How Big is 20 cm? Visual Guide With Real Examples
Quick answer: 20 cm is 7.874 inches, 200 mm, and 0.656 feet. In other words, it is just under 7.874 inches long, which makes it easy to picture on an ordinary ruler, where each centimetre is one of the numbered marks.
Exact Conversion
To convert centimetres to inches, divide by 2.54, because one inch is exactly 2.54 cm. So 20 ÷ 2.54 = 7.874 inches. To get millimetres, multiply by 10, because there are 10 mm in 1 cm, giving 200 mm. To get feet, divide by 30.48, because one foot is 30.48 cm, giving 0.656 feet. Try the cm to inches converter or the cm to feet converter for other values.
| Unit | Value |
|---|---|
| Centimetres | 20 cm |
| Inches | 7.874 in |
| Millimetres | 200 mm |
| Feet | 0.656 ft |
| Metres | 0.2 m |
Real-Life Examples
a dinner fork or a sheet of paper is a size you meet in everyday life more often than you might expect. Here are some familiar comparisons that help you picture it without a ruler in your hand.
- The length of a standard A4 sheet of paper on its short side, which is 21 cm, so 20 cm is just a little less.
- The length of a dinner fork, which is often about 20 cm long.
- The width of a laptop screen in smaller models, measured diagonally in a different way, but the screen itself is often about 20 cm wide.
- The length of a small kitchen knife blade in many sets.
- The height of a tall drinking glass.
How to Measure It
Place a ruler or tape measure with its zero mark exactly at one end of the object, not a little way in from the end, and read the number at the other end. On a metric ruler, count the long numbered marks: each one is a centimetre, and the small marks between them are millimetres. If you only have an inch ruler, measure in inches and multiply by 2.54. For a dinner fork or a sheet of paper, keep the ruler flat against the surface and look straight down at it, because looking from an angle can shift the reading by a millimetre or two.
Common Uses: Where You See This Size
Twenty centimetres, just under 8 inches, is a useful size in the kitchen, the office, and the classroom. It covers the length of cutlery, small tools, and paper, and it is a common measurement for the width of books, folders, and small storage boxes.
Common Mistakes to Avoid
The most common mistake is confusing centimetres with millimetres, which makes a measurement ten times too large or too small. Another is starting from the 1 mark instead of zero, which adds a whole centimetre to the result. People also round too early: 20 cm is 7.874 inches, not a neat whole number, so if you need accuracy for cutting, sewing, or fitting, keep at least two decimal places until the final step.
Frequently Asked Questions
How many inches is 20 cm?
20 cm is 7.874 inches, because 20 ÷ 2.54 = 7.874.
How many millimetres is 20 cm?
20 cm is 200 mm, because there are 10 mm in every centimetre.
How many feet is 20 cm?
20 cm is 0.656 feet, because one foot is 30.48 cm.
Is 20 cm bigger than an inch?
Yes, except for very small values. One centimetre is smaller than an inch, but once you reach 3 cm you are already past an inch, and at larger values the gap grows quickly.
How do I convert 20 cm without a calculator?
For a rough answer, divide by 2.5 instead of 2.54. That gives about 8.0 inches, close enough for a quick picture, but use the exact 7.874 inches when accuracy matters.