A familiar situation
Check an adult BMI screening value before discussing weight and height with a healthcare professional.
How to use this calculator
- Enter weight, height.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How bmi is calculated
BMI = weight in kilograms divided by height in metres squared. Categories are the CDC adult thresholds; for people under 20, interpretation requires age- and sex-specific growth charts. At 70 kg and 1.75 m, BMI is 70/1.75² = 22.9.
BMI=weight(kg)/height(m)².At 70 kg and 1.75 m, BMI is 70/1.75² = 22.9.
Assumptions & useful context
For adults 20 and older; pediatric BMI uses age- and sex-specific percentiles.
Health calculations are estimates for education. They cannot diagnose a condition or replace a clinician’s assessment. Individual needs vary, especially during pregnancy, illness and growth.
Frequently asked questions
Is BMI a diagnosis?
No. It is a screening measure and should be considered with other health information.
Can I use this for a child?
No. Children and teens need age- and sex-specific percentiles.