BMI Calculator

Free online BMI calculator with BMR and TDEE calculations. Calculate your body mass index, basal metabolic rate, and total daily energy expenditure using weight, height, age, sex, and activity level.

Health Metrics

BMI, BMR, and TDEE Notes

  • BMI reflects body mass relative to height and is for screening only.
  • BMR is estimated with the Mifflin-St Jeor equation.
  • \(TDEE= BMR\times \text{activity multiplier}\) This tool is for general reference and not a medical diagnosis.

Metric Explanation

BMI reflects weight relative to height for screening purposes and does not directly measure body fat percentage.

Underweight: BMI < 18.5
Normal: 18.5 <= BMI < 24.9
Overweight: 25 <= BMI < 29.9
Obese: BMI >= 30

BMR is the estimated minimum daily energy use at complete rest.

TDEE is estimated total daily energy expenditure based on BMR and activity level.

Daily calorie reference (based on TDEE)
Weight maintenance-
Fat loss reference (about -300 kcal)-
Muscle gain reference (about +300 kcal)-