Convert Centimeters to Inches
30 centimeters is 11.81 in. One centimeter is exactly 0.393700787402 inches.
30 centimeters is 11.811024 inches, because one centimeter is 0.39370079 inches. To convert centimeters to inches, multiply by 0.39370079; to go the other way, divide by 0.39370079 or multiply by 2.54. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST. One hundredth of a meter, and the unit most of the world states height in.
Factor checked against the defining standard · How we check
- Centimeters × 0.39370079
30 * 0.393700811.811 in
30 centimeters in every length unit
| Unit | Value | Exact factor |
|---|---|---|
| inches | 11.81102362 in | × 0.393700787402 |
| feet | 0.9842519685 ft | × 0.0328083989501 |
| yards | 0.3280839895 yd | × 0.0109361329834 |
| miles | 0.0001864113577 mi | × 0.00000621371192237 |
| millimeters | 300 mm | × 10 |
| decimetres | 3 dm | × 0.1 |
| centimeters (as entered) | 30 cm | — |
| meters | 0.3 m | × 0.01 |
| kilometers | 0.0003 km | × 0.00001 |
| nautical miles | 0.000161987041 nmi | × 0.00000539956803456 |
| micrometers | 300,000 µm | × 10,000 |
| nanometers | 300,000,000 nm | × 10,000,000 |
| thou | 11,811.02362 thou | × 393.700787402 |
Factors are entered by hand from NIST rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: centimetres to inches is the British spelling of the same units — the metre and the litre are spelled that way outside the United States and the quantity does not change.
How do you convert centimeters to inches? The converter and the working
- 1.Take the measurement in centimeters.
- 2.Multiply by 0.39370079 — that is how many inches fit in one centimeter.
- 3.To go back the other way, divide by 0.39370079, or multiply by 2.54.
Worked example: 25 centimeters to inches
- Formula
- cm × 0.39370079 = in
- Arithmetic
- 25 × 0.39370079 = 9.84 in
- Answer
- 25 cm = 9.84 in
The factor is rounded for display; the figure above is computed from the full value.
Centimeters to inches conversion table
| Centimeters | Inches |
|---|---|
| 1 cm | 0.39 in |
| 2 cm | 0.79 in |
| 3 cm | 1.18 in |
| 4 cm | 1.57 in |
| 5 cm | 1.97 in |
| 6 cm | 2.36 in |
| 7 cm | 2.76 in |
| 8 cm | 3.15 in |
| 9 cm | 3.54 in |
| 10 cm | 3.94 in |
| 12 cm | 4.72 in |
| 15 cm | 5.91 in |
| 20 cm | 7.87 in |
| 25 cm | 9.84 in |
| 50 cm | 19.69 in |
| 100 cm | 39.37 in |
| 200 cm | 78.74 in |
| 300 cm | 118.11 in |
| 500 cm | 196.85 in |
| 1000 cm | 393.7 in |
| 2000 cm | 787.4 in |
| 5000 cm | 1,968.5 in |
| 10000 cm | 3,937.01 in |
What is a centimeter?
One hundredth of a meter, and the unit most of the world states height in.
What is an inch?
Exactly 25.4 millimeters since the 1959 international yard and pound agreement, and one twelfth of a foot.
How many inches are in a centimeter?
One centimeter is 0.39370079 inches. Going the other way, one inch is 2.54 centimeters. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every length unit here
The whole group — 13 units with their symbols and the size of each one in meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a centimeter.
Source: NIST — international yard and pound agreement (inch = 25.4 mm exactly)
Cite this page
- APA
- Rule Calculator. (2026). Convert Centimeters to inches. Rule Calculator. https://rulecalculators.com/convert/centimeter-to-inch
- MLA
- "Convert Centimeters to inches." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/centimeter-to-inch.
- Chicago
- Rule Calculator. "Convert Centimeters to inches." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/centimeter-to-inch.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many inches are in a centimeter?
- 0.39370079. Exactly 25.4 millimeters since the 1959 international yard and pound agreement, and one twelfth of a foot.
- How do I convert inches back to centimeters?
- Divide by 0.39370079, or multiply by 2.54 — they are the same operation.
The values people look up
Each one is this page with the value filled in, and each answers in its own title.
Other length conversions
Inches to centimeters — the same conversion the other way.