CM to Inches Converter
Quick answer: To convert CM to inches, multiply by 0.3937008. For example, 10 cm is 3.937008 in. One centimeter equals 0.3937008 in.
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Use the CM to Inches Converter
CM to Inches formula and what each symbol means
in = cm × 0.3937008
| Symbol | Meaning |
|---|---|
| cm | Centimeter |
| in | Inch |
CM to Inches examples
1 cm
1 cm × 0.3937008 = 0.3937008 in.
10 cm
10 cm × 0.3937008 = 3.937008 in.
100 cm
100 cm × 0.3937008 = 39.37008 in.
CM compared with Inches
One in is 2.54 times as large as one cm, so your number gets smaller when you convert CM to inches and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About CM and inches
Centimeter (cm): One hundredth of a metre. Inch (in): The international inch, exactly 2.54 centimetres.
Where CM to inches 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 CM to Inches step by step
- Enter the value in cm (the starting unit).
- Multiply by 0.3937008, because 1 cm = 0.3937008 in.
- The product is the value in in. To go back, divide by 0.3937008 or multiply by 2.54.
How to read your CM to Inches result
Quick estimate: multiply by about 0.4 to get inches from CM; 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.
| CM | INCHES |
|---|---|
| 1 | 0.3937008 |
| 2 | 0.7874016 |
| 5 | 1.968504 |
| 10 | 3.937008 |
| 20 | 7.874016 |
| 50 | 19.68504 |
| 100 | 39.37008 |
| 1,000 | 393.7008 |
Inches to CM: quick table
| INCHES | CM |
|---|---|
| 1 | 2.54 |
| 5 | 12.7 |
| 10 | 25.4 |
| 25 | 63.5 |
| 50 | 127 |
| 100 | 254 |
| 250 | 635 |
| 500 | 1,270 |
Common mistakes when calculating CM to Inches
- Rounding the factor too early, for example using 2.5 instead of 2.54 for inches.
- Dividing when you should multiply: from cm to in multiply by 0.3937008; from in to cm divide by 0.3937008.
CM to Inches FAQ
How many in are in 1 cm?
1 cm equals 0.3937008 in.
How many cm are in 1 in?
1 in equals 2.54 cm.
Is 1 cm = 0.3937008 in an exact conversion?
Yes. The centimeter and the inch are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 0.3937008 is just that ratio shown to 7 significant figures.
What is an inch (in)?
The international inch, exactly 2.54 centimetres.
How can I estimate CM to inches in my head?
Quick estimate: multiply by about 0.4 to get inches from CM; this is within 1.6% of the exact factor.
What is 150 cm in inches?
150 cm = 59.05512 in (since 150 × 0.3937008).
What is 0.5 cm in inches?
0.5 cm = 0.1968504 in (since 0.5 × 0.3937008).
What is 25 cm in inches?
25 cm = 9.84252 in (since 25 × 0.3937008).
How many decimals should I keep when converting cm to in?
Match the precision of your original measurement. For example, 3.937008 in rounds to 3.94 in at 3 significant figures; keep more digits only for engineering or scientific work.
More in Length converters
- CM to Miles Converter
- Yards to Miles Converter
- CM to MM Converter
- Yards to Meters Converter
- CM to Yards Converter
- Yards to KM Converter
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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