How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in meters (kg/m²). For imperial units, it's weight in pounds divided by height in inches squared, multiplied by 703.
Calculators
BMI Calculator
Calculate your Body Mass Index, category, and a healthy weight range. Everything runs locally in your browser.
- BMI
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- Category
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- Healthy Weight Range
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FAQ
BMI Calculator FAQ
What do the BMI categories mean?
Using the WHO adult ranges: under 18.5 is Underweight, 18.5–24.9 is Normal weight, 25–29.9 is Overweight, and 30 or above is Obese.
Is BMI accurate for everyone?
BMI is a useful general screening tool but doesn't account for muscle mass, bone density, age, or sex, so it can be misleading for athletes, older adults, or during pregnancy. Use it as a starting point, not a diagnosis.
Is my height and weight data sent anywhere?
No. The calculation runs entirely in your browser using JavaScript — nothing is sent to TripleW Tools or any server.