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BMI Calculator

Know your number.
Understand the context.

Enter your height and weight for an instant BMI result. No account, no stored measurements.

01 / Measure

Calculate your BMI

Runs in your browser

lbs
ft
in

02 / Interpret

A quick adult BMI reference

These standard categories apply to most adults aged 20 and older.

UnderweightBelow 18.5
Healthy range18.5 to 24.9
Overweight25.0 to 29.9
Obesity range30.0 or higher

03 / Use it well

BMI is a starting point, not a diagnosis.

BMI does not directly measure body fat or distinguish fat from muscle. Pregnancy, ageing, athletic builds, and some ethnic backgrounds can also change how a result should be interpreted.

Read about BMI limitations

Next useful step

Go deeper only when you need to

Healthy weight by heightReference ranges in kg and lb How BMI worksFormula, meaning, and origins More health calculatorsBMR, TDEE, body fat, and more

Common questions

BMI, without the filler

What is a healthy BMI for adults?

For most adults aged 20 and older, the standard healthy BMI range is 18.5 to 24.9. BMI is a screening measure, not a diagnosis, and it does not account for muscle mass, pregnancy, body-fat distribution, or every age and ethnic group.

How is BMI calculated?

Metric BMI is weight in kilograms divided by height in metres squared. Imperial BMI is weight in pounds multiplied by 703, divided by height in inches squared.

Does BMI work for children and teenagers?

Ages 2 to 19 require age- and sex-specific growth percentiles. Fixed adult categories should not be used for children or teenagers.

Is BMI an accurate measure of health?

The formula is accurate for height and weight, but BMI cannot measure body fat or overall health. Consider it alongside waist circumference, medical history, fitness, and advice from a qualified clinician.