Simple and transparent
How this calculator works
BMI divides weight in kilograms by height in metres squared. Imperial inputs are converted before the formula is applied.
Body Mass Index FormulaBMI = weight (kg) ÷ height² (m)
- Use metres for height
- Use kilograms for weight
- Adult reference: 18.5–24.9
What you’ll get
A clear BMI value
See the main estimate immediately.
Useful context
Understand the result with a visual breakdown.
Planning summary
Compare inputs, assumptions and next steps.
