BMI Calculator
Check Body Mass Index from height and weight using metric or imperial units.
kg
cm
About this calculator
Body Mass Index is a height-to-weight ratio used as a screening number, not a diagnosis. Muscle mass, age, and body composition can place a healthy person outside the “healthy” BMI band.
How to calculate
Choose metric or imperial units, enter height and weight, and calculate. The result includes BMI and the WHO category.
Metric: BMI = kg / m²
Imperial: BMI = 703 × lb / in²
Examples
70 kg at 175 cm
Height is 1.75 m. BMI = 70 / 1.75² ≈ 22.9, which is in the healthy range.
FAQ
Is BMI accurate for athletes?
Often not. Extra muscle can raise BMI without meaning excess fat. Treat BMI as a starting point, not a complete health picture.
Which BMI ranges are used here?
WHO adult categories: underweight below 18.5, healthy 18.5–24.9, overweight 25–29.9, and obesity 30 and above.