Weight Percentile Calculator

Category: Fitness
- September 06, 2025
| |

Calculate weight percentile based on age, gender, and weight measurements. This calculator uses WHO and CDC growth standards.

Weight Percentile Calculator

Options

About Weight Percentiles

Weight percentiles help determine how a person's weight compares to others of the same age and gender.

Understanding Percentiles

A percentile indicates the percentage of the reference population that your measurement falls below:

  • 50th percentile: Average weight (median)
  • Below 5th percentile: May indicate underweight
  • Above 95th percentile: May indicate overweight
Growth Standards

This calculator uses two widely recognised growth standards:

  • WHO: World Health Organization standards (international reference)
  • CDC: Centers for Disease Control standards (US reference population)
Z-Scores

Z-scores (standard deviation scores) measure how far a measurement is from the mean:

  • Z-score of 0 = 50th percentile (average)
  • Z-score of +1 ≈ 84th percentile
  • Z-score of +2 ≈ 97.7th percentile
  • Z-score of -1 ≈ 16th percentile
  • Z-score of -2 ≈ 2.3rd percentile
Important Notes
  • This calculator provides estimates based on statistical data and should not replace professional medical advice.
  • Individual growth patterns can vary significantly and should be monitored over time.
  • Always consult with a healthcare provider for concerns about weight or growth.

What Is the Weight Percentile Calculator?

The Weight Percentile Calculator helps you find out how your weight compares to others in your age and gender group. It's a handy tool for parents, teens, and adults who want to understand their growth patterns better. By inputting your weight, age, and gender, you can see where you stand on the growth charts created by the World Health Organization (WHO) and the Centers for Disease Control (CDC).

Why Use This Calculator?

This calculator is useful for several reasons. It gives you insights into your weight status and overall health. Here are some key benefits:

  • Understand if you’re in a healthy weight range.
  • Identify if you may be underweight or overweight.
  • Track changes in weight over time.

Who Can Benefit from It?

The Weight Percentile Calculator is designed for anyone looking to assess their weight. This includes infants, children, teens, and adults. Parents can use it to keep track of their child's growth, while adults can monitor their own health. It’s suitable for anyone who wants to make informed decisions about their weight.

How to Use the Weight Percentile Calculator

Using the calculator is straightforward. You'll need to enter your gender, age category, and weight. Based on this information, the calculator will provide your weight percentile and Z-score. It’s important to select the right age category: infants (0-36 months), children/teens (2-20 years), or adults (20 years and older).

Understanding Weight Percentiles

Weight percentiles show how your weight compares to a reference group. Here’s a simple breakdown:

  • 50th percentile: This is the average weight for your group.
  • Below 5th percentile: This may suggest you're underweight.
  • Above 95th percentile: This may indicate you're overweight.

Growth Standards Used in the Calculator

The Weight Percentile Calculator relies on two trusted growth standards. These are:

  • WHO: The World Health Organization's international growth standards.
  • CDC: The Centers for Disease Control's standards which reflect the US population.

This combination ensures accuracy and reliability in your results.

Interpreting Your Results

After you calculate your weight percentile, you'll get a result that includes both your percentile and your Z-score. The Z-score tells you how your weight deviates from the average weight. A Z-score of 0 means you're at the average weight for your age and gender. Higher or lower Z-scores indicate how far you are from this average.

Important Notes on Health and Growth

While the Weight Percentile Calculator provides valuable information, it's essential to remember that it should not replace medical advice. Individual growth patterns vary widely, so it's best to consult a healthcare provider if you have concerns about weight or overall health. Regular check-ups are important for tracking growth and ensuring a healthy lifestyle.