Overweight Calculator
Table of contents
What is the BMI of an overweight person? Definition of overweightObesity epidemic: Percentage of overweight in the USA and in other countriesOverweight calculator: How to determine your BMI and ponderal index with our toolFAQsWelcome to the overweight calculator, which you may also use as an obesity calculator. It is an extremely simple tool to calculate your BMI and ponderal index. If you ask yourself, "Am I overweight?" the calculator will also tell you whether you are underweight, within a normal weight range, overweight, or obese.
Keep reading to discover more! In this article, we will answer the following questions:
 What is the BMI of an overweight person?
 What percent of Americans are overweight?
 What is the ICD10 code for overweight?
 And much more!
💡 Do you want to know more about your health? Why don't you check out our basal energy expenditure calculator or the blood sugar converter for diabetes?
We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. If any health condition bothers you, consult a physician.
What is the BMI of an overweight person? Definition of overweight
Let's start from the beginning, shall we? What is the definition of overweight? As you can probably understand from the word itself, overweight is used to describe someone who weighs more than the normal range. Two of the main indicators of body mass are the BMI (body mass index) and the ponderal index (PI).
BMI
You have probably heard about the body mass index (BMI). It is calculated by dividing the weight by the square of the height. The former must be expressed in kilograms, while the latter, in meters.
BMI = weight [kg] / (height [m])²
Category  BMI 

Underweight  less than 18.5 
Healthy weight  18.525 
Overweight  2530 
Class 1 obesity  3035 
Class 2 obesity  3540 
Class 3 obesity  more than 40 
So, what is considered overweight? The BMI of an overweight person is between 25 and 30, while over 30, we have the obesity categories.
The formula is easy enough to calculate the BMI yourself, but when conversions come into play, it's easier to use our overweight calculator.
🙋 If you are not used to the metric system, you can also use our weight converter and our height converter.
Ponderal index (PI)
A less common way to determine whether someone is overweight is the ponderal index, often abbreviated in PI. According to a
, the ponderal index might arguably be a better indicator of body mass than BMI for children and adolescents.The ponderal index formula is different for children and adults.

Adults, adolescents, and children over the age of 6:
Divide the weight in kilograms by the cube of the height in meters.
PI = weight [kg] / (height [m])³
Category  PI 

Underweight  less than 11 
Normal weight  1115 
Overweight  1517 
Obese  more than 17 

Infants and children up to the age of 6:
Multiply the weight in grams by 100, then divide by the cube of the height in centimeters (or length in the case of newborns).
PI = weight [g] × 100 / (height [cm])³
Category  PI 

Underweight  less than 2.2 
Normal weight  2.23 
Overweight/Obese  more than 3 
Obesity epidemic: Percentage of overweight in the USA and in other countries
According to the
, the number of obese adults worldwide rose from 200 million to 300 million between 1995 and 2000. The data is concerning, as “obesity poses a major risk for serious dietrelated noncommunicable diseases, including diabetes mellitus, cardiovascular disease, hypertension and stroke, and certain forms of cancer”.These and other conditions caused by obesity reduce our quality of life.
Here are some facts and numbers about the percentage of overweight in the USA reported by
:
As of 2022, obesity rates in all 50 US states rose to over 20% (
). 
The South and the Midwest had higher obesity rates than the rest of the country (over 30%).

Around 42% of American adults are thought to have obesity, while 30.7% are overweight (
). 
Over 14.7 million children (20%) have obesity (
).
What percent of Americans are overweight?
According to a ranking by the
, the USA ranks 7^{th} (41.64%). In the first three places, we have the American Samoa (70.29%), Nauru (69.65%), and Tokelau (67.05%). At the end of the ranking, we find Rwanda (1.84%), West Timor (1.58%), and Ethiopia (1.1%).For comparison with other developed countries, France is 143^{rd} (10.18%), Canada is 50^{th} (28.16%), and Japan is 161^{st} (7.63%).
Overweight calculator: How to determine your BMI and ponderal index with our tool
Our obesity calculator is as simple as it can get!
If you are calculating the BMI and ponderal index for an adult, proceed as follows:

Input the weight. Remember to choose the right unit before inserting your data. You can do it by clicking on the unit field, which will open a dropdown menu.
In this example, we will input 150 lb (68.04 kg).

Input the height. Let's take 5.4 ft (1.646 m)

That's all! The overweight calculator will tell you your BMI and ponderal index, 25.1 and 15.3, respectively.
The tool will also let you know which categories your result falls in. In this case, both results fall into the overweight category.
If the calculation concerns a child or adolescent up to the age of 19, there are some additional features!

Select the checkbox at the top of the calculator.

Select the child or adolescent's sex.

Insert their weight and height, just like you would with an adult.
Let's take 26 lb (11.8 kg) and 2.6 ft (79.25 cm). The BMI will be displayed straight away: it is equal to 18.8, which is in the healthy weight category.

Because the formula differs based on age, you will have to insert the child or adolescent's age to see their ponderal index. The measurements we have input are typical of a 2 or 3yearold. Let's insert 2.
Now we know that this child's ponderal index is equal to 2.4. This is in the normal weight category.

Upon inserting the age, you will also be able to see how their BMI compares to the rest of the population their age in terms of percentiles.
In our example, the child is placed between the 90^{th} and 95^{th} percentile.
Now you know how to use the overweight calculator. What are you waiting for? Try it!
What percent of Americans are overweight?
According to the Centers for Disease Control and Prevention (CDC), approximately 42% of American adults are obese, while 30.7% are overweight.
For comparison, the UK has an obesity rate of 26.94%, China, 8.94%, and Brazil, 25.05% (World Obesity Federation).
What BMI is overweight?
Here are the different BMI categories:
 Underweight: less than 18.5;
 Normal weight: between 18.5 and 25;
 Overweight: between 25 and 30; and
 Obese: over 30.
Therefore, a BMI between 25 and 30 is considered overweight. If you want to use the ponderal index instead, the overweight range is 1517 for adults, adolescents, and children over the age of 6. For children under 6, there is a general overweight/obesity category, at a PI of over 3.
What is the ICD10 code for overweight?
Overweight belongs to the endocrine, nutritional, and metabolic diseases category, and its ICD10 code is E66.3. Other commonly used ICD10 obesity diagnosis codes are:
 E66.1 — druginduced obesity;
 E66.2 — severe obesity with alveolar hypoventilation;
 E66.8 — other obesity; and
 E66.9 — obesity, unspecified.
How do you calculate BMI?
Follow these steps to calculate your BMI:
 Take your weight expressed in kilograms.
 Take your height expressed in meters.
 Square your height.
 Divide your weight by the result of the previous step.
You have now determined your BMI. For reference, a normal BMI is between 18.5 and 25. Over 25 is what is considered overweight, and over 30, we have the obesity categories.