BMI calculator
Check your body mass index and the healthy weight range for your height.
Free No sign-up Runs in your browser
How it works
How to use the BMI Calculator tool
- 1
Choose units
Metric (kg, cm) or imperial (lb, ft/in).
- 2
Enter height and weight
Use the sliders or type values.
- 3
See your result
BMI, category and healthy weight range.
How BMI is calculated
BMI = weight (kg) ÷ height (m)². WHO adult categories: under 18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, 30+ obesity. Some health authorities, including in India, use lower cut-offs for South Asian adults because of higher risk at lower BMI.
Limitations
We’d rather be upfront about what this tool can’t do yet:
- Not valid for children, pregnant women or very muscular people.
- BMI is a screening tool, not a diagnosis.
FAQ
Frequently asked questions
Is my data sent anywhere?
No. All processing happens locally in your browser. Nothing you enter is uploaded, stored or logged.
Is BMI accurate?
It’s a useful population-level indicator but doesn’t distinguish muscle from fat. Waist measurement adds useful context.
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