About this Calculator
Body Mass Index (BMI) is a simple, internationally recognized screening parameter used to estimate biological body fat based on a person’s height and weight. It is widely used by clinicians to evaluate body weight categories for adults.
Formula & Calculations
Mathematical Formula
BMI = Weight (kg) / [Height (m)]²
- Weight: Measured in kilograms (kg) or pounds (lbs).
- Height: Measured in meters (m) or inches (in).
How to Calculate Step-by-Step
1
Measure parameters
Gather height in meters and weight in kg.
2
Square height
Multiply height in meters by itself.
3
Divide
Divide weight in kilograms by the squared height value.
How to Use & Best Practices
Select your unit system (Metric or Imperial), input your age and gender, and then drag the sliders to see your BMI score instantly.
Frequently Asked Questions
Why doesn't BMI work well for athletes?
BMI is unable to distinguish between dense muscle tissue and fatty tissue, occasionally categorizing bodybuilders as overweight.
What are the limitations of BMI?
It ignores subcutaneous vs visceral fat levels and muscle percentage.