← All Calculators

BMI Calculator — Free Online Calculator

Calculates Body Mass Index and weight category from height and weight.

What is it?

Body Mass Index (BMI) is a screening number calculated from height and weight that indicates whether a person is in a healthy weight range for their height.

Formula

BMI = weight (kg) / height (m)² Categories: < 18.5 Underweight | 18.5–24.9 Normal | 25–29.9 Overweight | ≥ 30 Obese

Example

Weight 78 kg, height 1.75 m. BMI = 78 / (1.75²) = 78 / 3.0625 ≈ 25.5 → Overweight category.

Loading calculator…