SuperCalc

BMI Calculator (Metric)

Enter your weight in kilograms and height in centimeters to instantly calculate your BMI. The metric system is the international standard used by the WHO and most healthcare systems worldwide. Your result includes a visual gauge, your BMI category, healthy weight range, and BMI Prime value.

BMI Calculator

Enter your height and weight to calculate your Body Mass Index.

cm
kg

BMI Categories

WHO classification of Body Mass Index ranges.

CategoryBMI Range
Underweight
< 18.5
Normal
18.5 – 24.9
Overweight
25 – 29.9
Obese I
30 – 34.9
Obese II
35 – 39.9
Obese III
40+

Frequently Asked Questions

What is the BMI formula in metric units?
BMI = weight (kg) / height (m)^2. For example, a person weighing 70 kg and standing 175 cm tall: BMI = 70 / (1.75)^2 = 70 / 3.0625 = 22.9.
Why is metric the standard for BMI?
The BMI formula was originally defined by Adolphe Quetelet in the 1830s using metric units. The WHO, NHS, and most international health organizations use metric. The imperial conversion (lbs and inches) requires a multiplication factor of 703 to produce the same result.
What's a healthy BMI range?
18.5 to 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. These are population-level guidelines — individual health depends on many more factors including body composition, activity level, and genetics.

Medical disclaimer: BMI is a screening tool, not a medical diagnosis. It does not measure body fat directly and does not account for muscle mass, bone density, age, sex, or ethnicity. Consult a healthcare provider for personalized health advice.

Related BMI topics

Other tools you might like