Body composition calculator
BMI Calculator
Frequently asked questions
- How is BMI calculated?
- BMI = weight (kg) ÷ height (m)². With imperial inputs, use 703 × weight (lb) ÷ height (in)². This calculator follows common WHO adult category cutoffs.
- Is BMI an accurate measure of body fat?
- No. BMI is a population screening estimate from height and weight. It can misclassify muscular athletes and does not replace medical advice or direct body-fat measures.
- Can children use this BMI calculator?
- This page is for adults. Children and teens need age- and sex-specific BMI charts rather than adult WHO cutoffs.
How the formula works
Adult BMI is weight (kg) ÷ height (m)². With imperial inputs, the equivalent is 703 × weight (lb) ÷ height (in)². Categories shown here follow common WHO adult cutoffs: underweight below 18.5, normal 18.5–24.9, overweight 25–29.9, and obesity at 30+.
BMI is a population screening estimate, not a direct measure of body fat, muscle mass, or health. It can misclassify muscular athletes and does not replace medical advice. This page is for adults; children and teens need age- and sex-specific charts.
BMI calculator form
BMI calculator results
Estimated BMI24.7
Normal weight. Approximate healthy weight for this height: 59.9 kg – 80.7 kg.
BMI category reference
| Category | BMI range |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5–24.9 |
| Overweight | 25.0–29.9 |
| Obesity class I | 30.0–34.9 |
| Obesity class II | 35.0–39.9 |
| Obesity class III | 40.0+ |