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BMI Calculator

Enter your height and weight. Your BMI and category appear instantly.

BMI
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Category (adults 20+)
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Healthy weight range
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Everything is calculated in this page. BMI is a screening measure, not a diagnosis. Talk to a healthcare provider about your health.

How to use

  1. 1. Choose unitsUS units (feet, inches, pounds) or metric (cm, kg).
  2. 2. Enter height and weightResults update as you type.
  3. 3. Read the resultYour BMI, category for adults, and the healthy weight range for your height.

BMI categories for adults

The U.S. Centers for Disease Control and Prevention (CDC) uses these categories for adults 20 and older. The World Health Organization (WHO) also defines overweight as a BMI of 25 or more and obesity as 30 or more.

BMICategory
Less than 18.5Underweight
18.5 to less than 25Healthy weight
25 to less than 30Overweight
30 to less than 35Obesity (class 1)
35 to less than 40Obesity (class 2)
40 or greaterObesity (class 3)

Sources: CDC – Adult BMI Categories, WHO – Obesity and overweight

How the healthy weight range is worked out

The range runs from the weight that gives a BMI of 18.5 up to just below the weight that gives a BMI of 25, for your height. For example, at 5 ft 7 in that is about 119 lb to 159 lb.

What BMI doesn’t tell you

The CDC notes that BMI is a screening measure and should be considered with other factors when assessing someone’s health. People with a lot of muscle can have a high BMI without excess fat.

Sources: CDC – Adult BMI Categories

FAQ

Who is this BMI calculator for?

It suits adults who want to see where a BMI from a checkup falls, people who want a sense of where they stand before changing their weight, anyone looking up the healthy weight range for their height, and people checking the numbers for an adult family member.

When is it useful?

For example, after you weigh yourself, to see whether you are inside the healthy weight range. Before or after a checkup, to look up your BMI and category quickly. Or when you are thinking about a target weight and want to see the healthy range for your height. The results update as you type.

What are the benefits of using it?

You get your BMI, your category and the healthy weight range for your height on one screen, in US units or metric. You don’t need to remember the formula, and there is no sign-up.

How is BMI calculated?

BMI is weight in kilograms divided by height in meters squared. In US units, pounds and inches are converted to kilograms and meters first.

What are the BMI categories?

For adults 20 and older, the CDC uses: under 18.5 underweight, 18.5 to under 25 healthy weight, 25 to under 30 overweight, and 30 or greater obesity (class 1, 2 and 3 at 30, 35 and 40).

How is the healthy weight range worked out?

It runs from the weight that gives a BMI of 18.5 up to just below the weight that gives a BMI of 25, for your height. In US units it is shown in whole pounds (about 119 lb to 159 lb at 5 ft 7 in); in metric it is shown to 0.1 kg, rounded inward.

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