Inches to CM Converter
Quick answer: To convert inches to CM, multiply by 2.54. For example, 10 in is 25.4 cm. One inch equals 2.54 cm.
- Calculator
- Formula
- Examples
- Size compared
- About the units
- Where used
- Step by step
- Popular conversions
- Reading your result
- Mistakes
- FAQ
- Related tools
- Method
Use the Inches to CM Converter
Inches to CM formula and what each symbol means
cm = in × 2.54
| Symbol | Meaning |
|---|---|
| in | Inch |
| cm | Centimeter |
Inches to CM examples
1 in
1 in × 2.54 = 2.54 cm.
10 in
10 in × 2.54 = 25.4 cm.
100 in
100 in × 2.54 = 254 cm.
Inches compared with CM
One in is 2.54 times as large as one cm, so your number gets bigger when you convert inches to CM and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About inches and CM
Inch (in): The international inch, exactly 2.54 centimetres. Centimeter (cm): One hundredth of a metre.
Where inches to CM conversions are used
Sports, aviation and shipping each keep their own favourites: yards on a football pitch, feet for altitude, nautical miles at sea. Road distances and maps use kilometres or miles, while building plans use metres, millimetres or feet.
How to calculate Inches to CM step by step
- Enter the value in in (the starting unit).
- Multiply by 2.54, because 1 in = 2.54 cm.
- The product is the value in cm. To go back, divide by 2.54 or multiply by 0.3937008.
Popular length conversions
How to read your Inches to CM result
Quick estimate: multiply by about 2.5 to get CM from inches; this is within 1.6% of the exact factor. Between metric and imperial, the key fact is that 1 inch is exactly 2.54 cm, which makes 1 foot exactly 0.3048 m, 1 yard exactly 0.9144 m and 1 mile exactly 1,609.344 m.
| INCHES | CM |
|---|---|
| 1 | 2.54 |
| 2 | 5.08 |
| 5 | 12.7 |
| 10 | 25.4 |
| 20 | 50.8 |
| 50 | 127 |
| 100 | 254 |
| 1,000 | 2,540 |
CM to Inches: quick table
| CM | INCHES |
|---|---|
| 1 | 0.3937008 |
| 5 | 1.968504 |
| 10 | 3.937008 |
| 25 | 9.84252 |
| 50 | 19.68504 |
| 100 | 39.37008 |
| 250 | 98.4252 |
| 500 | 196.8504 |
Common mistakes when calculating Inches to CM
- Rounding the factor too early, for example using 2.5 instead of 2.54 for inches.
- Dividing when you should multiply: from in to cm multiply by 2.54; from cm to in divide by 2.54.
Inches to CM FAQ
How many cm are in 1 in?
1 in equals 2.54 cm.
How many in are in 1 cm?
1 cm equals 0.3937008 in.
Is 1 in = 2.54 cm an exact conversion?
Yes. The inch and the centimeter are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 2.54 is just that ratio shown to 7 significant figures.
What is a centimeter (cm)?
One hundredth of a metre.
How can I estimate inches to CM in my head?
Quick estimate: multiply by about 2.5 to get CM from inches; this is within 1.6% of the exact factor.
What is 75 in in CM?
75 in = 190.5 cm (since 75 × 2.54).
What is 300 in in CM?
300 in = 762 cm (since 300 × 2.54).
What is 12 in in CM?
12 in = 30.48 cm (since 12 × 2.54).
How many decimals should I keep when converting in to cm?
Match the precision of your original measurement. For example, 25.4 cm rounds to 25.4 cm at 3 significant figures; keep more digits only for engineering or scientific work.
More in Length converters
- Inches to Meters Converter
- Feet to Miles Converter
- Inches to Miles Converter
- Feet to Meters Converter
- Inches to MM Converter
- Feet to KM Converter
See all length converters tools · All Conversion calculators · Site map
Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the SI base units