Teens BMI Calculator

Teens BMI Calculator


Unit of measurement *



Do you want to know if your teenager’s weight is healthy? Look no further! This calculator will determine your teenager’s BMI, or “Body Mass Index.” It’s like a report card for your body, but without the stress of actual grades!


BMI is a formula that measures body fat based on height and weight. Here’s the code formula for teens:

BMI = weight(kg) / height(m)²

Categories and Interpretation

Check out this table to see where your teen falls on the BMI scale:

BMI Category Interpretation
<18.5 Underweight Uh-oh, it’s time to bulk up!
18.5-24.9 Normal Looking good, keep it up!
25-29.9 Overweight Time to hit the gym or try a new sport!
>30 Obese Let’s work together to make some healthier choices.

Examples of Calculations

Here are some examples of different teens and their BMIs. We promise, this is a fun table!

Name Age Weight (lbs) Height (in) BMI (lbs/in²) Interpretation
John 14 130 64 22.3 Normal
Sarah 16 115 62 21.0 Normal
Bob 15 185 70 26.5 Overweight
Emily 13 95 59 19.2 Normal

Methods of Calculations

There are different ways to calculate BMI. Here are some methods and their advantages, disadvantages, and accuracy levels:

Method Advantages Disadvantages Accuracy
Formula Simple and easy to use Doesn’t account for muscle mass or bone density Moderate
Skinfold Thickness Accounts for fat distribution Requires trained personnel and can be uncomfortable High
Bioelectrical Impedance Non-invasive Can be affected by hydration levels Moderate
Dual-energy X-ray Absorptiometry (DXA) Accounts for bone density and muscle mass Expensive and exposes patient to radiation High

Evolution of BMI Calculation

The concept of BMI calculation has evolved over time. Check out this table to see how:

Year BMI Developments
1830s Adolphe Quetelet created the formula for “Quetelet Index”
1972 The term “Body Mass Index” was coined
1998 BMI became the standard measure for obesity by the World Health Organization

Limitations of BMI Calculation

While BMI is a useful tool, there are limitations to its accuracy. Here are some bullet points to highlight those limitations:

  • Not accounting for muscle mass or bone densityNot accounting for variations in body typeNot accounting for age or sex differences

Alternative Methods

If you’re not a fan of BMI, here are some alternative methods:

Method Pros Cons
Waist Circumference Accounts for abdominal fat Doesn’t account for muscle mass or bone density
Body Fat Percentage Accounts for overall fat distribution Requires special equipment and can be expensive
Waist-to-Hip Ratio Accounts for fat distribution Doesn’t account for muscle mass or bone density


Here are some FAQs on BMI:

1. What is BMI? BMI stands for Body Mass Index. It is a formula that measures body fat based on height and weight.

2. What is a healthy BMI for teens? A healthy BMI for teens is between 18.5 and 24.9.

3. How is BMI calculated for teens? BMI is calculated by dividing weight (kg) by height (m)².

4. Does BMI account for muscle mass? No, BMI does not account for muscle mass.

5. Can BMI be inaccurate for athletes? Yes, BMI can be inaccurate for athletes due to their high muscle mass.

6. Should BMI be the only factor considered for weight management? No, BMI should be considered along with other factors such as age, sex, and overall health.

7. What is considered overweight or obese according to BMI? A BMI of 25 or above is considered overweight, and a BMI of 30 or above is considered obese.

8. Is BMI a reliable measure of body fat? BMI is a useful tool, but it has limitations to its accuracy.

9. Can BMI be used for children and teens? Yes, BMI can be used for children and teens, but the interpretation differs from adults.

10. Where can I find more information on BMI? You can find more information on BMI at reliable government and educational websites.


Here are some reliable government and educational resources on BMI:

These websites provide information on how to calculate BMI, healthy weight ranges, and tips for maintaining a healthy weight.