BMI Calculator

Body Mass Index — free and backed by scientific sources

Calculate your BMI instantly with World Health Organization (WHO) categories. Enter your weight and height in metric or imperial units.

Weight (kg)

Height (cm)

Sources

1
WHO — BMI Classification
World Health Organization. "Body mass index — BMI." Global Database on Body Mass Index.
2
PAHO — Overweight and Obesity
Pan American Health Organization. Data on overweight and obesity.
3
NIH — BMI Formula
National Heart, Lung, and Blood Institute (NIH). "Calculate Your Body Mass Index."

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How it is calculated

1Enter your weight in kilograms (or pounds for imperial).
2Enter your height in centimeters (or feet and inches).
3BMI is calculated as: BMI = weight (kg) ÷ height² (m).
4The result is classified using the WHO BMI categories.

Frequently asked questions

BMI calculator: how to calculate and interpret it

The Body Mass Index (BMI) relates a person's weight and height to classify nutritional status. It is the most widely used indicator by the WHO and public health services worldwide.

BMI formula

BMI = weight (kg) / height² (m). A person of 70 kg and 1.75 m has BMI = 70 / 3.0625 = 22.86. Ranges: underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), obese (≥30).

BMI limitations

Does not distinguish between muscle mass and body fat.
Athletes may have a high BMI without true obesity.
Does not consider fat distribution (abdominal vs. peripheral).
Ideal ranges vary by age, sex, and ethnicity.

BMI and cardiovascular risk

A BMI above 25 is associated with higher risk of type 2 diabetes, hypertension, and heart disease. Combine it with waist circumference for a more complete assessment and always consult a health professional.

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