18 cm is about 7.09 inches, or about 7 3/32 inch (slightly less). It is exactly 180 mm. Divide centimeters by 2.54, because 1 inch is defined as exactly 2.54 cm.
18 cm ≈ 7 3/32″
Slightly less than 7 3/32″ (by 0.18 mm) · ≈ 7.087 in
- Inches
- ≈ 7.0866 in
- Nearest 1/16″
- 7 1/16″ 18 cm is 0.61 mm longer
- Nearest 1/32″
- 7 3/32″ 18 cm is 0.18 mm shorter
- Nearest 1/64″
- 7 3/32″ 18 cm is 0.18 mm shorter
How long is 18 cm?
18 cm = 18 ÷ 2.54 in ≈ 7.0866 in. On a tape measure that is 7 3/32 in (7.0938 in, 180.181 mm), and 18 cm is shorter than that by about 0.18 mm. In other units, 18 cm is exactly 180 mm and exactly 0.18 m, and ≈ 0.591 ft.
Numbers are hard to picture, so here is 18 cm drawn to scale next to real reference lengths.
Things that are about 18 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 18 cm. Real objects vary.
An 18 cm cake tin
Round cake tins are sold as 18 cm, a nominal diameter of exactly 18 cm (about 7.09 in).
A 7-inch vinyl record
A 7-inch record is 17.78 cm across, so it is 2.2 mm narrower than 18 cm.
A mass-market paperback
A standard US mass-market paperback is about 4.25 × 6.87 in, so it is about 17.45 cm tall, about 5.5 mm under 18 cm.
Two bank cards end to end
A bank card is 85.6 mm long, so two in a row are 17.12 cm, about 8.8 mm under 18 cm.
An A5 sheet (short side)
A5 is 148 mm × 210 mm, so its short side is 14.8 cm, 3.2 cm shorter than 18 cm.
18 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″ |
|---|---|---|---|
| 13 cm | 5.118 | 5 1/8″ − | 5 1/8″ − |
| 14 cm | 5.512 | 5 1/2″ + | 5 1/2″ + |
| 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″ − |
Frequently asked questions
How many inches is 18 cm?
18 cm is about 7.09 inches (7.0866 in), or about 7 3/32 inch.
How many mm is 18 cm?
18 cm is exactly 180 mm, because 1 cm is 10 mm.
Is 18 cm the same as 7 inches?
Almost. 7 inches is 17.78 cm, so 18 cm is 2.2 mm longer than 7 inches.
How many feet is 18 cm?
18 cm is about 0.59 feet (0.5906 ft).
How do I measure 18 cm without a ruler?
A 7-inch record is 17.78 cm across, only 2.2 mm short. Use a ruler when it matters.
How do I convert cm to inches?
Divide the centimeters by 2.54. For 18 cm, 18 ÷ 2.54 ≈ 7.09 inches.