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Free BMI Calculator (Body Mass Index Calculator)

Calculate Your BMI & Body Weight

Instant BMI calculator
BMI calculator with height and weight, bmiindexcalculator.net

Online BMI Calculator - Free & Accurate

Get your result in seconds - no sign-up required

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accurate BMI calculator for adults, bmiindexcalculator.net

BMI calculator with height and weight

Our Body Mass Index calculator is designed for simplicity and accuracy.

BMI calculator with height and weight

What is BMI Calculator?

Illustration of a free online BMI calculator tool

Body Mass Index

Apply the formula

A BMI calculator helps you determine your Body Mass Index instantly using your height and weight.

Body Mass Index is a simple and widely used method to assess whether you are underweight, normal weight, overweight or obese.

BMI calculator designed for both men and women

BMI Formula in Practice

A BMI calculator works by using a simple formula that compares your weight to your height.

It takes your weight (in kilograms) and divides it by your height squared (in meters).

BMI weight categories chart showing underweight to obese ranges

Weight category

Once calculated, the result shows whether you are underweight, normal weight, overweight, or obese.

Underweight <18.5
Normal weight 18.5 - 24.9
Overweight 25 - 29.9
Obese >30
Step-by-step guide showing how to calculate BMI

How to calculate your BMI

Use BMI calculator to quickly and accurately determine your weight category and overall health status. Our free BMI calculator online helps you measure your Body Mass Index using a simple method based on your height and weight.

BMI 25 overweight or normal?