Many people search online and ask, how big is 20 cm? The simple and direct answer is this: 20 centimeters is equal to 7.87 inches, which is almost 8 inches long. It is a medium-sized length that is clearly visible, easy to hold in your hands, and commonly used in daily objects. It is shorter than a standard 30 cm ruler but longer than most smartphones.
When you hear “20 cm,” it may sound like just a number. But when you compare it with real-life objects like books, kitchen knives, water bottles, and paper sheets, the size becomes very clear. Understanding measurements through real objects makes it easier for your brain to remember them.
In this complete guide, you will fully understand how big is 20 cm using simple English, clear explanations, real-life examples, comparison tables, and unit conversions. After reading this article, you will never feel confused about 20 cm again.
What Exactly Is 20 cm?
20 cm means twenty centimeters. In the metric system, centimeters are used to measure small to medium lengths.
Here is the simple breakdown:
- 1 meter = 100 cm
- 20 cm = 0.2 meters
- 20 cm = 200 millimeters
- 20 cm = 7.87 inches
- 20 cm = 0.66 feet
So when someone asks, how big is 20 cm, you can say:
It is almost 8 inches long and about two-thirds of a standard ruler.
Is 20 cm Big or Small?
The answer depends on what you are measuring.
- For a phone → 20 cm is big.
- For a table → 20 cm is small.
- For a kitchen knife → 20 cm is medium.
- For a toy → 20 cm is medium to large.
In daily life, 20 cm is considered a medium-sized length. It is long enough to be clearly visible and useful, but small enough to carry easily.
How to Visualize 20 cm Without a Ruler
Sometimes you do not have a measuring tape. Still, you can estimate how big is 20 cm by using familiar objects.
Here are easy mental tricks:
- Look at a 30 cm school ruler.
20 cm is about two-thirds of it. - Think of an A4 paper width (21 cm).
20 cm is almost the same. - Imagine something just under 8 inches long.
When you connect 20 cm to common objects, the size becomes natural in your mind.
See Also: How Long Is 29 Inches? Real-Life Size Guide Explained
Things That Are About 20 cm Long (Detailed Real-Life Examples)
Now we will look at 16 real-life objects that help you fully understand how big is 20 cm. Each example is explained clearly and properly.
1. Standard Pencil Case
Most school pencil cases are around 20 cm long. They are designed to fit pencils, pens, erasers, and rulers easily.
When you place a pencil case flat on a desk, its length is easy to see. It is not tiny, and not very long. It fits inside backpacks without taking too much space. Because students use pencil cases every day, this is one of the easiest examples to understand how big is 20 cm.
2. A4 Paper Width
A standard A4 paper measures 21 cm wide. That means 20 cm is just 1 cm shorter.
If you hold A4 paper in your hand and look at its shorter side, you are almost looking at 20 cm. This makes paper one of the most accurate and helpful comparisons.
3. Kitchen Knife Blade (Medium Size)
Many kitchen knives have blades measuring about 18–20 cm. These knives are used for cutting vegetables, fruits, and meat.
When you hold a knife carefully and observe its blade length, you can clearly see what 20 cm looks like. It feels long enough for serious cutting tasks but still easy to control.
4. Paperback Book Height
Many paperback novels measure about 19–20 cm tall. When you hold a book in your hand, you feel its size clearly.
Books are everyday objects, so they make a perfect reference when thinking about how big is 20 cm.
5. Small Tablet Width
Some smaller tablets measure close to 20 cm wide. When you hold a tablet in landscape mode, the width is very close to this measurement.
This gives a modern and practical example.
6. Large Serving Spoon
Many cooking spoons are around 20 cm long. These are used in kitchens daily.
Place a large spoon on a table and look at it straight. That is almost exactly how big 20 cm is.
7. Compact Water Bottle Height
Some reusable water bottles stand about 20 cm tall. These are often used for gym, office, or school.
When placed upright, their height shows the measurement clearly.
8. Small Desk Organizer
Many desk organizers or storage boxes measure about 20 cm in width.
These are common in homes and offices, helping you easily understand the size.
9. TV Remote (Long Type)
Some longer TV remotes are close to 20 cm long. When you hold one in your hand, it feels comfortable and noticeable.
This makes remotes a helpful size example.
10. Two Smartphones Together
If you place two standard smartphones side by side, their total length is close to 20 cm.
This is a simple home experiment to understand the size.
11. Medium Hairbrush
Many hairbrushes measure around 20 cm long. They are easy to hold and use daily.
Because they are straight objects, they show the length clearly.
12. Small Wall Clock Diameter
Some compact wall clocks have a diameter of about 20 cm.
When mounted on a wall, the size looks medium and noticeable.
13. Small Laptop Sleeve Width
Laptop sleeves for smaller laptops often measure about 20 cm in height.
These sleeves protect devices while keeping them portable.
14. Forearm Length (For Some Adults)
For many adults, the distance from wrist to near elbow is about 20 cm.
This is not exact but useful for rough estimation.
15. Large Kitchen Spatula
Many kitchen spatulas measure around 20 cm long.
They are long enough for cooking but not too big.
Quick Comparison Table
| Object | Approximate Size |
| Pencil Case | 20 cm |
| A4 Paper Width | 21 cm |
| Kitchen Knife | 18–20 cm |
| Paperback Book | 20 cm |
| Water Bottle | 20 cm |
Converting 20 cm to Other Units
Understanding conversions helps when buying products internationally.
- 20 cm = 200 millimeters
- 20 cm = 7.87 inches
- 20 cm = 0.2 meters
- 20 cm = 0.66 feet
Conversion Table
| Unit | Value |
| Centimeters | 20 cm |
| Millimeters | 200 mm |
| Inches | 7.87 in |
| Feet | 0.66 ft |
| Meters | 0.2 m |
Why 20 cm Is a Popular Measurement
20 cm is popular because it balances:
- Portability
- Practical use
- Easy handling
- Compact storage
Many tools, books, electronics, and kitchen items are designed around this size.
FAQs
How big is 20 cm in inches?
It equals about 7.87 inches.
Is 20 cm almost 8 inches?
Yes, it is slightly less than 8 inches.
What objects are 20 cm long?
Pencil cases, books, knives, remotes, water bottles, and desk organizers.
Is 20 cm longer than a ruler?
No, a standard ruler is 30 cm long.
Can I measure 20 cm without tools?
Yes, use A4 paper width or a paperback book as reference.
Is 20 cm big for a toy?
It is medium to large for a toy.
Is 20 cm good for kitchen knives?
Yes, it is common for medium knives.
Why do many products use 20 cm?
Because it is practical, easy to hold, and useful in daily life.
See Also: How Long Is 30 Inches? Real-Life Size Guide Explained
Conclusion
Now you clearly understand how big is 20 cm. It is a medium-sized length, almost 8 inches long, and very common in daily life. By comparing it with real objects like pencil cases, books, knives, and water bottles, the measurement becomes easy and clear.
Next time you see 20 cm written on a product description, you will immediately understand the real size. This knowledge helps you shop smarter, plan better, and avoid confusion.
