BMI Calculator (Metric)
Calculate Body Mass Index using kilograms and centimeters.
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Body Mass Index is a quick screening tool that uses your weight and height to estimate whether you fall into an underweight, normal, overweight or obese category. While BMI does not measure body fat directly, it is widely used by doctors and health organizations as a starting point. Enter your weight in kilograms and height in centimeters to calculate your BMI instantly.
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Frequently asked questions
BMI equals your weight in kilograms divided by your height in meters squared. For example, 70 kg and 1.75 m gives BMI = 70 / (1.75 x 1.75) = 22.9.
A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight and 30 or above is obese.
BMI can be misleading for muscular people because muscle weighs more than fat. A bodybuilder might have a high BMI despite low body fat. Use body fat percentage for a more complete picture.
Some research suggests a BMI of 25-27 may be healthiest for adults over 65. The standard ranges were developed primarily for younger adults.
Checking every few months is sufficient for most people. BMI is a trend indicator - small fluctuations week to week are normal and not meaningful.