Ever held something and thought, “how big is that really?” You’re not alone.
20 centimeters shows up more in daily life than most people realize. It’s the width of a tablet, the length of a chef’s knife blade, even the short side of A4 paper.
This guide breaks down exactly what 20cm looks like, how it compares to inches, and which everyday objects match that size. No ruler needed by the end of this.
How Big Is 20cm?
Picture a standard smartphone stood on its end, then add a couple more centimeters. That’s roughly 20cm.
In the metric system, 20cm equals 200 millimeters or 0.2 meters. Switch over to the imperial system, and you’re looking at close to 8 inches, or 0.66 feet if you prefer feet.
It’s not a huge length. But it’s big enough to matter when you’re measuring product dimensions, planning furniture, or sizing up items for a DIY project.
How Many Inches Is 20cm?
Here’s the exact unit conversion: 20cm equals 7.87 inches. Most people round that to about 8 inches because it’s easier to remember.
This conversion chart trick works for quick math too. Every centimeter is roughly 0.39 inches, so multiplying by that number gets you close enough for daily use.
If you’re shopping online and a listing only gives centimeters, this conversion helps you picture the actual size before you buy. Nearly 8 inches is your mental shortcut going forward.
What Does 20cm Look Like?
Words only get you so far with length comparison. Try this instead: place two credit cards end to end. That distance is almost exactly 20cm.
Another way to see it? Compare it to a standard smartphone. Most phones run between 14cm and 16cm tall, so 20cm is a bit longer than your phone screen from top to bottom.
This kind of visual reference matters because numbers alone don’t stick in memory. Once you connect 20cm to something you touch daily, the size estimation becomes automatic.
How to Estimate 20cm Without a Ruler
Not every situation gives you access to a measuring tape or school ruler. Good news: your own body works as a backup measurement guide.
These next three tricks use parts of your hand and a few household items. They won’t replace a real ruler, but they get you close enough for quick jobs.
1. Using Your Hand
Stretch your hand from wrist to fingertip. On most adults, that distance lands close to 18 to 20cm, depending on hand size.
This adult hand trick comes in handy when you’re eyeballing furniture spacing or checking if something fits a shelf. It’s rough, but it’s fast.
Try it against a real ruler once so you know your personal number. Once you calibrate it, this hand measurement becomes a reliable go-to.
2. Using Your Fingers
Four fingers held together, side by side, usually measure close to 7 to 8cm. Do that roughly two and a half times, and you’re at 20cm.
Your middle finger alone, from base to tip, often measures around 7 to 9cm on adults. Double that plus a bit more gets you close to the mark.
This finger width method sounds odd, but tailors and carpenters have used body-based body measurement tricks for centuries. It’s old school, and it still works.
3. Using Common Objects
A standard smartphone stood upright plus a small gap covers most of 20cm. So does a dinner fork laid flat, since most forks run close to that length.
You can also grab a piece of printer paper. The short side of an A4 sheet measures almost exactly 21cm, just a touch over 20cm.
These everyday measurement shortcuts mean you rarely need to hunt down an actual ruler. Look around your kitchen or desk, and you’ll likely spot something close to 20cm already.
10 Common Things That Are 20cm Big
Now for the fun part. Below are ten everyday objects that measure close to 20cm, pulled from your kitchen, office, and living room. Once you see these, you’ll start noticing this size everywhere.
1. Large Banana
A large banana typically measures between 18cm and 22cm from tip to tip, putting it right in the 20cm length range. Next time you’re at the grocery store, grab one and hold it up. That’s your visual anchor for this whole guide.
Bananas vary a bit by variety and ripeness, so don’t expect an exact match every time. Still, as far as object comparison goes, this fruit is one of the easiest visual examples you’ll ever have.
2. Dinner Fork
Your average dinner fork or kitchen fork runs close to 20cm from the tip of the tines to the end of the handle. Smaller forks, like dessert forks, sit shorter, closer to 15cm.
Next time you set the table, take a second look at the dining fork in your hand. It’s a practical reference you already own, no need to buy anything special.
3. Small Tablet Width
A small tablet device, especially compact models, often measures around 20cm across the shorter width. This makes tablets a solid product dimensions reference for anyone shopping for electronic devices online.
If you’re comparing screen size between a tablet width and a smartphone, remember that most phones are narrower, closer to 7 to 8cm wide. The gap helps you picture scale fast.
4. TV Remote Control
Most television remote units, especially the ones for larger TVs, measure close to 20cm in length. That’s why a remote control often feels a bit long in your hand compared to a phone.
This is one of those household items you interact with daily without ever thinking about its actual size. Now you know why it fits comfortably yet still feels substantial.
5. A4 Paper Short Side
Standard A4 paper, the kind used in most offices and classroom settings outside the US, measures 21cm by 29.7cm. The short side of an A4 sheet sits just slightly above 20cm.
