BMI calculation runs locally in your browser. Nothing is uploaded.
BMI Calculator
Enter height and weight in metric or imperial units to calculate Body Mass Index and see the matching BMI category instantly.
BMI calculation runs locally in your browser. Nothing is uploaded.
Calculate BMI
Private BMI calculation with clear units
Use this BMI calculator for a quick Body Mass Index estimate from kilograms and centimeters or pounds and inches. The age calculator is nearby when you also need a date-based age result.
BMI is a simple population-level measure and does not capture body composition, pregnancy, athletic build, or medical context. Treat the result as a math estimate, not a diagnosis.
How to use this tool
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Choose units
Select metric for kilograms and centimeters, or imperial for pounds and inches.
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Enter height and weight
Add positive values for your chosen unit system. The BMI result updates live.
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Review BMI category
Check the BMI value and category, then copy the result if you need to save it.
FAQ
Does this BMI calculator upload my data?
No. Height and weight are processed locally in your browser.
What BMI formula is used?
BMI is weight in kilograms divided by height in meters squared. Imperial input is converted to kilograms and meters first.
What are the BMI categories?
The calculator uses common cutoffs: under 18.5, 18.5 to 24.9, 25 to 29.9, and 30 or above.
Is BMI medical advice?
No. BMI is a general math estimate and should not replace guidance from a qualified health professional.