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Harris-Benedict Equation — BMR & TDEE
Basal metabolic rate and total daily energy expenditure with activity adjustment
Original Harris-Benedict (1919)
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BMR (kcal/day)
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TDEE (kcal/day)
Revised Harris-Benedict — Roza-Shizgal (1984)
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BMR (kcal/day)
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TDEE (kcal/day)
Mifflin–St Jeor (Most Accurate)
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BMR (kcal/day)
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TDEE (kcal/day)
Activity Multipliers
| Level | Factor | Description |
|---|---|---|
| Sedentary | ×1.2 | Desk job, little exercise |
| Light | ×1.375 | Light exercise 1–3 days/week |
| Moderate | ×1.55 | Moderate exercise 3–5 days/week |
| Active | ×1.725 | Hard exercise 6–7 days/week |
| Very active | ×1.9 | Physical job + double training |
Original HB Male: 66.5 + 13.75W + 5.003H − 6.775A
Original HB Female: 655.1 + 9.563W + 1.850H − 4.676A
Mifflin Male: 10W + 6.25H − 5A + 5
Mifflin Female: 10W + 6.25H − 5A − 161
TDEE = BMR × Activity Factor
Original HB Female: 655.1 + 9.563W + 1.850H − 4.676A
Mifflin Male: 10W + 6.25H − 5A + 5
Mifflin Female: 10W + 6.25H − 5A − 161
TDEE = BMR × Activity Factor
Clinical Note: Mifflin–St Jeor is most accurate for most populations (validated in obese and non-obese adults). For critically ill/hospitalised patients, use indirect calorimetry if available, or apply stress factors: infection ×1.2, surgery ×1.3, severe burns ×1.5–2.0.
For clinical decision support only. Not a substitute for professional medical judgment.
