BMI Calculator

For most adults, a BMI between 18.5 and 24.9 is considered a healthy or "normal" range. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese. These thresholds apply to adults aged 18–65 and are the WHO standard.

BMR (Basal Metabolic Rate) is the number of calories your body burns at total rest — just to keep you alive. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor (1.2 to 1.9) to account for exercise, walking, and daily movement. Your TDEE is the number to use when planning calorie intake.

The BMI-based body fat formula (Deurenberg) is a population estimate and is least accurate for athletes, the elderly, and pregnant people. For a clinical-grade measurement you need DEXA scanning, hydrostatic weighing, or skinfold calipers. Use this estimate as a rough orientation, not a diagnosis.

A waist-to-height ratio (WHtR) below 0.5 is associated with lower cardiometabolic risk in most adults. A ratio above 0.6 indicates substantially elevated risk. Unlike BMI, WHtR accounts for fat distribution — central (abdominal) fat is a stronger predictor of health risk than total weight.