# Question: Why do we calculate BMI?

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Your BMI is a measurement that is a ratio of your weight and height. It’s a good way to gauge whether your weight is in healthy proportion to your height. In fact, knowing your BMI can help you – and your GP – determine any health risks you may face if it’s outside of the healthy range.

## What is the purpose of BMI?

BMI is a reliable indicator of body fatness for most people. It is used to screen for weight categories that may lead to health problems. This calculator provides BMI and the corresponding weight category.

## What is the BMI formula and why do we use it?

Fast facts on BMI:

BMI has been used to give an idea about whether people are overweight or underweight for over 100 years. It divides a person’s weight by their height squared. A BMI of between 18.5 and 24.99 is considered healthy, but some people are healthy with other BMIs.

## Is BMI a good indicator?

Reliable, affordable and accurate indicators of health status are important. BMI is easy to measure and provides a rough estimate of disease risk. But while it’s a good starting point, BMI needs to be used alongside other measurements to get a fuller picture of a person’s unique health risk.

## What is the BMI formula?

How is BMI calculated? With the metric system, the formula for BMI is weight in kilograms divided by height in meters squared. Because height is commonly measured in centimeters, divide height in centimeters by 100 to obtain height in meters.

## What is an ideal BMI for a woman?

A BMI of 18.5–24.9 is considered normal or healthy for most women. Even though healthcare professionals can use BMI as a screening tool, they shouldn’t use it as a method to evaluate a person’s body fat levels or health status ( 32 ).

## How do you calculate BMI manually?

Then, calculate BMI by dividing weight in pounds (lb) by height in inches (in) squared and multiplying by a conversion factor of 703. When using a handheld calculator, if your calculator has a square function, divide weight (lb) by height (in) squared, multiply by 703, and round to one decimal place.

## What is a good BMI?

For most adults, an ideal BMI is in the 18.5 to 24.9 range. For children and young people aged 2 to 18, the BMI calculation takes into account age and gender as well as height and weight. If your BMI is: below 18.5 – you’re in the underweight range.

## What does a BMI of 30 look like?

82.6 / (1.67 x 1.67) = 30

A BMI greater than 40 is considered morbidly obese; between 30-39.9 is considered obese; 25-29.9 is considered overweight; 18.5-24.9 is normal; and less than 18.5 is underweight.

## What is a better indicator than BMI?

Waist-to-height ratio (WHtR)

WHtR is more accurate than BMI because it takes central fat into consideration. Central fat is important because it collects around the organs in your midsection and has been closely linked to conditions such as heart disease.

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## Is WHR a better indicator than BMI?

WHR is an easy, inexpensive, and accurate way to see how much body fat you have. It can also help predict your risk for heart disease and diabetes. A few studies suggest that WHR is even more accurate than BMI for predicting the risks of cardiovascular disease and premature death .

## What is my ideal weight?

Weight and height guide chart

Height Weight
4ft 10″ (58″) 91 to 115 lbs. 119 to 138 lbs.
4ft 11″ (59″) 94 to 119 lbs. 124 to 143 lbs.
5ft (60″) 97 to 123 lbs. 128 to 148 lbs.
5ft 1″ (61″) 100 to 127 lbs. 132 to 153 lbs.