YDS Medical Tools

Free BMI Calculator

Calculate your Body Mass Index (BMI) instantly and check whether your weight falls within a healthy range.

0.00
-
UnderNormalOverObese IObese II+
Healthy Weight Range
-
BMI Formula
Weight(kg) ÷ Height²(m)
-
BMI Body Mass Index illustration showing underweight, normal, overweight and obese categories on a scale

What is BMI?

Body Mass Index (BMI) is a screening measurement that uses your height and weight to estimate whether you have a healthy amount of body fat. It's calculated by dividing your weight in kilograms by the square of your height in meters, giving a single number that can be compared against standard weight categories.

Why BMI Matters

BMI is widely used by doctors and health organizations as a quick, low-cost way to flag potential weight-related health risks. A BMI outside the normal range can be associated with a higher risk of conditions such as heart disease, type 2 diabetes, and high blood pressure, making it a useful first step in a broader health conversation.

BMI Limitations

Tips for Maintaining a Healthy Weight

Frequently Asked Questions