Millimeters to Centimeters (mm to cm) Converter

Enter millimeters to get centimeters. Dividing by 10 moves the decimal point one place to the left.

10 mm = 1 cm

From
To
0.1
Try:
Step-by-stepmm โ†’ cm
11 cm = 10 mmformula
21 รท 10substitute
30.1 cmresult
URLiunitconverter.com/length/millimeters-to-centimeters?value=1Open
1 mm in every unit
mm
Millimeter
1 mm = 0.1 cm
1 mm
cm
Centimeter
1 cm = 10 mm
0.1 cm
m
Meter
SI base unit
0.001 m
km
Kilometer
1 km = 1,000 m
0.000001 km
in
Inch
1 in = 2.54 cm exactly
0.039370079 in
ft
Foot
1 ft = 12 in
0.0032808399 ft
yd
Yard
1 yd = 3 ft
0.0010936133 yd
mi
Mile
1 mi = 5,280 ft
6.2137119e-7 mi

Millimeters to Centimeters Formula

centimeters = millimeters รท 10

One centimeter is 10 millimeters, by definition, so the conversion is exact. For example, 10 mm รท 10 = 1 cm.

Where Millimeters Are the Norm

Technical drawings, building plans and product specifications in metric countries use millimeters only, even for large sizes. A 2.4 m wall is drawn as 2400 mm, not 240 cm, so every dimension on the page uses the same unit.

ItemMillimetersCentimeters
AA battery diameter14.5 mm1.45 cm
โ‚ฌ1 coin diameter23.25 mm2.33 cm
Bank card width85.6 mm8.56 cm
A4 paper height297 mm29.7 cm

Lenses and Screens

Camera focal lengths (35 mm, 50 mm) and phone thickness are always quoted in millimeters. A 7.8 mm thick phone is 0.78 cm.

Millimeters to Centimeters Table

Millimeters (mm)Centimeters (cm)
1 mm0.1 cm
2 mm0.2 cm
5 mm0.5 cm
8 mm0.8 cm
10 mm1 cm
12 mm1.2 cm
15 mm1.5 cm
20 mm2 cm
25 mm2.5 cm
30 mm3 cm
50 mm5 cm
75 mm7.5 cm
100 mm10 cm
250 mm25 cm
500 mm50 cm
1,000 mm100 cm

Common Questions

How many mm are in a cm?
10 millimeters.
What is 25 mm in cm?
25 mm is 2.5 cm.
Why do technical drawings use mm instead of cm?
Using one unit for every dimension avoids mix-ups, and millimeters are small enough that most dimensions are whole numbers.
Is a millimeter smaller than a centimeter?
Yes. A millimeter is one tenth of a centimeter.