BMI Calculator
Calculate your Body Mass Index using your height and weight with our free online BMI calculator.
Calculate Your BMI
Enter your height and weight below to calculate your BMI.
What Is BMI?
BMI, or Body Mass Index, is a number calculated from a person's weight and height. It is commonly used as a screening measure to place adults into broad weight categories.
BMI is not a direct measurement of body fat and does not by itself determine whether someone is healthy.
Adult BMI Categories
The standard adult BMI categories are commonly divided into the following ranges:
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 - 24.9 | Healthy Weight |
| 25.0 - 29.9 | Overweight |
| 30.0 or higher | Obesity |
How Is BMI Calculated?
When using pounds and inches, BMI can be calculated with this formula:
BMI = (Weight in pounds × 703) ÷ (Height in inches × Height in inches)
For example, a person weighing 170 pounds and measuring 70 inches tall would have a BMI of approximately 24.4.
Who Can Use a BMI Calculator?
This calculator is designed for general adult BMI estimates. It can be useful when learning about the standard BMI categories or tracking changes in height and weight.
Adults
Adults can use BMI as one general screening measure when considering weight-related information.
Students
Students can use the calculator when learning about BMI and basic health measurements.
General Fitness Tracking
People tracking general fitness information may use BMI alongside other measurements and information.
Limitations of BMI
BMI should not be treated as a complete measurement of a person's health.
BMI does not directly measure body fat, muscle mass, bone density, or where fat is stored in the body.
For example, someone with a high amount of muscle may have a higher BMI without having a high level of body fat.
Age, sex, muscle mass, medical history, and other factors can also matter when evaluating health.
Frequently Asked Questions
What does BMI stand for?
BMI stands for Body Mass Index. It is a calculation based on height and weight.
What is considered a normal BMI?
For adults, a BMI from 18.5 to 24.9 is commonly classified as the healthy-weight range.
Is BMI the same as body fat percentage?
No. BMI is calculated from height and weight. It does not directly measure body fat percentage.
Can children use this BMI calculator?
This calculator uses standard adult BMI categories. Children and teenagers require age- and sex-specific BMI interpretation, so this adult calculator should not be used to interpret their BMI.
Does muscle affect BMI?
Yes. BMI cannot distinguish between muscle and fat, so people with significant muscle mass may have a higher BMI.
Is this BMI calculator free?
Yes. The EverydaySolved BMI Calculator is free to use.
Can BMI determine whether I am healthy?
No. BMI is a screening measure and should not be used alone to determine an individual's health. A qualified healthcare professional can help interpret BMI together with other factors.