BMI Calculator

Use our free BMI calculator for both women and men to check your BMI (Body Mass Index) and see whether your weight is healthy for your length. We have a calculator for both the imperial and metric system.

BMI Calculator (Imperial System)

BMI Calculator (Imperial System)

BMI Calculator (Metric System)

BMI Calculator (Metric System)


  • This calculator should not be used to measure BMI for:
    • Someone under 18 years old.
    • Pregnant women.
    • Someone with a eating disorder or condition that affects their height.
  • Our terms and conditions also apply to this calculator.
  • The BMI is a helpful indicator of your body weight, but it does have some limitations:
    • It does not take your body composition into account.
    • It does not give you an indication of excess body fat, only of excess body weight.
    • So be sure to use your BMI alongside other measurements, like waist-to-height ratio or waist circumference.

Your Results

The World Health Organization (WHO) recommends a certain BMI range for adults. The classifications are as follows:

ClassificationBMI Range
Severe Thinness< 16
Moderate Thinness16 – 17
Mild Thinness17 – 18.5
Normal18.5 – 25
Overweight25 – 30
Obese Class I30 – 35
Obese Class II35 – 40
Obese Class III> 40

Based on the recommendations from the WHO, a BMI between 18.5 and 25 is considered healthy. Anything above 25 is considered overweight, with a BMI over 30 being obese. Conversely, a BMI below 18.5 is considered underweight.

Why is it Important to Know Your BMI?

Your BMI (Body Mass Index) is a good way to check your risk of diseases related to excess body fat. Being overweight or obese increases your mortality risk and increases the chances of dangerous diseases or conditions. Generally, the higher your BMI, the greater the risk of developing chronic diseases, like:

  • Stroke
  • High blood pressure
  • Type II diabetes
  • Coronary heart disease
  • Cardiovascular disease