Convert Centimeters to Millimeters

Enter the length in centimeters below to get the value converted to millimeters.

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1 cm = 10 mm

How to Convert Centimeters to Millimeters

conversion scale showing centimeters and equivalent millimeters length values

To convert a centimeter measurement to a millimeter measurement, multiply the length by the conversion ratio. One centimeter is equal to 10 millimeters, so use this simple formula to convert:

millimeters = centimeters × 10

The length in millimeters is equal to the centimeters multiplied by 10.

For example, here's how to convert 5 centimeters to millimeters using the formula above.
5 cm = (5 × 10) = 50 mm

Our inch fraction calculator can add centimeters and millimeters together and it also automatically converts the results to US customary, imperial and SI metric values.

Centimeters and millimeters are both units used to measure length. Keep reading to learn more about each unit of measure.

Centimeters

One centimeter is equal to one-hundredth (1/100) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.

The centimeter, or centimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "centi" is the prefix for 10-2. Centimeters can be abbreviated as cm, for example 1 centimeter can be written as 1 cm.

Metric rulers typically have 30 cm, which are represented by 30 large tick marks. To get a rough idea of the actual length of a centimeter, a standard pencil is just about 1cm thick.

Millimeters

One millimeter is equal to one-thousandth (1/1,000) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.

The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "milli" is the prefix for 10-3. Millimeters can be abbreviated as mm, for example 1 millimeter can be written as 1 mm.

Millimeters are often represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a US dime is 1.35mm.

We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs.

If you need a ruler you can also download and print our free printable rulers, which include both imperial and metric measurements.

Centimeter Measurements and Equivalent Millimeter Conversions

Common centimeter values converted to the equivalent millimeter value
Centimeters Millimeters
1 cm 10 mm
2 cm 20 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
21 cm 210 mm
22 cm 220 mm
23 cm 230 mm
24 cm 240 mm
25 cm 250 mm
26 cm 260 mm
27 cm 270 mm
28 cm 280 mm
29 cm 290 mm
30 cm 300 mm
31 cm 310 mm
32 cm 320 mm
33 cm 330 mm
34 cm 340 mm
35 cm 350 mm
36 cm 360 mm
37 cm 370 mm
38 cm 380 mm
39 cm 390 mm
40 cm 400 mm

More Centimeter Length Conversions

US Customary & Imperial Units
Convert to Miles
1 cm is equal to 6.2137E-6 miles
Convert to Yards
1 cm is equal to 0.010936 yards
Convert to Feet
1 cm is equal to 0.032808 feet
Convert to Inches
1 cm is equal to 0.393701 inches
SI Units
Convert to Kilometers
1 cm is equal to 1.0E-5 kilometers
Convert to Meters
1 cm is equal to 0.01 meters
Convert to Micrometers
1 cm is equal to 10,000 micrometers
Convert to Nanometers
1 cm is equal to 10,000,000 nanometers