BMI Calculator

Enter your height and weight in metric or imperial units to see your Body Mass Index, its category, and the healthy weight range for your height.

cm
kg
Your BMI —
Category —
Healthy weight for your height —
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BMI is a general screening tool, not a diagnosis. It does not account for muscle mass or body composition and is not intended for children, pregnancy, or athletes. For personal advice, speak to a healthcare professional.

How to Calculate BMI

Two numbers — height and weight — give your Body Mass Index.

1

Pick your units

Switch between Metric (centimetres and kilograms) and Imperial (feet, inches and pounds). Your entries convert automatically when you change units.

2

Enter height and weight

Type your height and weight. BMI is weight divided by height squared — kg/m² in metric, or 703 × lb/in² in imperial — and it updates instantly as you type.

3

Read your category and range

See your BMI, its WHO category on the colour scale, and the healthy weight range for your height so you know where you stand at a glance.

Frequently Asked Questions

How is BMI calculated?
BMI is your weight divided by the square of your height. In metric it is kilograms divided by metres squared (kg/m²). In imperial it is 703 times pounds divided by inches squared. This calculator does the maths for you in either unit.
What is a healthy BMI?
For adults the World Health Organization considers a BMI of 18.5 to 24.9 a healthy weight. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is in the obese range.
Is BMI accurate?
BMI is a quick screening tool, not a diagnosis. It does not distinguish muscle from fat, so very muscular people can read as overweight, and it is not designed for children, pregnancy, or the elderly. Treat it as a starting point and talk to a clinician for a full picture.
What is a healthy weight for my height?
A healthy weight is any weight that puts your BMI between 18.5 and 24.9 for your height. Enter your height and this calculator shows that healthy weight range in kilograms or pounds.
Is BMI different for men and women?
No. The BMI formula and the WHO weight categories are the same for both sexes, so a man and a woman of the same height and weight get the same BMI. At that same BMI, however, women typically carry a higher body-fat percentage than men. BMI is a general screening tool, not a body-composition measurement. The one exception is children and teens aged 2 to 19, where BMI is read as sex- and age-specific percentiles rather than fixed categories.