Convert Centimeters to Millimeters

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

Results in Millimeters:

1 cm = 10 mm

Do you want to convert millimeters to centimeters?

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