How Long is 20 Inches? (with 10 Examples)

Understanding measurements can sometimes be a bit tricky, especially when we’re dealing with units that we don’t use in our daily lives. One such unit is the inch.

So, how long is 20 inches? Let’s dive into this topic and make it as clear as a sunny day.

20 Inches in the Metric System

For those more familiar with the metric system, 20 inches is equivalent to 50.8 centimeters. This conversion is straightforward because one inch is defined as 2.54 centimeters.

So, if you’re ever in a situation where you need to convert inches to centimeters, just remember this simple formula: the number of inches times 2.54 equals the length in centimeters.

Visualizing 20 Inches with Everyday Items

To help you visualize what 20 inches looks like, we’ve compiled a list of 10 common items that you can use as references.

1. Two Standard Rulers

A standard ruler is 12 inches long, so if you put two of them end-to-end, you’d have 24 inches. Now, imagine removing about 1/6th from the second ruler, and you’ve got yourself 20 inches!

2. Three Sheets of A4 Paper

A sheet of A4 paper is 11.7 inches long. If you line up two of them, you get 23.4 inches. Add half of another A4 sheet, and you’re pretty close to 20 inches.

3. Four and a Half Banknotes

The length of a US dollar bill is approximately 6.14 inches. So, if you line up about four and a half of them, you’ll get a length of around 20 inches.

4. A Guitar Neck

The neck of a standard guitar is usually around 24 to 25 inches long. If you imagine it a bit shorter, you’ll get a good idea of what 20 inches looks like.

5. A Medium-Sized Dog

The height of a medium-sized dog, like a Beagle or a Cocker Spaniel, from paw to shoulder is typically around 15 to 20 inches.

6. A Toddler’s Height

The average height of a 1-year-old child is approximately 20 inches. So, if you’ve ever seen a toddler taking their first steps, you’ve seen 20 inches in action!

7. Half the Width of a Standard Door

The standard width of a door in the US is around 36 to 38 inches. Half of that gives you a pretty good idea of what 20 inches looks like.

8. A Medium-Sized Television

The screen size of a television is measured diagonally. A medium-sized TV, around 20 inches, is perfect for a small room or kitchen.

9. A Large Pizza

A large pizza at most pizzerias measures 20 inches in diameter. So, if you’ve ever ordered a large pizza, you’ve seen 20 inches of deliciousness!

10. A Basketball Hoop

The diameter of a standard basketball hoop is 18 inches. Add a couple more inches, and you’ve got 20!

20 Inches Conversion Table

Understanding measurements can be a bit tricky, especially when we’re dealing with different units. Here’s a handy conversion table for 20 inches into various units:

How Long is 20 Inches? (with 10 Examples)
  • Feet: 20 inches is approximately 1.667 feet. In other words, it’s about 1 foot and 8 inches.
  • Yards: 20 inches is approximately 0.556 yards.
  • Miles: 20 inches is approximately 3.157 x 10^-4 miles.
  • Kilometers: 20 inches is approximately 5.08 x 10^-4 kilometers.
  • Decimeters: 20 inches is approximately 5.08 decimeters.
  • Centimeters: 20 inches is 50.8 centimeters.
  • Millimeters: 20 inches is 508 millimeters.

These conversions can help you visualize the length of 20 inches in different units. Remember, measurements are all around us, and understanding them can make our lives a lot easier. So, keep exploring, keep learning, and keep measuring!

Visualizing 20 Inches

So, how long is 20 inches? With the definition of an inch in mind, 20 inches equates to 508 millimeters (20 * 25.4). But let’s try to visualize this.

20 Inches in Everyday Items

To better comprehend the length of 20 inches, it can be helpful to compare it to common items. Here are a few examples:

  • The average length of a cat from its head to the base of its tail is about 18 inches. So, 20 inches is slightly longer than your average house cat.
  • A typical guitar has a length of about 38 to 39 inches. Therefore, 20 inches is just over half the length of a guitar.
  • A standard piece of A4 paper is 11.7 inches long, so 20 inches is a bit longer than the length of one and a half A4 sheets.

20 Inches in Human Anatomy

Human anatomy can also provide some good references for visualizing 20 inches:

  • The average adult male’s shoulder width is around 18 inches, so 20 inches is slightly more than the shoulder width of an adult male.
  • The average length of a baby at birth is around 20 inches.

20 Inches In the Animal Kingdom

In the animal kingdom, 20 inches is a significant measurement for various species.

  • The American Alligator: A baby American alligator is approximately 20 inches long at birth. These creatures grow up to 13 feet long on average, but when they first emerge from their eggs, they’re a manageable 20 inches.
  • The Giant Pacific Octopus: When stretched out, the tentacles of a juvenile Giant Pacific Octopus can reach about 20 inches. The adults, however, are much larger, with their tentacles reaching up to 14 feet!

20 Inches In the Plant World

Nature is full of wonders, and the plant world is no exception.

  • Sunflowers: On average, the diameter of a mature sunflower head can be around 20 inches. This measurement can vary significantly based on the specific variety and growing conditions, but some of the larger varieties can indeed produce such impressively sized flowers.
  • Rainforest Fungi: Some of the largest mushrooms found in rainforests can reach a cap diameter of 20 inches. These fungi, often found in the Amazon rainforest, are a vital part of the ecosystem, helping to break down organic matter and recycle nutrients.

20 Inches In the Sky Above

Even in the sky above, we can find references to our 20-inch measurement.

  • Rainbow: The average apparent width of a rainbow as observed from the ground is about 2 degrees, which translates to approximately 20 inches at an arm’s length. This means if you stretch out your arm towards a rainbow, the width of the rainbow would be about the length we’ve been discussing!


So, there you have it! A practical guide to understanding how long 20 inches is. The next time you come across this measurement, you’ll have a variety of everyday items to compare it to.

Remember, measurements are all around us, and understanding them can make our lives a lot easier. So, keep exploring, keep learning, and keep measuring!