BMI calculator (body mass index)
Enter height and weight. The tool gives the BMI and the WHO category for adults. It is a simple marker, not a diagnosis.
General information, not medical advice. This result does not replace a doctor. If in doubt or if you have symptoms, see a health professional.
Result
22.9BMI (kg/m²)
- WHO category: 18.5 to 24.9 (normal range)
- Weight at BMI 18.5 (kg)
- 56.7
- Weight at BMI 24.9 (kg)
- 76.3
Inputs
- Units
- cm and kg
- Height
- 175
- Weight
- 70
How it is calculated
BMI = weight in kg ÷ (height in m × height in m).
Result
BMI (kg/m²)
- Weight at BMI 18.5 (kg)
- 56.7
- Weight at BMI 24.9 (kg)
- 76.3
How it is calculated
- BMI = weight in kg ÷ (height in m × height in m).
- In feet and pounds we convert first: 1 inch = 2.54 cm, 1 pound = 0.4536 kg.
- WHO adult cut-offs: 18.5, 25, 30, 35, 40.
Example
1.75 m and 70 kg: 70 ÷ (1.75 × 1.75) = 22.9.
Good to know
- Adults only. For children, teens, pregnancy, very muscular people and older adults, ask a doctor.
- BMI does not tell muscle from fat and says nothing about a person’s health on its own.
- Cut-offs can differ by background (for example in Asia). A health professional can interpret the result.
Sources
- WHO, Obesity: preventing and managing the global epidemic (TRS 894, 2000)
When to use it
- Get a general adult BMI measure from height and weight.
Frequently asked questions
How is BMI calculated?
Weight in kilograms is divided by height in metres squared.
Can I use adult BMI categories for a child?
No. Children and teenagers need age- and sex-specific growth references to interpret BMI.
Can BMI diagnose a health problem?
No. It is a simple measure that cannot distinguish muscle from fat. Ask a health professional to interpret the result.