BMI Calculator
Enter height and weight for your BMI, WHO category, and healthy weight range.
Healthy weight for your height:
For information only — not medical advice. Talk to a healthcare professional about what is healthy for you.
How to use the BMI calculator
- Pick your units. Metric (centimeters and kilograms) or imperial (feet, inches, and pounds).
- Enter height and weight. Use your morning measurements for the most consistent number.
- Press Calculate BMI. Your index appears with its WHO category and a gauge showing where you land.
- Check the healthy range. Below the gauge, see the weight range that would put you between BMI 18.5 and 24.9 at your height.
Frequently asked questions
How is BMI calculated?
Weight divided by height squared: kilograms per square meter in metric, or (pounds per square inch) times 703 in imperial. Both formulas give the same index.
What are the BMI categories?
The WHO bands: under 18.5 is underweight, 18.5 to 24.9 is the healthy range, 25 to 29.9 is overweight, and 30 or above is obese.
Is BMI accurate for athletes or muscular people?
Not always — BMI cannot tell muscle from fat, so very muscular people can score as overweight. It is a screening tool, not a diagnosis; a professional can assess body composition properly.
How is the healthy weight range worked out?
By rearranging the BMI formula: the weights that would put you between BMI 18.5 and 24.9 at your height.
Is this medical advice?
No. This calculator is for information only and is not medical advice. Talk to a healthcare professional about what is healthy for you.
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