Calculate body mass index from height and weight in either metric or imperial units, with the standard World Health Organization category and a clear explanation of what BMI can and cannot tell you.
Getting started
Choose metric (centimetres and kilograms) or imperial (feet, inches and pounds).
Enter your height and weight.
Read your BMI figure, its category, and the healthy weight range for your height.
Why it helps
Supports both unit systems without needing a separate conversion step.
Shows the healthy weight range for your height, which is more actionable than the index alone.
Explains the metric's genuine limitations rather than presenting it as a verdict.
In practice
Getting a rough baseline before a conversation with a doctor or dietitian.
Tracking a general trend over months rather than a single snapshot.
Understanding where a published BMI threshold sits in real weight terms.
Everything people ask most about the bmi calculator, answered plainly.
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