30 cm is about 11.81 inches, or about 11 13/16 inch (slightly less). It is exactly 300 mm. Divide centimeters by 2.54, because 1 inch is defined as exactly 2.54 cm.
30 cm ≈ 11 13/16″
Slightly less than 11 13/16″ (by 0.04 mm) · ≈ 11.811 in
- Inches
- ≈ 11.811 in
- Nearest 1/16″
- 11 13/16″ 30 cm is 0.04 mm shorter
- Nearest 1/32″
- 11 13/16″ 30 cm is 0.04 mm shorter
- Nearest 1/64″
- 11 13/16″ 30 cm is 0.04 mm shorter
How long is 30 cm?
30 cm = 30 ÷ 2.54 in ≈ 11.8110 in. On a tape measure that is 11 13/16 in (11.812 in, 300.037 mm), and 30 cm is shorter than that by about 0.04 mm. In other units, 30 cm is exactly 300 mm and exactly 0.3 m, and ≈ 0.984 ft.
Numbers are hard to picture, so here is 30 cm drawn to scale next to real reference lengths.
Things that are about 30 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 30 cm. Real objects vary.
A 30 cm ruler
A 30 cm ruler is exactly this length, 30 cm (about 11.81 in). Many are also marked to 12 in, which is 30.48 cm.
One foot
12 in is exactly 30.48 cm, so a foot is 4.8 mm longer than 30 cm.
A 12-inch vinyl record
An LP is 12 in (30.48 cm) across, so it is 4.8 mm wider than 30 cm.
An A4 sheet (long side)
A4 is 210 mm × 297 mm, so its long side is 29.7 cm, 3 mm shorter than 30 cm.
A 30 × 40 cm frame
30 × 40 cm is a standard photo and poster frame size, so its short side is exactly 30 cm.
30 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″ |
|---|---|---|---|
| 25 cm | 9.843 | 9 13/16″ + | 9 27/32″ − |
| 26 cm | 10.236 | 10 1/4″ − | 10 1/4″ − |
| 27 cm | 10.63 | 10 5/8″ + | 10 5/8″ + |
| 28 cm | 11.024 | 11″ + | 11 1/32″ − |
| 29 cm | 11.417 | 11 7/16″ − | 11 13/32″ + |
| 30 cm | 11.811 | 11 13/16″ − | 11 13/16″ − |
| 31 cm | 12.205 | 12 3/16″ + | 12 7/32″ − |
| 32 cm | 12.598 | 12 5/8″ − | 12 19/32″ + |
| 33 cm | 12.992 | 13″ − | 13″ − |
| 34 cm | 13.386 | 13 3/8″ + | 13 3/8″ + |
| 35 cm | 13.78 | 13 3/4″ + | 13 25/32″ − |
Frequently asked questions
How many inches is 30 cm?
30 cm is about 11.81 inches (11.8110 in), or about 11 13/16 inch.
How many mm is 30 cm?
30 cm is exactly 300 mm, because 1 cm is 10 mm.
Is 30 cm the same as 1 foot?
Almost. A foot is 30.48 cm, so 30 cm is 4.8 mm shorter than a foot.
How many feet is 30 cm?
30 cm is about 0.98 feet (0.9843 ft).
How do I measure 30 cm without a ruler?
An A4 sheet is 29.7 cm on its long side, only 3 mm short. Use a ruler when it matters.
How do I convert cm to inches?
Divide the centimeters by 2.54. For 30 cm, 30 ÷ 2.54 ≈ 11.81 inches.