How To Calculate BMI

What is BMI? (Body Mass Index)

How To Calculate BMI (Body Mass Index). Body Mass Index (BMI) is a measure that uses your height and weight to work out if you have a healthy weight. 

The calculation to work out BMI divides an adult’s weight in kilograms by their height in metres squared.

A Range of 18.5 to 24.9 BMI is ideal for most adults 

If your BMI is:

  • below 18.5 – you are in the underweight range
  • if between 18.5 and 24.9 – you are in the healthy weight range
  • or between 25 and 29.9 – you are in the overweight range
  • and between 30 and 39.9 – you are in the obese range 

Calculate your BMI with our free BMI Calculator below.

How To Calculate BMI

Your New Foods BMI Calculator

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Your BMI is……

less than 18.5:Underweight
18.5 – 24.9:Normal weight
25 – 29.9:Overweight
30 – 34.9:Class I Obese
35 – 39.9:Class II Obese
40 upwards:Class III Obese


Before using the data obtained using this calculator, please consult with a doctor.


Is BMI an Accurate Measurement?

To get a healthy weight range for a particular height, BMI takes into account natural variations in body shape.

Other Factors are also taken into account when assessing if you are a healthy weight, as well measuring your BMI. 

Because muscle is much denser and therefore, heavier than fat, very muscular people, such as athletes, weight trainers and heavyweight boxers, may be a healthy weight even though their BMI is classed as obese.

How To Calculate BMI

Wooden mannequin depicting bmi instead of human body

How To Calculate BMI

Who should not use a BMI calculator

Because BMI does not differentiate between muscle and fat, BMI is not used for young Children as they are still developing. Athletes and bodybuilders as they may not be at risk despite having a high BMI, pregnant women as the body composition changes and the elderly as muscle reduces with age. 

We have a range of free calculators for you to use including, Body Fat Calculator, Length and Height Calculator, Weight Calculator and  the Water Intake Calculator. Follow this link to use these calculators free of charge.  

You will also find other helpful calculators here including Temperature, Time, Area and Speed.

Other Useful Pages

Why not check out our recent posts here. These posts relate to different types of diet and healthy eating plans. These cover Keto Diets, Vegan Diets and Paleo Diets.

You will also find Keto breads and desserts which you can eat on the Keto or Paleo Diet. All of the Keto bread recipes are gluten-free and low carb. Most of the Keto Breads recipes in the cookbook are also dairy-free.

There is a lot of choice out there so we have put together the most popular in one place. Our aim is to give you all the information that you need and to have it in one place. This will help you to make the choice that is right for you.

Use the link to take you to the Recent Blog page where you will find all the latest posts.

You will also find a list of useful Kitchen accessories under the ‘Really useful stuff’ heading. You can either follow this link or use the heading at the top of the page. Here you will find convenient links to the products shown.

Some of these items are everyday items for your Kitchen. You will also find that some that are not everyday items. However, these will make life easier when following the recipes in the plans and diets we have put together.

You can also use this link to go to our useful calculator page. Here you will find calculators there to convert length, distance, area, temperature, time and weight. You can use them as often as you like as they are free of charge. Please also feel free to share them with your friends via the social media links. This is also free of charge.

[We may earn money or receive products from the companies mentioned in this post. This will not affect the price of the product. Medical Disclaimer: All the calculators on this website are for information only. You should talk with your medical professional when seeking advice about a medical condition, new diet, exercise program, or any information gained from this website and its tools/calculators.]