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BMI Calculator

BMI Calculator

BMI Calculator for males and females quickly calculates your BMI (Body Mass Index). Simply enter your weight and height in the calculator below to find out if your BMI score. 

What should your BMI be for your age?

According to the National Institutes of Health (NIH) a BMI of less than 18 usually means a person is underweight.

If your BMI is between 18 and 25, you’re usually in the healthy range. Overweight is usually 25 to 30. A BMI over 30 usually indicates obesity.

How do we calculate your BMI?

Our BMI Calculator uses the imperial BMI formula.

Here is the formula we use to calculate your metrics:

The Imperial BMI Formula

Weight (lbs) x 703 ÷ Height (inches²)

Is BMI accurate?

The thing about measuring your body mass index is this:

There’s no ideal healthy body for every man or woman. That’s why it’s best to regularly calculate and stay on top of all of your numbers. BMI is just one.

If you’re very tall or muscular, BMI is not great for you. You may find our Calories Calculator and Vo2 Max Calculator more helpful.

What’s the problem with a BMI Calculator?

Doctors and other medical professionals often use BMI because it’s a quick and easy calculation. Our BMI Calculator makes it even quicker and easier.

The problem? While it does take into account your height, unlike just weighing yourself on a scale, it does not calculate the following:

  • body fat percentage distribution
  • muscle mass distribution
  • waist-to-hip ratios


Calories Calculator

VO2 Max Calculator