BMI Calculator
Calculate your Body Mass Index and see your healthy weight range.
Your Measurements
How to Use the BMI Calculator
- Select your preferred unit system — metric (cm / kg) or imperial (ft, in / lbs).
- Enter your height. For imperial, enter feet and inches separately.
- Enter your current weight.
- Your BMI score, category, and healthy weight range for your height appear instantly.
Understanding BMI Categories
BMI (Body Mass Index) is a number calculated from your height and weight. It is a widely used screening tool for weight categories that may lead to health problems, though it is not a diagnostic measure on its own.
| BMI Range | Category | Health Considerations |
|---|---|---|
| Below 18.5 | Underweight | May indicate nutritional deficiency; worth discussing with a doctor. |
| 18.5 – 24.9 | Normal weight | Associated with the lowest risk for most weight-related conditions. |
| 25.0 – 29.9 | Overweight | Modestly elevated risk for some conditions; lifestyle changes are often beneficial. |
| 30.0 and above | Obese | Higher risk for cardiovascular disease, type 2 diabetes, and other conditions. |
Frequently Asked Questions
Is BMI an accurate measure of health?
BMI is a useful population-level screening tool, but it has limitations for individuals. It does not distinguish between muscle and fat mass, so athletes and very muscular people often register as overweight despite being healthy. It also does not account for age, sex, bone density, or fat distribution.
How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = weight (kg) ÷ height² (m²). In imperial units the formula is: BMI = 703 × weight (lbs) ÷ height² (inches²).
What BMI range is considered healthy for adults?
For most adults, a BMI of 18.5 to 24.9 is considered healthy. However, these thresholds may differ slightly for older adults and certain ethnic populations. Always consult a healthcare provider for a complete health assessment.
Does BMI apply to children?
For children and teens (ages 2–19), BMI is interpreted differently using age- and sex-specific growth charts. This calculator is designed for adults. For children, consult a pediatrician or use a CDC growth chart.
Disclaimer: BMI results are for informational and educational purposes only and do not constitute medical advice. Consult a qualified healthcare provider before making any changes to your diet or exercise habits.