BMI Calculator UK

How Does the BMI Calculator Work?

1. Select the preferred unit type.
2. Enter your height in either feet and inches or in centimeters.
3. Enter your weight in either pounds or kilograms.
4. After inputting your height and weightpress the "Calculate" button.
5. The tool will return your body mass index (BMI) and its category. It also shows your health risk according to your BMI score.
6. For new BMI calculationspress the 'Reset' button.

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BMI Introduction

Body Mass Index (BMI) measures a person's body fat based on height and weight. It's a widely used metric for assessing a person's body weight relative to height.

By knowing your BMIyou can better understand your health status and make a change in your lifedietand physical activity.

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How is BMI Calculated?

The BMI is calculated using the following formulas:

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BMI Categories

Here's a detailed breakdown of BMI used for men and womenaged 20 or older.

BMI Category	BMI Range (kg/m2)	Health Risk
Underweight	Below 18.5	Malnutrition Risk
Normal Weight	18.5 - 24.9	Low Risk
Overweight	25 - 29.9	Enchanced Risk
Moderately Obese	30 - 34.9	Medium Risk
Severely Obese	35 - 39.9	High Risk
Very Severely Obese	40 or Higher	Very High Risk

BMI categories for kids or children (Age < 20).

BMI Category	BMI Percentile (kg/m2)	Health Risk
Underweight	Less than 5th percentile	Malnutrition Risk
Normal Weight	5th percentile to less than 85th percentile	Low Risk
Overweight	85th percentile to less than 95th percentile	Enchanced Risk
Obese	95th percentile and greater	High Risk

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BMI Chart