BMI Calculator

Calculate your Body Mass Index instantly in metric or imperial units. See your category, visualise where you fall on the BMI scale, and understand what the number means.

Your measurements

Weight 70 kg

Height 175 cm

Your BMI

22.9

Normal weight

1618.5253040

Category	BMI range
Underweight	Below 18.5
Normal weight	18.5 – 24.9
Overweight	25 – 29.9
Obese	30 and above

How BMI is calculated

Choose your units

Select metric (kg and cm) or imperial (lbs and inches/feet). Both produce identical results — just enter whichever measurements you have available.

Enter weight and height

Weigh yourself without shoes or heavy clothing for the most accurate result. Use your height without shoes. Minor changes in these numbers have a small effect on BMI.

Read your result

Your BMI number, category (underweight, normal, overweight, or obese), and position on the visual scale are shown instantly. The highlighted row in the table shows your category.

The metric BMI formula is: BMI = weight(kg) ÷ height(m)². For imperial: BMI = (weight(lbs) ÷ height(in)²) × 703. The World Health Organisation defines normal weight as a BMI between 18.5 and 24.9.

BMI is a useful screening tool but has known limitations — it cannot distinguish between muscle and fat mass, and does not account for age, sex, or body fat distribution. Use it as a starting point for conversation with a healthcare professional, not as a definitive health verdict.