BMI Calculator
Calculate body mass index from height and weight, with the healthy range shown.
What this calculator does
Enter your height and weight in metric or imperial units to get your body mass index and the World Health Organization weight category it falls into.
Inputs and what they mean
- Units
- — choice value.
- Height
- — number value.
- Weight
- — number value.
- Height (feet)
- — number value.
- Height (inches)
- — number value.
- Weight
- — number value.
How to use it
- Choose metric (cm and kg) or imperial (feet, inches and pounds).
- Enter your height. In imperial, fill in both the feet and the inches boxes.
- Enter your weight in the matching unit.
- Read the BMI figure and the weight category it falls into, then use Reset to try other numbers.
Formula
Body mass index divides your weight in kilograms by the square of your height in metres (BMI = kg ÷ m²). Imperial entries are converted to metric first, so both unit systems give the same answer.
Worked example
175 cm and 70 kg
Someone 175 cm tall weighing 70 kg has a BMI of 70 ÷ 1.75², which is 22.9 — inside the healthy range of 18.5 to 24.9.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Common questions
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