Quick answer: 20 centimeters equals 7.87 inches, 0.2 meters, or 200 millimeters. It’s close to the length of a standard pencil or the span of an adult hand small enough to hold, but noticeable enough to picture right away.
If you’ve come across “20cm” and wondered exactly how big that is, comparing it to things you already own is the quickest way to understand it. Below you’ll find the exact conversion, a couple of tool-free ways to estimate it, and 10 everyday objects that are close to 20cm in size.
20cm in Other Units
| Unit | Value |
|---|---|
| Inches | 7.87 in |
| Millimeters | 200 mm |
| Meters | 0.2 m |
| Feet | 0.66 ft |
| Yards | 0.22 yd |
How to Estimate 20cm Without a Ruler
You don’t always need a measuring tool to judge a size this small. Try these quick methods:
- Spread your hand. Most adults have a hand span (thumb tip to little-finger tip) of about 18–20cm, making your own hand one of the fastest references you’ll always have with you.
- Use a pencil. A standard unsharpened pencil is close to 19cm long, just a hair under 20cm.
- Check a ruler. If you have a 30cm school ruler nearby, 20cm is simply the two-thirds mark an easy visual anchor.
10 Everyday Things That Are About 20cm
1. An Adult Hand Span
Stretch your hand out fully, from the tip of your thumb to the tip of your little finger. For most adults, that distance lands right around 18–20cm, making it one of the most convenient built-in references for this size.
2. A Standard Pencil
A brand-new, unsharpened pencil measures close to 19cm just shy of 20cm. It’s a comparison almost everyone has sitting in a drawer or pencil case, which makes it an easy mental reference.
3. A Side or Dessert Plate
Smaller plates used for sides, bread, or desserts are typically around 20cm across, noticeably smaller than a standard 25–28cm dinner plate. Next time you set the table, this is a size you can compare directly.
4. A Paperback Book
Most standard paperback novels are close to 19–20cm tall. If you have one on your shelf, its height gives a solid, everyday reference point for this length.
5. A Standard Brick
A common building brick is often around 19–20cm long, depending on the region and style. It’s a useful comparison if you’re picturing 20cm in a construction or DIY context.
6. A 500ml Water Bottle
A typical 500ml bottled water container stands close to 20cm tall. Since most people handle one of these daily, it’s an easy way to visualize the size without any extra effort.
7. A DVD Case
A standard DVD case measures about 19cm in height. If you still have a few in a media cabinet, that’s a quick, reliable comparison for 20cm.
8. A Letter-Size Envelope
Many standard mailing envelopes run close to 22cm in length, just a bit longer than 20cm. It’s a handy comparison for anyone picturing this size in an office or mailing context.
9. A 7-inch Vinyl Record
A 7-inch vinyl single measures about 17.5cm across close to 20cm and a fun, tactile comparison if you’re into music or collectibles.
10. Two-Thirds of a School Ruler
If you have a standard 30cm school ruler handy, 20cm falls exactly two-thirds of the way down it. It’s one of the most precise, no-guesswork comparisons on this list.
20cm vs. Other Common Sizes
Seeing 20cm next to sizes you already know makes it easier to place:
- 20cm is about twice as long as a credit card (8.5 cm)
- 20cm is roughly two-thirds of a standard 30cm ruler
- 20cm is just under half the length of a standard sheet of A4 paper turned lengthwise (29.7 cm)
- 20cm is close to the width of a standard laptop keyboard section
Frequently Asked Questions
20cm is approximately 7.87 inches, just under 8 inches.
20cm equals exactly 200 millimeters.
A standard pencil and an adult hand span are two of the closest, most convenient comparisons.
Spread your hand from thumb tip to little-finger tip, or use a pencil as a rough guide.
It’s a small-to-medium size bigger than a smartphone screen but smaller than a standard sheet of paper.
Conclusion
20cm equals 7.87 inches or 200 millimeters, and once you connect it to something familiar a pencil, a hand span, a small plate the size becomes easy to picture without reaching for a ruler. Whether you’re shopping online, following a recipe, or just curious about a measurement you spotted, these real-world comparisons make 20cm simple to visualize.
Want to convert 20cm to another unit instantly? Use our free converters to switch between centimeters, inches, millimeters, and more in one click.
