⚖️ BMI Calculator

Calculate your Body Mass Index instantly. Enter your weight and height to find out if you are at a healthy weight.

Weight (kg) Height (cm)

UnderweightNormalOverweightObese

Enter your weight and height

BMI Categories

BMI	Category
Below 18.5	Underweight
18.5 – 24.9	Normal weight ✓
25 – 29.9	Overweight
30 or above	Obese

Frequently asked questions

Is BMI accurate?

BMI is a useful screening tool but does not measure body fat directly. Very muscular people may have a high BMI without excess fat. For a complete assessment consult a doctor.

What is a healthy BMI?

A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight and above 25 is overweight.

How is BMI calculated?

BMI = weight (kg) ÷ height² (m). For example, a person weighing 70 kg and 1.75 m tall has a BMI of 70 ÷ (1.75 × 1.75) = 22.9.

About the BMI Calculator

The Body Mass Index (BMI) calculator is one of the most widely used tools in medicine and nutrition to quickly assess whether a person's weight is appropriate for their height. It was developed by Belgian mathematician Adolphe Quetelet in the 19th century and has been the standard screening tool used by healthcare professionals worldwide ever since.

Our free BMI calculator gives you an instant result with no registration required. Simply enter your weight in kilograms and your height in centimetres to get your BMI value and find out which category you fall into according to the World Health Organization (WHO) guidelines.

While BMI is a useful tool, it does have limitations. It does not account for muscle mass, bone density, age or ethnic differences. Athletes and very muscular people may have a high BMI without excess body fat. Always consult a healthcare professional for a complete health assessment.