Your Results
Enter your height and weight to see your BMI instantly.
BMI Categories
BMI is a general indicator. Consult a healthcare professional for personalized advice.
What is BMI?
BMI (Body Mass Index) is a number calculated from your height and weight. It's used as a screening tool to indicate whether you're underweight, normal weight, overweight, or obese. BMI does not measure body fat directly.
How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²). For example: weight 70 kg, height 1.75 m gives BMI = 70 ÷ (1.75 × 1.75) ≈ 22.9.
You can use our calculator above with metric (centimeters and kilograms) or imperial (feet, inches, and pounds)—we do the conversion for you.
Is BMI always accurate?
No. BMI doesn't distinguish muscle from fat, so muscular athletes can read as "overweight," and it can underestimate body fat in older adults. It's a screening tool, not a diagnosis. Read more in our guide: Is BMI accurate? — or try the body fat calculator for a different measure.
Frequently asked questions
- What is BMI?
- BMI (Body Mass Index) is a number calculated from your height and weight. It's used as a screening tool to indicate whether you're underweight, normal weight, overweight, or obese. BMI does not measure body fat directly.
- How is BMI calculated?
- BMI is calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²). For example: weight 70 kg, height 1.75 m gives BMI = 70 ÷ (1.75 × 1.75) ≈ 22.9.
- What is a normal BMI?
- A normal or healthy BMI for adults is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese. BMI is a general indicator; consult a healthcare provider for personalized advice.
- What is a healthy weight for my height?
- A healthy weight is one that puts your BMI between 18.5 and 24.9. For example, at 5'10" (178 cm) that's roughly 129–174 lbs (59–79 kg). Enter your height in the calculator above to see your personal healthy weight range.
For more on BMI and health, see the CDC's BMI information.