BMI Calculator
Check your body mass index and the healthy weight range for your height.
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How it works
How we calculate your BMI
BMI compares your weight to your height using a standard formula.
1
The formula
BMI is your weight in kilograms divided by your height in meters squared.
2
The categories
Under 18.5 is underweight, 18.5–24.9 is a healthy weight, 25–29.9 is overweight, and 30 or more is obesity.
3
Your healthy range
We also show the weight range that falls within a BMI of 18.5–24.9 for your height.
Tips
What BMI can’t tell you
Muscle vs. fat
BMI can’t tell muscle from fat, so very muscular people may read as overweight.
Waist matters
Where you carry weight matters too. Your waist size can add useful context.
Track more than weight
Energy, strength, blood pressure and lab results all show progress.
Talk it through
Your clinician can help you interpret BMI alongside your overall health.
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Nudge is owned and operated by Elys Health Technology Ltd.
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