Free Online Tool • Metric & Imperial Units • Instant Results
Use our free BMI calculator to check your Body Mass Index in seconds. Supports both metric (kg/cm) and imperial (lbs/inches) units. Know instantly if you're underweight, normal weight, overweight, or obese.
Enter your details and click calculate to see your BMI.
| Category | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Normal Weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity | 30.0 and above |
Note: BMI is a general guideline. Athletes, pregnant women, and elderly may have different interpretations.
BMI is a measurement calculated from your height and weight. The formula is BMI = weight (kg) ÷ height² (m²). It gives a quick indication of whether a person has a healthy body weight.
BMI is a useful screening tool but has limitations. It doesn’t differentiate between muscle and fat, so very muscular people (e.g.g., athletes) may appear “overweight” or “obese” despite having low body fat.
Yes, the formula and categories are identical for adult men and women. However, at the same BMI, women generally have slightly higher body fat percentage than men.
No. This calculator is for adults 18+ only. Children and teens require age- and sex-specific BMI percentiles.
High BMI is associated with increased risk of type 2 diabetes, heart disease, high blood pressure, certain cancers, and joint problems.
Absolutely! It’s 100% free, works entirely in your browser, and we do not collect or store any personal data.