends 25-30 kcal/kg/day as a practical alternative to predictive equations.

Harris-Benedict REE Calculator

Calculate resting energy expenditure (REE) using Harris-Benedict equations. Male: 88.4 + 13.4xW + 4.8xH - 5.68xA. Female: 447.6 + 9.25xW + 3.1xH - 4.33xA. Multiply by activity factor for TDEE.

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Frequently Asked Questions

What are the revised Harris-Benedict equations?

How is TDEE calculated from REE?

How accurate is Harris-Benedict compared to indirect calorimetry?