BMI Calculator
Calculate your Body Mass Index (BMI) from your height and weight and learn your category.
Your BMI
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NormalBMI does not account for muscle mass and is not a standalone health indicator. Consult a professional for a medical evaluation.
Understanding Your BMI
What Is BMI and How Is It Calculated?
Body Mass Index (BMI) is a simple screening measure that estimates whether your weight is healthy for your height. It's calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). For example, someone 175 cm tall weighing 75 kg has a BMI of 75 ÷ (1.75 × 1.75) ≈ 24.5. Health organizations like the WHO use BMI as a quick, population-level screening tool rather than a precise diagnosis.
Limitations of BMI
BMI doesn't distinguish between muscle and fat, so athletes and muscular people can score as “overweight” despite low body fat. It also ignores age, sex, bone density, and fat distribution, and isn't designed for children, pregnant women, or the elderly. Treat it as a general starting point, not a diagnosis — pair it with other measures like waist circumference for a fuller picture.
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Frequently Asked Questions
How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²). It provides a quick estimate of whether your weight is in a healthy range for your height.
What do the BMI categories mean?
A BMI under 18.5 is considered underweight, 18.5–25 is normal, 25–30 is overweight, and 30 or above is considered obese. These ranges are general guidelines and can vary by individual.
What are the limitations of BMI?
BMI doesn't distinguish between muscle and fat, so athletes or very muscular people may show a higher BMI without excess body fat. Use it as a general guide, not a diagnosis.