This makes printer paper one of the most accessible measurement reference tools around. Got a printer? You’ve got a near perfect 20cm ruler sitting in the tray.
6. Chef’s Knife Blade
A typical chef’s knife blade, not counting the handle, measures close to 20cm in professional and home kitchens alike. This size hits a sweet spot for chopping vegetables, slicing fruits, and prepping meat without feeling clunky.
Among kitchen tools, the chef’s knife is often considered the workhorse. If you cook often, you already own a near-exact 20cm measurement without realizing it.
7. Hair Brush
Many hair brush styles, particularly the paddle and cushion types, run close to 20cm in total length. That includes both the handle and the bristle head combined.
This compact size makes brushes easy to store in drawers or bags while still giving enough surface area to work through hair efficiently. It’s a good example of balanced size in everyday design.
8. Rolling Pin Handle Section
The rolling pin handle section, from the edge of the roller to the tip of the grip, frequently measures around 20cm on standard models. This gives enough leverage for baking tool work without making the whole pin unwieldy.
Bakers rolling out dough for pies or cookies rely on this practical size daily. It’s another kitchen item that quietly matches our target measurement.
9. Small Plush Toy
A small plush toy, or stuffed animal, especially the kind sold as gifts or collectibles, often measures close to 20cm tall. This size is popular because it’s big enough to hug but small enough to display on a shelf.
If you’re into collections or picking out gifts, this is a common standard length for soft toy products across most retailers.
10. Decorative Candle
A medium pillar candle used as a centerpiece or home decoration piece often stands around 20cm tall. This height works well on tables or shelves without overwhelming the space around it.
Whether you’re decorating for seasonal decorations or everyday home accessories, a candle this size hits the right balance between visibility and subtlety in your living room.
Why Knowing 20cm Matters for Everyday Life
Understanding this single length comparison saves time across more situations than you’d expect. From home improvement projects to crafting, knowing what 20cm looks like helps you skip unnecessary trips back to the store.
Think about furniture planning. If you’re fitting a shelf into a tight gap, or checking if a box fits under a table, having a mental reference for 20cm means faster decisions without constant remeasuring.
Online shopping online also gets easier once you build this instinct. Product measurements listed in centimeters stop being abstract numbers and start becoming something you can actually picture in your space.
20cm vs Other Common Measurements
It helps to see 20cm next to nearby sizes so the scale sticks better in your head.
- 10cm is roughly the length of a standard credit card.
- 15cm is close to a smartphone height on many older models.
- 20cm matches a chef’s knife blade or small tablet width.
- 25cm is closer to a standard school ruler, just under a foot.
- 30cm equals a full school ruler, the classic classroom staple.
Seeing this conversion guide laid out side by side makes 20cm feel less like a random number and more like a familiar checkpoint between a phone and a ruler.
Quick Metric to Imperial Conversion Table
| Metric | Imperial |
|---|---|
| 5 cm | 1.97 inches |
| 10 cm | 3.94 inches |
| 15 cm | 5.91 inches |
| 20 cm | 7.87 inches |
| 25 cm | 9.84 inches |
| 30 cm | 11.81 inches |
Keep this measurement table handy the next time you’re comparing product dimensions across a size guide on a shopping site. It turns guesswork into a quick glance.
Frequently Asked Questions
How big is 20cm in inches?
20cm converts to 7.87 inches, which most people round up to about 8 inches for everyday use. It’s a small but noticeable length, close to the width of a small tablet.
What does 20cm look like?
Think of two credit cards placed end to end, or a chef’s knife blade without the handle. Both give you a solid visual reference for this exact 20cm size.
Is 20cm close to 8 inches?
Yes, 20cm is nearly 8 inches, just slightly under at 7.87 inches. For quick mental math, rounding to 8 inches works fine in most casual situations.
How can I measure 20cm without a ruler?
Use your hand measurement from wrist to fingertip, or stack four fingers two and a half times. You can also grab a dinner fork or the short side of A4 paper as a quick visual estimation tool.
Is 20cm longer than a smartphone?
Usually, yes. Most smartphone models measure between 14cm and 16cm in height, so 20cm runs a bit longer than the average phone screen from top to bottom.
Conclusion
20cm isn’t just a number on a measuring tape. It’s the size of your chef’s knife, your TV remote, and even that banana sitting on the counter.
Once you connect this measurement to real objects around your home, size estimation stops feeling like guesswork. You’ve got a built-in reference now, no ruler required.
Next time you’re measuring objects for a project, shopping for household items, or just curious about dimensions, remember these ten examples. They’re proof that understanding measurements doesn’t need to be complicated, just practical.
Got a favorite 20cm object we missed? Drop it in the comments and share this guide with anyone who could use a quick measurement guide for everyday life.
Ethan Whitmore is the editor and administrator of Stylovix, dedicated to making measurements, conversions, sizes, and dimensions simple, accurate, and easy to understand.
