# How Long is 8 Centimeters (Cms)?

The great thing about the metric system is that everything fits into each other so easily. For instance, 8 centimeters is the same as 80 millimeters, which is also the same as 0.00008 kilometers! In standard imperial, it’s about 3.15 inches.

While knowing the equivalents of 8 centimeters might be helpful, it won’t do you much when trying to figure out what it looks like. In this guide, I’ll describe 9 everyday objects that measure exactly or close to 8 centimeters.

## Book Ring

Book rings, which also go by the name binder rings, are the rings that keep loose sheets of paper together. They will sit along the inner spine of binders and come with clasps that you can open and shut at will. However, you can purchase a bundle of book rings and use them for all sorts of organization hacks.

If you take a look at our guide on book rings, you’ll find that they come in an assortment of sizes and shapes. One of the more common sizes is 3 inches in diameter, which is fairly close to 8 centimeters.

## Size 19 Rubber Band

Rubber bands are great for a million and one different things, including keeping things together and making humungous rubber band balls. If you take a look at a rubber band size chart, you’ll find that a size 19 rubber band will measure 3 inches long before stretching it out.

When shopping for rubber bands, there’s more to it than looking at their length and width. There are technical terms, such as ultimate elongation and specific gravity, that make finding the right rubber band a challenge. Or you can do what I do and just choose any size you think works best.

## 4 Pennies

A penny is equal to 1/100th of a dollar, which is why it’s also known as a cent. In fact, as Americans, we should refer to them as cents and not pennies since the term penny was the term used to describe the smallest coin denomination by our former colonizers! But that’s neither here nor there.

What’s important is the diameter of a penny. According to the US Mint, a penny measures precisely 19.05 millimeters or 1.905 centimeters. So, placing 4 pennies will just be 3.8 millimeters shy of 8 centimeters. Alternatively, you can go with 4 nickels since they’re so close to the cent in size.

## Pencil Case

Do you remember your first day of school when you would neatly organize all of your stationery in a pencil case? Then after the first week of school, you would forget about using the pencil case and just toss everything in your bag? Then after the first trimester, you would just borrow pens and pencils from your friends?

If you were one of those diligent students who had a pencil case with them at all times, you should know that it probably measured 3 inches wide before packing it full. Of course, the exact dimensions will depend on what pencil case model you had, which, if you’re as old as I am, is probably not even in production anymore.

## 6 Foam Boards

Foam boards are one of the most commonly used materials in arts and crafts. However, the squeaky noises they made when you rubbed two sheets together were cringe-inducing. I’m getting goosebumps just thinking about the sound!

The next time you take a stroll down the aisles of a local office supplies store, take a look at their selection of foam boards. The average foam board size will be between 1/8 and ½ an inch in thickness, so you would just 6 of the thickest boards stacked on top of each other to get a height of around 8 centimeters.

## Index Card

Index cards are great for all sorts of things, including wadding up into heavy paper basketballs and tossing them into the nearest wastebasket. However, index cards have a much more practical use, which is to write down bite-sized bits of knowledge for easy memorization.

The standard-sized index card will measure 5 inches long by 3 inches wide. All you need is to look at the width of a single index card, and you should have a pretty good idea of what 8 centimeters looks like. You could also use a flash card as a reference since they’re made of the same material and have identical sizes.

## Bic Lighter

When it comes to lighters, there’s one brand that most of us know about—Bic. Their lighters don’t come with high-tech features like plasma or electric lighters, and they’re pretty cheap at gas stations. If you plan on getting stranded on a desert island in the near future, make sure you pack at least a dozen Bic lighters.

If you take a look at Bic’s website, you’ll see that their lighters come in a wide variety of sizes. The standard pocket-size lighter dimensions are about 3.25 inches tall, which is just 0.1 inches beyond 8 centimeters.

## Pinback Button

A pinback button is a badge that you fasten to the front of your shirt with a built-in pin. These things are used to show your political affiliation or what organization or movement you support, or they can just be there to upgrade your style by a tiny fraction. Does anyone know why we don’t see as many pinback buttons as we used to?

Anyway, the typical diameter of a circular pinback button will be 3 inches, like many of the other items on this list. If the pin on your pinback button breaks, you can glue a magnet to its back and use it to decorate your fridge.

## Hand Sewing Needle

Everyone should know how to sew by hand. It’s a valuable skill that will help you mend your torn clothes, so you don’t have to hand over your hard-earned money to fashion brands to pick up a new set of clothes. Even if you know how to sew with a machine, you should still understand the fundamentals of sewing by hand, just in case your sewing machine breaks down.

The single most important tool for hand sewing is a sewing needle, which usually measures 3 inches long. When it comes to sewing, make sure you choose the right needle size since the needles are used for different fabric types.

BaronCooke

Baron Cooke has been writing and editing for 7 years. He grew up with an aptitude for geometry, statistics, and dimensions. He has a BA in construction management and also has studied civil infrastructure, engineering, and measurements. He is the head writer of measuringknowhow.com