BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units. See your BMI value and category instantly.
Result will appear here.
This calculator is for informational purposes only and does not replace medical advice.
How it works
BMI (Body Mass Index) is calculated using height and weight.
Metric formula: BMI = weight (kg) ÷ height (m)²
Imperial formula: BMI = (weight (lb) ÷ height (in)²) × 703
The result is compared against standard adult BMI categories.
- Underweight: Below 18.5
- Normal weight: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obesity: 30 and above
Examples
- 170 cm, 65 kg → BMI ≈ 22.49 (Normal range)
- 180 cm, 90 kg → BMI ≈ 27.78 (Overweight)
- 70 in, 160 lb → BMI ≈ 22.96
FAQ
- Is BMI accurate? BMI is a screening tool. It does not directly measure body fat or muscle mass.
- Is this for adults? Yes. BMI categories shown here apply to adults, not children or teens.
- Does BMI consider muscle? No. Athletes may have a high BMI due to muscle mass.
- Which BMI chart is used? Standard adult BMI categories commonly referenced by global health organizations.
- Is my data stored? No. All calculations happen locally in your browser.