justyourcalculatorBMI Calculator
Your body mass index and healthy weight range.
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BMI Calculator
Body mass index and healthy weight range
Your BMI
23 kg/m²
Normal
- Healthy BMI range
- 18.5 - 25
- Healthy weight for your height
- 128.9 lb - 174.2 lb
- BMI PrimeBMI divided by 25; under 1 is below the overweight line
- 0.92
- Ponderal index
- 12.9 kg/m³
BMI is a screening measure for adults. It doesn't tell fat from muscle, so athletes can score high while being healthy. It's not a diagnosis.
- BMI
How it was calculated
- BMI = 703 × pounds / inches²
- = 703 × 160 / 70² = 23
| Category | BMI | Weight at your height |
|---|---|---|
| Severe thinness | under 16 | under 112 lb |
| Moderate thinness | 16 - 17 | 112 lb - 118 lb |
| Mild thinness | 17 - 18.5 | 118 lb - 129 lb |
| Normal | 18.5 - 25 | 129 lb - 174 lb |
| Overweight | 25 - 30 | 174 lb - 209 lb |
| Obese class I | 30 - 35 | 209 lb - 244 lb |
| Obese class II | 35 - 40 | 244 lb - 279 lb |
| Obese class III | 40 and over | 279 lb+ |
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How the bmi calculator works
BMI (body mass index) is weight in kilograms divided by height in meters squared. In US units it's 703 × pounds divided by inches squared. The World Health Organization calls 18.5 to 24.9 normal, 25 to 29.9 overweight and 30 or more obese.
BMI Prime is your BMI divided by 25, the top of the normal range, so 1.10 means 10% over it. The ponderal index divides by height cubed instead, which suits very tall and very short people a little better.
BMI can't see body composition: muscular people read high and older adults with little muscle can read low. For ages 2 to 19 it has to be compared with age and sex percentiles on CDC growth charts rather than the adult bands.
Using and checking your result
Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.
This tool provides an estimate, not a diagnosis, treatment plan or individualized medical advice. Population formulas may not fit children, pregnancy, athletes or people with health conditions. Discuss health decisions with a qualified clinician.
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Primary references and further reading
Reference links help you check assumptions; they do not mean the publisher has reviewed or endorsed this calculator.