Tool
BMI calculator.
An adult BMI estimate from height and weight, with a reference range and a healthy-weight estimate. Runs in your browser; nothing is uploaded.
Enter your height and weight to see an estimate.
Adult reference
Healthy-weight estimate for this height (BMI 18.5–24.9): —
BMI does not measure body composition. Cutoffs vary by ethnicity. This is not a diagnosis.
What BMI is — and what it is not.
Body mass index is weight in kilograms divided by height in meters squared. It is a quick, population-level reference that can be useful as a starting point, but it cannot tell you how much of your weight is fat, muscle, bone, or water.
Adult reference ranges
| BMI | Reference label |
|---|---|
| Below 18.5 | Below adult reference range |
| 18.5–24.9 | Within adult reference range |
| 25.0–29.9 | Above adult reference range |
| 30.0 and above | Well above adult reference range |
These labels are neutral descriptions of a reference range. They are not a judgment about your health or appearance.
What BMI does not tell you
- Body fat percentage or muscle mass.
- Where fat is stored (waist circumference can add context).
- Whether you are metabolically healthy.
- How a medication, pregnancy, or medical condition affects your weight.
- Whether a particular weight is appropriate for you.
How to use this calculator
- Choose metric or imperial units.
- Enter your height and weight as accurately as you can.
- Read the estimate as a reference, not a target.
- If you want to track change over time, use the app’s weight trend.
BMI questions.
Is BMI a diagnosis?
Is this calculator for children?
Why does my BMI differ from the app?
Does this page send my data anywhere?
Keep exploring
Track the trend
A BMI is a snapshot. A trend is a story.
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