20 cm is a common measurement that appears in product sizes, schoolwork, kitchen tools, crafts, and many everyday items. If you do not normally use centimeters, it can be hard to picture what 20 cm actually looks like.
In simple terms, 20 cm equals 200 millimeters, 0.2 meters, or about 7.87 inches. That means it is just a little shorter than 8 inches.
One easy way to picture 20 cm is to look at the short side of an A4 sheet of paper. That side measures 21 cm, so 20 cm is only 1 cm shorter. A large dinner fork, TV remote, or chef’s knife blade may also be close to this length, although their sizes can vary.
How Big Is 20cm?
A length of 20 cm is neither very small nor very large. It is long enough to be easy to see and hold, but still short enough to fit comfortably on a desk, shelf, or inside a bag.
If you have a standard 30 cm school ruler, 20 cm reaches from the zero mark to the 20 cm mark. This is exactly two-thirds of the ruler’s measured length.
Another useful comparison is A4 paper. The short side of an A4 sheet is exactly 21 cm. This means 20 cm is only 1 cm shorter than the width of the paper.
In inches, 20 cm is about 7.87 inches. For a quick mental picture, you can simply think of a length that is just under 8 inches.
20cm in Other Units
Here are the main conversions for 20 cm.
| Unit | 20cm Equals |
|---|---|
| Millimeters | 200 mm |
| Meters | 0.2 m |
| Inches | 7.874 inches |
| Feet | About 0.656 ft |
| Yards | About 0.219 yd |
The metric conversions are simple. Since 1 centimeter equals 10 millimeters, 20 cm equals exactly 200 mm. Since 100 centimeters make 1 meter, 20 cm equals exactly 0.2 meters.
To convert centimeters to inches, divide the number of centimeters by 2.54. So:
20 ÷ 2.54 = 7.874 inches
For everyday use, this is normally rounded to 7.87 inches.
It is also useful to remember that 8 inches equals 20.32 cm. So 20 cm is very close to 8 inches, but it is not exactly the same.
10 Everyday Things That Can Help You Picture 20cm
Everyday objects can make a measurement much easier to understand. The examples below are useful references, but not all of them are exactly 20 cm. Some objects naturally vary in size, so they should be used only as rough comparisons.
1. The Short Side of A4 Paper
An A4 sheet of paper measures 21 cm wide and 29.7 cm long. This makes the short side one of the easiest ways to picture 20 cm.
Since the short edge is 21 cm, a 20 cm length would stop just 1 cm before the edge. That small difference makes A4 paper a very useful reference when you do not have a ruler nearby.
This comparison is more reliable than many household objects because A4 paper has a standard size.
2. Two-Thirds of a 30cm Ruler
A standard metric school ruler is usually 30 cm long. If you look at the ruler and stop at the 20 cm mark, you have exactly 20 cm.
This means 20 cm is two-thirds of a 30 cm ruler. It is a simple comparison because there is no guessing involved.
If you are trying to understand how long 20 cm is, a ruler gives you the clearest visual reference.
3. An 8-Inch Chef’s Knife Blade
Many common chef’s knives are sold with an 8-inch blade. Eight inches equals 20.32 cm, so the blade is only 0.32 cm longer than 20 cm.
That difference is just 3.2 millimeters, which is very small. Because of this, an 8-inch chef’s knife blade gives a close picture of a 20 cm length.
Remember that this refers only to the blade, not the whole knife. Knife sizes also vary, so always check the listed blade length.
4. A Large Dinner Fork
Some large dinner forks are close to 20 cm from the end of the handle to the tips of the tines.
Fork sizes are not fixed. They vary by brand, design, and type, so a dinner fork should not be treated as an exact measuring tool.
Still, because most people see and use forks regularly, a larger dinner fork can give you a useful rough idea of what 20 cm looks like.
5. A TV Remote Control
Many full-size TV remotes are somewhere around 20 cm long. Some are shorter, while others are slightly longer depending on the brand and model.
A remote is useful as a visual comparison because it is a familiar object found in many homes. If your remote is close to 20 cm, holding it can help you understand the size very quickly.
This is only an approximate comparison, though. Remote controls do not have one standard length.
6. A Large Banana
A large banana can be around 18 to 22 cm long. Because bananas vary naturally, this is only a rough comparison.
Still, a banana is familiar to most people, so it can help you picture a 20 cm length quite easily. A larger banana is often close enough to give a useful everyday reference.
