BMI Calculator
Calculate the ratio of body weight to height squared.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations retain full precision.
- BMI is a screening measure, not a diagnosis. It does not distinguish muscle from fat and has limitations for children, pregnancy and some body types.
Example Calculation
- Weight: 70 kg
- Height: 175 cm
70 kg at 175 cm gives a BMI of 22.86.
Frequently asked questions
How do I use this calculator?
Enter weight, height. The result updates automatically. Use Reset to restore the example values.
What method does it use?
BMI = weight (kg) / height (m)². BMI is a screening measure, not a diagnosis. It does not distinguish muscle from fat and has limitations for children, pregnancy and some body types.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.