Advanced BMI Calculator | Men, Women and Adult BMI

Adult BMI Calculator

Calculate your Body Mass Index using Imperial or Metric measurements. Choose the BMI calculator that fits your needs and get your BMI, weight category and healthy weight range in seconds.

Choose Your BMI Calculator

Select an option below. Only the calculator you choose will appear.

Which BMI calculator do you need?

BMI Calculator

Calculate adult BMI using your height and weight.

Weight
lbs
Height
ft
in
Age Optional
years

BMI Calculator for Men

Calculate adult BMI for men using standard BMI categories.

Weight
lbs
Height
ft
in
Age Optional
years

BMI Calculator for Women

Calculate adult BMI for women using standard BMI categories.

Weight
lbs
Height
ft
in
Age Optional
years

How the BMI Calculator Works

Body mass index compares body weight with height. For adults, BMI is a screening measure used alongside other health information. It does not directly measure body fat or distinguish between muscle, bone and fat.

Imperial BMI Formula

BMI = weight in pounds divided by height in inches squared, multiplied by 703

Metric BMI Formula

BMI = weight in kilograms divided by height in meters squared

The calculator converts your selected measurements before applying the appropriate BMI formula.

Adult BMI Categories

For adults age 20 and older, standard BMI categories use the same thresholds regardless of sex. The men and women options on this page make it easier to enter and view results for your intended use, but they do not apply different adult BMI thresholds.

BMI Category
Below 18.5 Underweight
18.5 to less than 25 Healthy Weight
25 to less than 30 Overweight
30 or greater Obesity
30 to less than 35 Class 1 Obesity
35 to less than 40 Class 2 Obesity
40 or greater Class 3 Obesity

Why Is Age Optional?

Age is useful information to record with a BMI result, but it is not required for the standard adult BMI formula. For adults 20 and older, the standard BMI categories are interpreted using the same thresholds regardless of age or sex.

Children and teenagers are different. BMI for people ages 2 through 19 is interpreted using BMI-for-age percentiles, which require age and sex. This page is designed for adult BMI calculations.

BMI Calculator for Men and Women

The men and women options provide separate calculator experiences without changing the standard adult BMI formula or category thresholds. Select the option matching the audience or calculation you want to perform.

BMI should not be treated as a diagnosis. Muscle mass, body composition, medical history and other health factors are not captured by BMI alone.

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Frequently Asked Questions

What measurements does this BMI calculator use?
You can calculate BMI using Imperial measurements with pounds, feet and inches, or Metric measurements with kilograms and centimeters.
Do I need to enter my age?
No. Age is optional for the adult BMI calculation. The standard adult BMI formula uses height and weight. Age is displayed with your result when entered.
Is the BMI formula different for men and women?
No. Standard adult BMI uses the same formula and category thresholds for men and women. The separate options make the calculator easier to use for different audiences.
What is a healthy BMI?
For adults, a BMI from 18.5 to less than 25 is classified as the healthy weight range under standard CDC adult BMI categories.
Does BMI measure body fat?
No. BMI estimates weight relative to height. It does not directly measure body fat and does not distinguish between muscle, bone and fat.
Can I use this calculator for children?
No. This calculator is designed for adults. Children and teenagers from ages 2 through 19 require BMI-for-age calculations using age and sex.
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