How to Calculate Harris Benedict
What is Harris Benedict?
Harris-Benedict equation estimates basal metabolic rate from age, sex, weight, and height. It's a foundation for caloric needs calculation.
Formula
Males: BMR = 88.362 + (13.397 × weight) + (4.799 × height) - (5.677 × age)
- BMR
- 447 — 447
Step-by-Step Guide
- 1Males: BMR = 88.362 + (13.397 × weight) + (4.799 × height) - (5.677 × age)
- 2Females: BMR = 447.593 + (9.247 × weight) + (3.098 × height) - (4.330 × age)
- 3Weight in kg, height in cm, age in years
Worked Examples
Input
Male, 80 kg, 180 cm, 40 years old
Result
BMR ≈ 1790 kcal/day
Basal energy only
Common Mistakes to Avoid
- ✕Forgetting to convert to correct units
- ✕Using actual weight in obese patients (use adjusted body weight)
Frequently Asked Questions
Is Harris-Benedict still widely used?
Yes, but Mifflin-St Jeor is preferred. Harris-Benedict over-estimates in modern populations.
What's the difference from Mifflin-St Jeor?
Both reasonable; Mifflin slightly lower and more accurate for average weight. Harris-Benedict better for very lean.
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