BMI Calculator
Body mass index and category from height & weight
Height (cm)
Weight (kg)
Enter your height and weight
Understand your body mass index
BMI (body mass index) is your weight in kilograms divided by the square of your height in meters — a quick gauge of whether your weight is appropriate for your height. This calculator uses the standard WHO ranges to show underweight, normal, overweight, and obese categories plus your healthy weight range. Everything runs in your browser.
See underweight, normal, overweight, and obese categories with a color gauge.
Shows the healthy weight range for your height in kg or lb.
Enter cm and kg, or feet, inches, and pounds.
Frequently asked questions
BMI = weight (kg) ÷ height (m) squared. For 170 cm and 65 kg, that is 65 ÷ (1.7 × 1.7) ≈ 22.5.
By WHO standards, 18.5–24.9 is normal. Below 18.5 is underweight, 25 or above is overweight, and 30 or above is obese.
BMI is a rough indicator. It does not account for muscle mass, body fat, age, or sex, so athletes may see skewed results. Consult a professional for an accurate assessment.
No. All calculation happens in your browser; your inputs are never sent or stored anywhere.