Calculator guide
Estimate body mass index from height and weight as a screening measure for adults.
Formula or method
BMI = weight in kilograms ÷ height in meters²; in US units BMI = 703×lb/in².
How to use this calculator
- Select units.
- Enter height and weight.
- Review the numeric BMI and the broad adult screening range shown.
Worked example
A 70 kg adult who is 1.75 m tall has BMI=70/1.75²≈22.9.
Understanding the result
BMI is one population-level screening measure, not a diagnosis or complete measure of health, fitness, or body composition.
Limitations and assumptions
- Adult BMI categories are not intended for children, pregnancy, or every athlete.
- It does not distinguish muscle, bone, fat distribution, or medical conditions.
Frequently asked questions
Is BMI appropriate for children?
Children use age- and sex-specific growth charts rather than adult cutoffs.
Can a healthy person have an atypical BMI?
Yes; body composition and clinical context matter.
What should I do with the result?
Discuss concerns with a qualified healthcare professional rather than self-diagnosing.
Sources
Educational screening estimate only; not medical advice or a diagnosis.