20 cm is about 7.87 inches, or about 7 7/8 inch (slightly less). It is exactly 200 mm. Divide centimeters by 2.54, because 1 inch is defined as exactly 2.54 cm.
20 cm ≈ 7 7/8″
Slightly less than 7 7/8″ (by 0.03 mm) · ≈ 7.874 in
- Inches
- ≈ 7.874 in
- Nearest 1/16″
- 7 7/8″ 20 cm is 0.03 mm shorter
- Nearest 1/32″
- 7 7/8″ 20 cm is 0.03 mm shorter
- Nearest 1/64″
- 7 7/8″ 20 cm is 0.03 mm shorter
How long is 20 cm?
20 cm = 20 ÷ 2.54 in ≈ 7.8740 in. On a tape measure that is 7 7/8 in (7.875 in, 200.025 mm), and 20 cm is shorter than that by about 0.03 mm. In other units, 20 cm is exactly 200 mm and exactly 0.2 m, and ≈ 0.656 ft.
Numbers are hard to picture, so here is 20 cm drawn to scale next to real reference lengths.
Things that are about 20 cm long
Each size below comes from an official rule or a published specification. The note after each one says how close it is to 20 cm. Real objects vary.
A 20 cm ruler
A 20 cm ruler is exactly this length, 20 cm (about 7.87 in).
An A4 sheet (short side)
A4 is 210 mm × 297 mm, so its short side is 21 cm, 1 cm longer than 20 cm.
An 8-inch measurement
8 in is exactly 20.32 cm, so it is 3.2 mm longer than 20 cm. An 8-inch cake pan or chef’s knife is sold under this nominal size.
A 7-inch vinyl record
A 7-inch record is 17.78 cm across, so 20 cm is 2.22 cm longer.
A US dollar bill
A US bill is about 15.6 cm long, so 20 cm is about 4.4 cm longer.
20 cm to inches chart
Decimals are rounded to 3 places. In the fraction columns, + means the value is slightly longer than the fraction, − slightly shorter, and = exact.
| Centimeters (cm) | Inches (decimal) | Nearest 1/16″ | Nearest 1/32″ |
|---|---|---|---|
| 15 cm | 5.906 | 5 7/8″ + | 5 29/32″ − |
| 16 cm | 6.299 | 6 5/16″ − | 6 5/16″ − |
| 17 cm | 6.693 | 6 11/16″ + | 6 11/16″ + |
| 18 cm | 7.087 | 7 1/16″ + | 7 3/32″ − |
| 19 cm | 7.48 | 7 1/2″ − | 7 15/32″ + |
| 20 cm | 7.874 | 7 7/8″ − | 7 7/8″ − |
| 21 cm | 8.268 | 8 1/4″ + | 8 9/32″ − |
| 22 cm | 8.661 | 8 11/16″ − | 8 21/32″ + |
| 23 cm | 9.055 | 9 1/16″ − | 9 1/16″ − |
| 24 cm | 9.449 | 9 7/16″ + | 9 7/16″ + |
| 25 cm | 9.843 | 9 13/16″ + | 9 27/32″ − |
Frequently asked questions
How many inches is 20 cm?
20 cm is about 7.87 inches (7.8740 in), or about 7 7/8 inch.
How many mm is 20 cm?
20 cm is exactly 200 mm, because 1 cm is 10 mm.
Is 20 cm the same as 8 inches?
Almost. 8 inches is 20.32 cm, so 20 cm is 3.2 mm shorter than 8 inches.
How many feet is 20 cm?
20 cm is about 0.66 feet (0.6562 ft).
How do I measure 20 cm without a ruler?
An A4 sheet is 21 cm on its short side, which is 1 cm over. Use a ruler when it matters.
How do I convert cm to inches?
Divide the centimeters by 2.54. For 20 cm, 20 ÷ 2.54 ≈ 7.87 inches.