BMI Calculator
Units:
Weight:
lbs
Height:
ft
in
Calculate
About BMI Calculator
This BMI calculator is a tool created by our team at JustFit to help you determine your BMI based on your inputted numbers. That way, you can make informed decisions about your health and take appropriate steps to maintain a healthy weight!
What is BMI
Body Mass Index (BMI) is a way to determine if someone is in a healthy weight category for their height. The higher these numbers are, the higher the BMI is.
Here are the four main categories that you may fall under, based on your BMI:
Here are the four main categories that you may fall under, based on your BMI:
- Underweight: BMI is < 18.5
- Normal weight: BMI is 18.5 - 25.0
- Overweight: BMI is 25 - 30.0
- Obese: BMI is > 30
How Your BMI is Calculated
Calculating BMI is done using a BMI formula. It can calculate in both metric and imperial units, using a different set of formulas. Using guidelines from the Centers For Disease Control and Prevention (CDC), here is how to calculate your BMI if you are:
Using Imperial Units
Formula: weight (lb) / [height (in)]2 x 703Following the imperial unit system, you will use your weight in pounds (lb) divided by your height in inches (in) squared. This is followed by multiplying the numbers by 703, a conversion factor.Using Metric Units
Formula: weight (kg) / [height(m)]2Formula: weight (kg) / [height(cm)]2 x 10,000The formula is to use your weight in kilograms (kg) divided by your height in meters (m) squared. You may also use the alternative formula which measures your height in centimeters (cm) instead.
BMI Chart
Another way of finding your BMI level is to use a BMI Chart. You may refer to the chart below. Start by finding your weight (the closest number) first either in pounds or kilograms. Then, move down the column until you find the row that best represents your height in feet and inches or in meters. This will be an estimated number of your BMI.
height
weight
Limitations of BMI
While BMI is widely used and can be a useful indicator of whether you have a healthy weight, it has its own limitations.
As it is based on height and weight only, it is not an accurate measure of body fat content. It also doesn't take factors like muscle mass, bone density, age, gender, ethnicity and activity level into account. Thus, it can be useful as a screening tool for obesity but not a diagnostic measure for it.
As it is based on height and weight only, it is not an accurate measure of body fat content. It also doesn't take factors like muscle mass, bone density, age, gender, ethnicity and activity level into account. Thus, it can be useful as a screening tool for obesity but not a diagnostic measure for it.
BMI Calculator FAQ
Who should use BMI calculator?
Anyone that is aged 18 years old and older may use the BMI calculator. If you are looking to monitor your weight or understand if you are at risk for obesity, you may also use this tool. However, it's important to remember that this tool is not a replacement for professional medical advice.
Is BMI a reliable indicator of health?
It can be a useful indicator for categorizing people into the different weight categories but this does not mean that it is an accurate measure of health. It only provides a general idea of health risk that you may face.
Can BMI be used for children and teenagers?
Yes but for children and teenagers, BMI is age- and gender-specific and interpreted differently. Pediatric growth charts are normally used to determine a percentile ranking for BMI.
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