BMI Calculator

BMI Calculator

Height (in inches or cm):
Weight (in pounds or kg):
Use Metric?:
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BMI Formula:

BMI = (weight * 703) / height²

BMI Definition

Our free online BMI calculator makes it easy for anyone to calculate BMI with just a few keystrokes. Enter in your height and weight and press the calculate BMI button – that’s all there is to it! Calculating Body Mass Index is useful for determining the amount of body fat that you may have. Get started learning how to calculate BMI right now and then be sure to use all of our other health calculators!

Below 18.5 Underweight
18.5 – 24.9 Normal
25.0 – 29.9 Overweight
30.0 and Above Obese

How to Calculate BMI

Let's be honest - sometimes the best bmi calculator is the one that is easy to use and doesn't require us to even know what the bmi formula is in the first place! But if you want to know the exact formula for calculating bmi then please check out the "Formula" box above.

Add a Free BMI Calculator Widget to Your Site!

You can get a free online bmi calculator for your website and you don't even have to download the bmi calculator - you can just copy and paste! The bmi calculator exactly as you see it above is 100% free for you to use. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Click the "Customize" button above to learn more!