12 Common Things That Are 21 Inches Long

Have you ever encountered something that’s 21 inches in size? If not, it’s time to learn what is! In this article, we’ll go over some of the most common items that measure exactly 21 inches – from everyday objects to specialized tools and equipment.

21 inches is approximately equal to 53 centimeters, which is close to 1 foot 9 inches.

Below, I have compiled a list of some commonly used things that are 21 inches or close to 21 inches. These can be used as a reference for comparison.

This should provide you with an idea of how big (or small) 21 inches is in relation to different objects and materials.

1. Two Sheets of Letter Paper

things that are 21 inches paper sheet

Letter-size paper is a standard size of paper that is commonly used for printing documents, correspondence, and other materials in the United States.

The size of letter size paper is 8.5 inches in width by 11 inches in length, so placing two letter-size papers end to end would result in a combined length of 21 inches.

2. Three No. 2 Pencils

How Long Is 13 Inches

No. 2 pencils are considered standard or medium-grade pencils and are suitable for most general writing and drawing needs.

The length of a No. 2 pencil can vary, but a typical length is about 7.5 inches. To measure an object that is 21 inches long, you will need approximately 3 No. 2 pencils laid end to end. It will be 1.5 inches bigger, but it can give you a good idea of about 21 inches.

This is the standard length for pencils that are made for writing and drawing.

3. 21 Standard Paperclips


Paper clips are usually made of steel or other metal, and are used by bending the clip into a loop and inserting it through the top of a stack of paper. The loop holds the papers together without damaging them, and can easily be removed by opening the loop and sliding it off the papers.

There are a variety of sizes and shapes of paper clips available, but the most common size is about 1 inch in length.

To reach the 21-inch mark, you would need approximately 21 standard paper clips.

Related: Things That Are 24 Inches Long

4. Two-thirds of a Footstep


The length of an individual’s footstep can be anywhere from 25-30 inches, depending on their height and whether they have suffered any permanent physical injuries. Men tend to take longer steps than women, with an average of 30 inches compared to 25 inches.

Measuring 21 inches is relatively simple when you use footsteps as your guide. For men, roughly two-thirds of a single step should equal 21 inches, while women will need around four-fifths of a step to measure 21 inches.

Using this method makes measuring effortless and allows for quick and accurate measurements. Whether you’re a man or a woman, using footsteps to measure 21 inches is the way to go!

5. Three and a Half Slim Soda Cans

Soda Cans

Slim soda cans are a type of beverage can that is narrower and taller than standard soda cans. They are often used for energy drinks, soda, and other beverages and are designed to be more portable and easier to hold than standard cans.

Standard soda cans usually come in two sizes: the conventional variety which is 4.83 inches tall and the taller, slimmer style measuring 6.125 inches in height.

To reach a height of 21 inches, you would need approximately 3.5 slim soda cans or around 4 regular soda cans. This is due to the slight difference in size between the two types of cans. Thus, you may need an additional can if using a standard can instead of a slim one.

6. 10.5 Large Binder Clips

binder clip

A “large” binder clip is a type of office supply that is used to hold papers together. Binder clips are typically made of metal and have two arms with grips on the end that can be squeezed together to hold papers securely.

Micro binder clips measure 0.5 inches in width, while mini binder clips are slightly larger at 0.6 inches wide. Small and medium binder clips measure 0.75 inches and 1.25 inches, respectively.

Measuring longer objects can be made easier by using large binder clips. Each clip is 2 inches wide, which means you will need approximately 10.5 of them to measure a 21-inch long object. This is an easy and efficient way of measuring objects without having to use any tools.

7. Three Common Butter Knives

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A butter knife is a type of flatware that is designed for spreading butter, jam, or other spreads on bread, toast, or other foods. Butter knives are typically made of stainless steel or other metals and have a long, thin blade with a rounded or pointed tip.

The length of a butter knife can vary, but a typical length is about 6 inches to 7 inches. To measure an object that is 21 inches long, you will need 3 butter knives laid end to end. This may be slightly longer or shy of 21 inches, but it will give you a good idea of how long 21 inches is.

8. Two American Footballs

american footbal

American footballs are oval in shape and are made of leather or synthetic materials. They are designed to be thrown, kicked, and carried by the players during a game.

These footballs have an egg-like shape and can bounce unpredictably when they hit the ground. The official size of football used in college play is between 10.5 and 11.5 inches when fully inflated, so it would take two of them to reach a length of 21 inches.

9. 43-inch TV’s Height

tv screen

In general, a 43-inch TV is a medium to large size TV that is suitable for use in a living room, bedroom, or other space where you want to watch movies, TV shows, or other video content. A 43-inch TV is typically about 24 inches to 36 inches tall, depending on the specific model and design.

If you have a 43-inch TV with an aspect ratio of 16:9, the height will be approximately 21 inches.

10. 21 Caps of Water Bottle

bottle cap

500-ml water bottle caps measure about 1 inch in diameter, so to reach 21 inches, you would need a total of 21 500-ml water bottle caps. This is a great way to measure something that’s 21 inches long without having to use any other objects, as all you need are the bottle caps.

11. Compact Mini Washing Machine

Compact Mini Washing Machine

The size of a compact washing machine can vary, but most compact washing machines are about 24 inches tall and 23 inches deep. So you can use its length and depth as well as a reference to measure something 21 inches. All you need to do is exclude 1 or 2 inches from the depth and length to reach the 21 inches.

This size is convenient for storing in a small space and is suitable for washing a few days’ worths of laundry at a time.

12. A Mini fridge

mini fridge

Mini fridges are typically smaller in size and capacity than full-size refrigerators and are designed to hold a limited amount of food and drinks.

The size of a mini fridge can vary, but most mini-fridges are about 20.5 inches tall, 1 to 2 feet wide, and 1 to 2 feet deep.

This makes it easy to measure objects that are around 21 inches in length since a mini fridge has a height of roughly 21 inches.

This size is convenient for storing a few days’ worths of food and drinks and is suitable for use in a small space, such as a dorm room or office.


As demonstrated, there are a variety of objects that can be used to measure something that is 21 inches in length. Letter-size paper, slim soda cans, a 43-inch TV, a mini fridge, a compact washing machine, and 500-ml water bottle caps are all objects that measure approximately 21 inches in length. Therefore, you can use any of these objects to measure other things that are around the same size.

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