Centimeters to Millimeters Converter
Centimeters to millimeters is just a multiplication by 10 — a base-10 conversion within the metric system. It is the everyday move from a coarse measurement (centimeters on a ruler) to the finer millimeter scale used in engineering, machining, and most product spec sheets.
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How to Convert Centimeters to Millimeters
To convert centimeters to millimeters, multiply the number of centimeters by 10.
Worked Examples
- 1 centimeter = 1 × 10 = 10 mm
- 5 centimeters = 5 × 10 = 50 mm
- 12 centimeters = 12 × 10 = 120 mm
- 36 centimeters = 36 × 10 = 360 mm
Why Convert Centimeters to Millimeters?
- Translating a measurement taken with a centimeter ruler into the millimeters demanded by an engineering tolerance
- Converting retail-spec dimensions (in cm) into the millimeters used by CAD software
- Sizing the thickness of glass, sheet metal, or fabric from a cm description into millimeter-level precision
Centimeters to Millimeters Conversion Table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.01 cm | 0.1 mm |
| 0.1 cm | 1 mm |
| 0.25 cm | 2.5 mm |
| 0.5 cm | 5 mm |
| 0.75 cm | 7.5 mm |
| 1 cm | 10 mm |
| 1.5 cm | 15 mm |
| 2 cm | 20 mm |
| 2.5 cm | 25 mm |
| 3 cm | 30 mm |
| 4 cm | 40 mm |
| 5 cm | 50 mm |
| 6 cm | 60 mm |
| 7 cm | 70 mm |
| 8 cm | 80 mm |
| 9 cm | 90 mm |
| 10 cm | 100 mm |
| 11 cm | 110 mm |
| 12 cm | 120 mm |
| 13 cm | 130 mm |
| 14 cm | 140 mm |
| 15 cm | 150 mm |
| 16 cm | 160 mm |
| 17 cm | 170 mm |
| 18 cm | 180 mm |
| 19 cm | 190 mm |
| 20 cm | 200 mm |
| 24 cm | 240 mm |
| 30 cm | 300 mm |
| 36 cm | 360 mm |
| 48 cm | 480 mm |
| 60 cm | 600 mm |
| 72 cm | 720 mm |
| 84 cm | 840 mm |
| 96 cm | 960 mm |
| 100 cm | 1000 mm |
| 120 cm | 1200 mm |
| 144 cm | 1440 mm |
| 200 cm | 2000 mm |
| 300 cm | 3000 mm |
| 500 cm | 5000 mm |
| 1000 cm | 10000 mm |
What Is a Centimeter?
A centimeter is a metric unit of length equal to one hundredth (1/100) of a meter, widely used for everyday measurements worldwide.
The centimeter was introduced with the metric system after the French Revolution as part of a decimal-based effort to unify trade and science. Although not an SI base unit (the meter is), the centimeter became the practical workhorse for human-scale measurements once the metric system spread across Europe, Asia, and Latin America during the 19th and 20th centuries.
In everyday use: Centimeters are the default unit for measuring body dimensions (height, waist, chest), clothing sizes in most of the world, school stationery, and the height of children at pediatric checkups. Rulers in the metric world are usually graduated in centimeters with millimeter subdivisions.
The centimeter symbol is cm.
What Is a Millimeter?
A millimeter is a metric unit of length equal to one thousandth (1/1000) of a meter. It is the smallest commonly used metric unit for length.
The millimeter shares its origin with the meter, dating to the 1790s French definition of the metric system. As precision manufacturing matured in the 19th and 20th centuries, the millimeter became the preferred unit for engineering drawings outside the United States — fine enough for tight tolerances, but still readable without specialised tooling.
In everyday use: Millimeters dominate mechanical engineering, machining, and CAD drawings, as well as ammunition calibers (9 mm) and the thickness of materials like glass, sheet metal, or smartphone bezels. Camera lens focal lengths, watch case diameters, and most consumer-electronics dimensions are also published in millimeters.
The millimeter symbol is mm.
Precision and Accuracy
Exactly 10 mm per cm. Multiplying by ten is an exact shift; no measurement information is lost or rounded.
For most everyday purposes — recipes, room sizing, shopping — four decimal places of precision are more than enough. Engineering and scientific work may require additional digits or scientific notation for very small or very large results.
Common Centimeters to Millimeters Conversions
References
- National Institute of Standards and Technology (NIST) — SI Units: Length
- International Bureau of Weights and Measures (BIPM) — The International System of Units (SI)