BMITool · BMI & health guides

How Is BMI Calculated? BMI Formula Explained Simply

Learn how BMI is calculated using height and weight. See the metric and imperial BMI formulas and calculate your result with our BMI calculator.

How Is BMI Calculated? BMI Formula Explained Simply

BMI stands for Body Mass Index. It is a calculated measure of weight relative to height.

For metric measurements, the formula is:

BMI = weight in kilograms ÷ height in meters²

For example, if someone weighs 70 kg and is 1.75 meters tall:

70 ÷ (1.75 × 1.75) = approximately 22.9.

For imperial measurements, BMI can be calculated using pounds and inches:

BMI = weight in pounds × 703 ÷ height in inches²

The result is then compared with BMI categories. For adults, CDC lists below 18.5 as underweight, 18.5 to less than 25 as healthy weight, 25 to less than 30 as overweight, and 30 or greater as obesity.

BMI is a screening measure and does not directly measure body fat or diagnose a medical condition.

You do not need to calculate the equation manually.

Use our [BMI CALCULATOR] to enter your height and weight and receive the calculated BMI.

For related information, explore [BMI CHART] and [HEALTHY WEIGHT CALCULATOR].

Related BMI information

You can also use Open the BMI calculator and Read more helpful articles as part of your workflow.

Practical tips for better results

Before using How Is BMI Calculated? BMI Formula Explained Simply, check the original file or information carefully and decide what result you need. A clear starting point makes the process easier to manage and helps you avoid unnecessary changes. If you are working with an online utility, review the available options before processing your file so you can choose settings that match the task.

For regular workflows, keep your files organized and compare the result with the original after processing. This is particularly useful when quality, formatting, compatibility, or file size matters. If the first result is not ideal, adjust the available settings and try again rather than changing several things at once. The goal of a how is BMI calculated workflow is to save time while keeping the final result accurate and usable.