Educational estimate for adults, not medical advice, a diagnosis, or a treatment target. Review the method and limitations and discuss individual health questions with a qualified clinician.
Your result
How this calculation works
BMI = weight in kilograms รท height in meters squared.
Calculate body mass index for adults aged 20 and older. BMI is a screening measure, not an individual diagnosis or a measure of body composition.
How to use this calculator
- Enter or choose measurement system.
- Enter or choose height (cm or total inches).
- Enter or choose weight (kg or pounds).
- Enter or choose age (20+ only).
- Select Calculate and review the result and assumptions.
Worked example
An adult weighing 70 kg at a height of 175 cm has a BMI of approximately 22.86.
Assumptions and limitations
For adults aged 20+. Not a child growth assessment and not appropriate for interpreting pregnancy, muscle mass, or individual health on its own.
Formula references
Frequently asked questions
Is BMI a diagnosis?
No. It is one screening measure and does not directly measure body fat, muscle, or individual health.
Can children use this calculator?
No. Children and teens require age- and sex-specific growth-chart interpretation.