7. An Adult Hand
For some adults, the distance from the wrist to the tip of the middle finger can be close to 20 cm.
Hand size varies a lot from person to person, so this should only be used for a quick estimate. If your own hand happens to be close to 20 cm, it can become a handy personal reference when no ruler is available.
8. A Full-Size Hairbrush
Some full-size hairbrushes are around 20 cm long from end to end.
The exact size depends on the type of brush. Travel brushes may be much shorter, while large paddle brushes can be longer. Still, an ordinary full-size brush can give you a rough idea of what 20 cm looks like.
9. A 20cm Plush Toy
Plush toys are often sold by height, and 20 cm is a common listed size.
A toy that is actually labeled as 20 cm tall gives you a direct visual reference for the measurement. Just remember that product dimensions can sometimes refer to height, length, or another direction, so it is worth checking the listing carefully.
10. A 20cm Decorative Candle
Pillar and decorative candles are sold in many different heights, including around 20 cm.
A candle listed as 20 cm tall can help you picture the measurement standing upright. This is more reliable than guessing the size of a random candle because the product dimensions give you the actual height.
Where You May See 20cm
You may come across 20 cm when reading product sizes online, especially for kitchen tools, storage items, toys, decorations, and small home products.
It also appears in schoolwork, crafts, sewing, drawing, and DIY projects. Knife blades and some household tools may also be listed in centimeters.
Knowing what 20 cm looks like can be especially useful when shopping online. A number in centimeters can feel hard to picture, but comparing it with A4 paper or an 8-inch length makes the size much easier to understand.
20cm Compared With Nearby Sizes
Small differences in centimeters can change how an object looks, but the change is often less dramatic than people expect.
| Length | Inches | Difference From 20cm |
|---|---|---|
| 15 cm | 5.91 in | 5 cm shorter |
| 18 cm | 7.09 in | 2 cm shorter |
| 19 cm | 7.48 in | 1 cm shorter |
| 20 cm | 7.87 in | — |
| 21 cm | 8.27 in | 1 cm longer |
| 25 cm | 9.84 in | 5 cm longer |
| 30 cm | 11.81 in | 10 cm longer |
A 19 cm object is only slightly shorter than 20 cm, while a 21 cm object is only slightly longer. The short side of A4 paper is a good example of 21 cm.
A 25 cm length is more clearly longer, while 30 cm is half again as long as 20 cm. Put another way, 20 cm is exactly two-thirds of 30 cm.
Quick Conversion Table
Here are the most useful conversions for 20 cm.
| Unit | Equivalent |
|---|---|
| Millimeters | 200 mm |
| Meters | 0.2 m |
| Inches | 7.874 in |
| Feet | About 0.656 ft |
| Yards | About 0.219 yd |
The metric values are exact. The inch, foot, and yard values are usually rounded for easier reading.
Final Thoughts
20 cm equals 200 mm, 0.2 meters, or about 7.87 inches.
The simplest way to picture it is to think of a length just 1 cm shorter than the short side of A4 paper, or just under 8 inches. Everyday objects can also help, as long as you remember that their sizes may vary.
Common Questions About 20cm
How many inches is 20cm?
20 cm is about 7.87 inches.
The exact value is approximately 7.874 inches, so saying “just under 8 inches” is a useful everyday estimate.
Is 20cm the same as 8 inches?
No. They are very close, but not exactly the same.
Eight inches equals 20.32 cm, so 8 inches is 0.32 cm, or 3.2 mm, longer than 20 cm.
What does 20cm look like?
20 cm is slightly shorter than the 21 cm short side of A4 paper.
It is also two-thirds of a 30 cm ruler and just under 8 inches long. These are some of the easiest ways to picture the size.
How many millimeters is 20cm?
20 cm equals exactly 200 millimeters.
There are 10 millimeters in 1 centimeter, so 20 × 10 = 200 mm.
How long is 20cm on a ruler?
On a metric ruler, 20 cm is the distance from the zero mark to the 20 cm mark.
On a 30 cm school ruler, this covers exactly two-thirds of the measured length.
How can I estimate 20cm without a ruler?
An A4 sheet of paper is one of the best simple references because its short side is 21 cm.
You can also use a large dinner fork, TV remote, banana, or your hand for a rough estimate, but those objects vary in size.
Is 20cm longer than a smartphone?
In many cases, yes. Many smartphones are shorter than 20 cm from top to bottom.
Phone sizes vary by model, though, so this is only a general comparison rather than a fixed rule.
