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Health calculator · Adults
BMI Calculator
Calculate body mass index in metric or imperial units, understand the adult screening category, and see the weight range associated with your height.
Measurements stay in this browser
Your measurements
For adults aged 20 and older
BMI is a screening measure, not a diagnosis. It may be less informative during pregnancy or for people with high muscle mass, and children need age-specific percentiles.
Your body mass index
22.9
kg/m²
Adult BMI scale
Healthy-weight range
1418.5253040+
Screening category
Healthy-weight range
Adult range: 18.5 to 24.9
Range for this height
56.7–76.3 kg
Corresponds to BMI 18.5–24.9
Use this as a starting point and discuss health concerns or unexpected results with a qualified healthcare professional.
Adult categories follow CDC guidance. BMI should be considered alongside other health factors.
How it works
A quick calculation with the right context.
BMI is simple arithmetic, but interpreting it responsibly matters. This workspace keeps the formula transparent and the limitations visible.
- 01
Choose your units
Use kilograms and centimetres or pounds, feet, and inches. Switching units converts the current measurements for you.
- 02
Enter height and weight
The result updates immediately and shows the BMI formula using the measurements you entered.
- 03
Read it as a screening result
Review the adult category and estimated healthy-weight range while remembering that BMI is not a diagnosis.
Built for clarity
More useful than a bare BMI number.
Useful context
See the adult BMI category, distance to the healthy range, and a height-specific weight range.
Responsible interpretation
Clear adult-only guidance explains where BMI is useful and where individual health assessment matters.
BMI questions
Understand the result before using it.
How is BMI calculated?+
BMI divides weight in kilograms by height in metres squared. In US customary units, pounds are divided by inches squared and multiplied by 703.
What is a healthy adult BMI range?+
Standard adult screening categories define 18.5 to less than 25 as the healthy-weight range, 25 to less than 30 as overweight, and 30 or more as obesity.
Is BMI a diagnosis?+
No. BMI is a screening measure. It does not directly measure body fat or account for factors such as muscle mass, body composition, pregnancy, or individual health history.
Can this calculator be used for children?+
No. Children and teenagers require age- and sex-specific BMI percentiles. This calculator is intended for adults aged 20 and older.
Why does the calculator show a weight range?+
It applies the adult BMI screening range of 18.5 to 24.9 to the entered height. It is context for the calculation, not an individual treatment target.
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