Harris-Benedict TDEE Calculator (1984 Revision)
Calculate Total Daily Energy Expenditure using the Roza and Shizgal (1984) revision of the Harris-Benedict equation. Compare BMR and caloric needs.
About
The Harris-Benedict equation estimates basal metabolic rate based on gender, weight, height, and age. This tool utilizes the 1984 Roza and Shizgal revision. Medical professionals often prefer this version for specific clinical comparisons alongside the Mifflin-St Jeor equation. Accuracy relies on precise input of physical characteristics. Errors in height or weight measurements propagate through the linear coefficients. The formula assumes a resting state in a thermoneutral environment. It does not account for lean body mass directly. Individuals with high muscle mass may find this underestimates needs. Conversely, it may overestimate needs for individuals with higher body fat percentages.
Formulas
The 1984 Roza and Shizgal revision defines BMR as:
Where P is heat production (kcal/day), m is mass (kg), h is height (cm), and a is age (years). TDEE is calculated by multiplying P by the activity factor f.
Reference Data
| Activity Level | Multiplier | Description | Example (BMR 1600) |
|---|---|---|---|
| Sedentary | 1.2 | Little or no exercise, desk job | 1920 kcal |
| Lightly Active | 1.375 | Light exercise/sports 1-3 days/week | 2200 kcal |
| Moderately Active | 1.55 | Moderate exercise/sports 3-5 days/week | 2480 kcal |
| Very Active | 1.725 | Hard exercise/sports 6-7 days/week | 2760 kcal |
| Extra Active | 1.9 | Very hard exercise/physical job | 3040 kcal |
| Physical Job (Low) | 1.4 | Standing work, light lifting | 2240 kcal |
| Physical Job (High) | 2.0 | Construction, farming, heavy lifting | 3200 kcal |
| Athlete (Endurance) | 2.2 | Competitive training (2+ hours/day) | 3520 kcal |