How Big Is 4 Centimeters Compared To Common Objects?

By Measurement Of TeamILast update - Jun 30, 2024I6 Min Read
How Big Is 4 Centimeters Compared To Common Objects

Ever wondered just how big 4 centimeters really is? Pretty sure you did, which is why you are here. And we are here to give you some real life 4-centimeter object references, so next time you don't have to wonder about this measurement.

How Long Is 4 cm?

Inches are mostly used to measure small things. But sometimes, you probably will need to measure something even smaller, then centimeters or millimeters become your go-to measuring units.

However, centimeters are not used in all countries. So, you should know how this measurement goes up with other units if you need to convert or use our inch to centimeter calculator.

When we convert 4 cm into inches, it amounts to approximately 1.57 inches. So if you were measuring it on a ruler marked in inches, it would be over an inch and a half.

Then we have millimeters (mm), smaller than centimeters, used in precise work like engineering or crafting. Converting 4 cm to millimeters, it is equivalent to 40 mm.

For slightly longer distances, we usually use feet, i.g. for height or measurement of room. Four centimeters is just a tiny fraction of a foot. To be exact, it's about 0.131 feet. You can get this using our cm to feet converter.

4 cm = 0.04meter = 40 mm = 0.131 feet = 1.57 inches

Objects That Are 4 Centimeters

With a ruler, we can estimate how big is 4 centimeters. But we don't always carry a ruler with us. In such situations, references can be more than enough.

Hence, we've made a list of everyday objects to better visualize 4 cm:

  1. Two US Nickels
  2. 3 Aspirin Tablets
  3. Height of 33 Compact Discs
  4. Length of Two Safety Pins
  5. Diameter of 4 AAA Batteries
  6. Apple AirPods
  7. Two Lego Bricks

1. Two US Nickels

Image by gaustin11 from Pixabay

Let's start with the most common items you'll find any time near you, US nickels. The size of a USA nickel is approximately 0.835 inches (21.21 mm) in diameter.

In centimeters, its diameter is approximately 2.12 cm, almost half of 4 centimeters.

If we're talking about two nickels, their combined diameter would be approximately 1.67 inches. In centimeters, their combined diameter would be approximately 4.24 centimeters.

While not exactly four centimeters, two nickels can help you get an idea of how long 4 cm is.

2. Three Aspirin Tablets

Image by Anna Shvets from Pexels

Another everyday item is aspirin, which we all are familiar with. Those small pills we often take for headaches or pains. They're very common and can be found in many medicine cabinets.

Aspirins typically measure around 1.40 centimeters in diameter, which is about one-third of four centimeters.

So, if you place three aspirin tablets side by side, their combined length would be roughly 4 cm. That is very close to our estimations!

Aspirin tablets are one of the most common medicines in the world. They're widely used to relieve various types of pain, reduce fever, and even prevent heart attacks and strokes when taken regularly.

3. Height of 33 Compact Discs

Image by Mahesh Patel from Pixabay

CDs, or compact discs, were once a staple in households worldwide for storing and playing music, movies, and other digital content. 

According to Britannica, a CD has a thickness of about 1.2mm. Now, visualize stacking up 33 CDs. It's not hard to imagine if you are from that era, right? The total height of these CDs would be nearly 4cm when stacked together.

However, if you find a CD with a case, things get much easier. The thickness of a case is about 0.39 inches. So if you take 4 such cases together, their combined thickness will be 4 cm, while 3 of these gets you just over 1 inch.

While CDs have become less familiar with the rise of digital streaming services, many people still have CD collections or use CDs for specific purposes.

4. Length of A Safety Pin

Image by PDPics from Pixabay

Who doesn't know about safety pins? Those handy little pins you might find in your sewing kit or at home. They're one of those accessories we get in almost every house. Safety pins are always useful for fixing clothes and even crafting projects. 

The size of standard safety pins is 1.5 inches or, in centimeters, 3.8 cm long. That means 4 cm is almost the length of a safety pin. There are four more standard sizes for safety pins, from smaller to larger. But this one is the most usually used.

Alternatively, you can take sewing pins as a reference. Those are also 1.5 inches long on average. These pins are essential tools for sewing, crafting, and even temporary clothing or fabric fixes.

This article is exclusively written for Measruement Of.

5. Diameter of 4 AAA Batteries

Image by Thomas from Pixabay

The next example we can consider is AAA batteries. They are those small, cylindrical power sources you often pop into things like TV remotes, flashlights, digital camera, and toys to make them work.

Each AAA battery has a diameter of 10.5 mm, which is equivalent to 1 centimeter. It's around one-fourth of a 4-cm measurement.

When we put four of these batteries and combine their diameter length, it would be almost 4 centimeters (precisely 4.1 cm).

These batteries are super handy. Here is more about batteries!

6. Apple AirPods

Image by Yuxin Huang from Pixabay

The length of Apple AirPods, one of the popular earbuds, can also help you estimate 4 cm measurements.

These wireless earphones are something that lots of people love to use with their phones and other gadgets. The standard height of second-generation AirPods is 1.59 inches long, which is just about 4.03 centimeters.

So, while they're not exactly 4 centimeters long, they're pretty close to giving a better idea of this length.

These tiny earbuds are super popular because they're convenient and easy to use. Whether you're listening to music, taking calls, or asking Siri for help, AirPods are there to make your life a little easier. Plus, they come with a handy charging case that keeps them powered up on the go. 

7. Two Lego Bricks

Image by Semevent from Pixabay

LEGO bricks are colorful building blocks that kids (and adults!) love to play with. You'll find them in different sizes.

For example, 2x4 is one of the common LEGO bricks. The dimensions of these blocks are 1.6 cm x 3.2 cm x 1.1 cm.

As you can see, the depth of a Lego block is one-fourth of 4 centimeters, just like an AAA battery.

If you stack four of these blocks and take a look at their combined depth, it'll give a 4.4 cm measurement.


If you look around, you can find more everyday objects that are about 4 centimeters long. From small gadgets to crafting materials, 4cm is quite a useful measurement for small things.