BMI Calculator
Calculate adult body mass index using metric or imperial units.
Your result will appear here
Enter your values and select Calculate. Everything is processed privately in your browser.
Calculation result
How to use the BMI calculator
Calculate adult body mass index using metric or imperial units. Enter the requested values to get a clear result and supporting figures without creating an account.
Step by step
- Enter or select each requested value.
- Review units, percentages, dates, and assumptions for accuracy.
- Choose Calculate and use the primary result together with the supporting breakdown.
Common uses
- Run a quick BMI estimate without a spreadsheet.
- Compare different scenarios by changing one input at a time.
- Check a manual calculation and understand the figures behind the result.
Good to know
BMI is an adult screening measure and does not diagnose health or account for muscle mass, pregnancy, age, or body composition. Discuss health concerns with a qualified clinician. Calculations stay in your browser.
Frequently asked questions
What does the BMI calculator calculate?
Calculate adult body mass index using metric or imperial units. It uses the values you enter to show a primary result and a supporting breakdown.
How accurate is the BMI calculator?
The BMI calculator applies the formula and assumptions shown on its page. Treat the result as an estimate and verify current rates, rules, dates, and source values before making an important decision.
Does the BMI calculator save my inputs?
No. The BMI calculator runs in your browser, and FreeToolBase does not upload or store the values you enter.