BMR (Harris–Benedict) + TDEE Calculator
Estimate basal metabolic rate and daily calorie needs using the Harris–Benedict equation and an activity multiplier.
Use this Harris Benedict Calculator to estimate basal metabolic rate (BMR) and activity-adjusted daily calorie needs (TDEE).
Harris–Benedict Method
The calculator uses the original Harris–Benedict equations:
Male: BMR = 66.5 + (13.75 × weight in kg) + (5.003 × height in cm) − (6.755 × age)
Female: BMR = 655.1 + (9.563 × weight in kg) + (1.850 × height in cm) − (4.676 × age)
Daily calorie needs are then estimated with:
TDEE = BMR × activity factor
Example
For a 30-year-old male weighing 80 kg and measuring 180 cm:
BMR = 66.5 + (13.75 × 80) + (5.003 × 180) − (6.755 × 30)
BMR ≈ 1,864 calories/day
Using a moderate activity factor of 1.55:
TDEE ≈ 1,864 × 1.55 = 2,890 calories/day
This gives an estimated maintenance intake of approximately 2,890 calories per day.
Important Limitations
The Harris–Benedict equation predicts energy needs from age, sex, height, and weight. It does not directly measure metabolism or body composition, so actual calorie needs can differ.
Use the result as a starting estimate and adjust according to real body-weight trends, activity, and health circumstances.