Body Mass Index (BMI) Calculator

Metric and US Customary units with WHO category classifications and target healthy weight.

Input Parameters

Height (cm)

Weight (kg)

Body Mass Index (BMI)

23.7Normal Weight (18.5 - 24.9)

Underweight (<18.5) (18.5)Normal Weight (18.5 - 24.9) (25)Overweight (25.0 - 29.9) (30)Class I Obesity (30.0 - 34.9)

Optimal Healthy Weight Target Range58.6 kg – 78.9 kg

Based on World Health Organization (WHO) and CDC global weight classifications.

175 available

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Body Mass Index estimates body fat from height and weight, with WHO categories and a healthy target range in metric and imperial units.

What is a healthy BMI?

18.5–24.9 for most adults; athletes with high muscle mass are a known exception.

BMI for children?

Children use age-and-sex percentiles, not adult cutoffs — this calculator targets adults.

BMI vs body fat percent?

BMI is a screening proxy; for actual fat share use the body fat calculator with tape measurements.