BMI Calculator
Calculate Body Mass Index in metric or imperial units.
Your BMI
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BMI is a general screening measure and doesn't account for muscle mass, age or body composition. Talk to a healthcare professional for personal advice.
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- Weight Converter — Convert your weight between kilograms, pounds and stones.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the BMI Calculator
Calculate BMI from height and weight using metric or imperial inputs.
- 1 Choose Metric or Imperial.
- 2 Enter height in the displayed units and weight in kilograms or pounds.
- 3 Review the BMI result and the tool’s screening category.
Example and practical tips
At 70 kg and 1.75 m, BMI is approximately 22.9 using weight divided by squared height in meters.
Further reading
Frequently asked questions
Does BMI diagnose health or measure body fat?
No. BMI is a screening measure and does not directly measure body fat or replace an individual health assessment.
Is this an age-specific calculator for children?
No. The interface uses fixed categories and has no age or sex inputs. Children and teens need age-specific interpretation rather than these adult-style labels.