BMI Calculator
Calculate body mass index from height and weight using metric units, with the standard adult category ranges.
Set your values
Adjust the values, then calculate your result.
How to use BMI Calculator
- Enter the measurements or amounts in the fields above.
- Check that dimensions, rates and units match the labels.
- Select “Calculate BMI” to see a clear estimate and the formula used.
How the bmi calculator works
BMI = weight in kilograms ÷ height in metres squared. Adult screening ranges are shown as general reference values.
Check your measurements and assumptions
BMI is a screening measure, not a diagnosis. It does not distinguish muscle from fat and is not intended for children, pregnancy or individual medical decisions. Ask a health professional about personal results.
Review the estimate before you act
Compare this result with an independent measurement, supplier quote or institution guidance when the decision matters. Confirm that the units and assumptions match the labels above, and update the inputs when the conditions change. Keep a note of the values used so you can reproduce the estimate later. This calculator is a planning aid and does not replace professional, product-specific or local guidance.
What is a healthy BMI?
Standard adult BMI categories range from underweight below 18.5, healthy weight 18.5–24.9, overweight 25–29.9 and obesity 30 or above. BMI alone cannot assess health.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.