BMI Calculator — Free Body Mass Index Calculator Online
Calculate your Body Mass Index using metric or imperial measurements. Understand what your BMI means for your health.
BMI Categories
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Risk of nutritional deficiency |
| 18.5 – 24.9 | Normal weight | Low risk |
| 25.0 – 29.9 | Overweight | Moderate risk |
| 30.0 – 34.9 | Obese (Class I) | High risk |
| 35.0 – 39.9 | Obese (Class II) | Very high risk |
| 40+ | Obese (Class III) | Extremely high risk |
⚕️ Disclaimer: BMI is a general screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or other health factors. Consult a healthcare professional for personalized advice.
Frequently Asked Questions
A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese.
Not always. BMI does not distinguish between muscle and fat. Athletes with high muscle mass may show an elevated BMI despite being healthy. Consult a healthcare provider for a more complete assessment.
Yes. Switch to the Imperial tab and enter your height in feet and inches and your weight in pounds.
No. This calculator uses adult BMI ranges. BMI for children is calculated differently and requires age- and sex-specific percentile charts. Consult a pediatrician.