Formula-based result
Enter measurements and select Calculate.
Formula and adult categories
BMI = weight in kilograms ÷ height in meters².
Adult BMI screening categories for age 20+ are below 18.5 Underweight, 18.5 to under 25 Healthy weight, 25 to under 30 Overweight, and 30 or greater Obesity.
Important limitations
BMI does not directly measure body fat. Muscularity, body composition, pregnancy, and other factors affect interpretation. Adult categories do not apply to children or teens, and the result is not a diagnosis.
Worked example
At 70 kg and 175 cm, BMI is approximately 22.9. The category shown is an adult screening label, not a diagnosis.
Educational adult-use boundary
This calculator is an informational mathematical estimator for adults. It does not diagnose health, recommend treatment, prescribe food intake, define an ideal body, or provide pediatric or pregnancy guidance.