Convert cm to inches
1 cm = 0.393701 in · 1 in = 2.54 cm · Exact by definition
1 cm = 0.393701 in
The same value in other units
- millimetre
- 10 mm
- metre
- 0.01 m
- kilometre
- 1e-5 km
- foot
- 0.0328084 ft
- yard
- 0.0109361 yd
- mile
- 6.21371e-6 mi
- nautical mile
- 5.39957e-6 nmi
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
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Paste one conversion per line, written the way you would say it: "5 km to mi". Handy for a column copied out of a spreadsheet.
Length
cm to inches: conversion table
| centimetre | inch |
|---|---|
| 1 cm | 0.393701 in |
| 2 cm | 0.787402 in |
| 3 cm | 1.1811 in |
| 5 cm | 1.9685 in |
| 10 cm | 3.93701 in |
| 20 cm | 7.87402 in |
| 25 cm | 9.84252 in |
| 50 cm | 19.685 in |
| 100 cm | 39.3701 in |
| 250 cm | 98.4252 in |
| 500 cm | 196.85 in |
| 1000 cm | 393.701 in |
| inch | centimetre |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 5 in | 12.7 cm |
| 10 in | 25.4 cm |
| 20 in | 50.8 cm |
| 25 in | 63.5 cm |
| 50 in | 127 cm |
| 100 in | 254 cm |
| 250 in | 635 cm |
| 500 in | 1270 cm |
| 1000 in | 2540 cm |
How the conversion works
in = cm × 0.39370079
Both units are defined exactly, so the precision of the cm to inches result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
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