Estimates resting energy expenditure using the revised Harris–Benedict equations. This clinical guide covers appropriate use, calculation, interpretation, limitations and practical safeguards.
Overview
Estimates resting energy expenditure using the revised Harris–Benedict equations.
Clinical Significance
The revised Harris–Benedict equation estimates resting energy expenditure. It should not be treated as a direct measurement or a complete nutrition prescription.
When to Use
- Estimate adult resting energy expenditure when indirect calorimetry is unavailable.
- Use consistent metric units.
- Compare with clinical progress and intake tolerance.
How It Is Calculated
- Men: 88.362 + 13.397W + 4.799H − 5.677A. Women: 447.593 + 9.247W + 3.098H − 4.330A.
- The calculator validates the required inputs before applying the equation and rounds only the displayed result.
Interpretation
- The revised Harris–Benedict equation estimates resting energy expenditure. It should not be treated as a direct measurement or a complete nutrition prescription.
- Review the component values and assumptions as well as the final result.
Worked Example
Enter clinically plausible values in the stated units. MedicalC applies: Men: 88.362 + 13.397W + 4.799H − 5.677A. Women: 447.593 + 9.247W + 3.098H − 4.330A. Review the displayed result against the source data and the relevant clinical pathway.
Patient Considerations
- Confirm that the patient and clinical setting match the population or physiologic assumptions behind the equation.
- Consider whether treatment, organ function, pregnancy, body composition, sampling conditions or acute illness materially alter interpretation.
- Use serial calculations only when methods and units remain comparable.
Limitations
- Prediction error increases in critical illness and unusual body composition.
- It does not include activity or disease-specific energy expenditure.
- The appropriate body weight in obesity or oedema may require specialist judgement.
Clinical Pearls
- Use one validated equation consistently for follow-up.
- Avoid combining equation error with uncritical stress factors.
- Monitor actual weight trajectory and clinical outcomes.
Common Mistakes
- Entering pounds or inches.
- Confusing resting energy expenditure with total daily requirements.
- Rounding inputs excessively before calculation.
Evidence Base
The implementation uses the published or established relationship: Men: 88.362 + 13.397W + 4.799H − 5.677A. Women: 447.593 + 9.247W + 3.098H − 4.330A. The cited source should be reviewed alongside current specialty guidance before clinical deployment.
Frequently Asked Questions
What does the Revised Harris–Benedict Resting Energy Expenditure calculator do?
Estimates resting energy expenditure using the revised Harris–Benedict equations.
Can the result be used by itself?
No. The result is clinical decision support and must be interpreted with the source measurements, patient context and current guidance.
What most commonly makes the result unreliable?
Entering pounds or inches.
When should the calculation be repeated?
Repeat it when a relevant input, sampling condition, treatment or clinical state changes.
Does the calculator replace direct measurement or specialist review?
No. Use direct measurement, validated software or specialist review whenever the clinical decision requires greater precision.
References
- Roza AM, Shizgal HM. The Harris Benedict equation reevaluated. Am J Clin Nutr. 1984. — Primary publication, authoritative guideline or recognised clinical source supporting the calculation.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026