Convert mm to cm
1 mm = 0.1 cm · 1 cm = 10 mm · Exact by definition
1 mm = 0.1 cm
The same value in other units
- metre
- 0.001 m
- kilometre
- 1e-6 km
- inch
- 0.0393701 in
- foot
- 0.00328084 ft
- yard
- 0.00109361 yd
- mile
- 6.21371e-7 mi
- nautical mile
- 5.39957e-7 nmi
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
Convert a whole list
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
mm to cm: conversion table
| millimetre | centimetre |
|---|---|
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 3 mm | 0.3 cm |
| 5 mm | 0.5 cm |
| 10 mm | 1 cm |
| 20 mm | 2 cm |
| 25 mm | 2.5 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
| 250 mm | 25 cm |
| 500 mm | 50 cm |
| 1000 mm | 100 cm |
| centimetre | millimetre |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 3 cm | 30 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 20 cm | 200 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1000 mm |
| 250 cm | 2500 mm |
| 500 cm | 5000 mm |
| 1000 cm | 10000 mm |
How the conversion works
cm = mm × 0.1
Both units are defined exactly, so the precision of the mm to cm 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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