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  7. Convert cm to mm

Convert cm to mm

Convert Centimeter (cm) to Millimeter (mm) instantly.

Choose how you want the answer displayed.

1cm=10mm

Quick ConversionConverted
1 cm10 mm
2.54 cm25.4 mm
5 cm50 mm
10 cm100 mm
30 cm300 mm
50 cm500 mm
100 cm1,000 mm
180 cm1,800 mm

Centimeter

A centimeter (cm), also spelled centimetre, is a metric unit of length in the International System of Units. The centi- prefix means one hundredth.

One centimeter is equal to 1/100 of a meter (m), 10 millimeters (mm), and 1/2.54 of an inch.

Same length, two labels

1 cm = 10 mm

cm
00.250.50.751
mm
02.557.510
matchBoth colored scales mark the same physical length, showing the conversion relationship for this pair.

Millimeter

A millimeter is one thousandth of a meter.

Millimeters are widely used where fine physical detail and small tolerances matter.

How to Convert Centimeter to Millimeter

Mathematically, millimeter (mm) = centimeter (cm) multiplied by the conversion factor shown below.

1 cm = 10 mm

1 mm = 0.1 cm

1 cm x 10 = 10 mm

The distance in millimeter (mm) is the distance in centimeter (cm) multiplied by 10.

distance(mm) = distance(cm) x 10

Or:

mm = cm x 10

Formula: value × 10

Example: 15 cm = 150 mm

Example #1

Convert 12 centimeter to millimeter:

12 cm x 10 = 120 mm

Example #2

Convert 72 centimeter to millimeter:

72 cm x 10 = 720 mm

  1. Start with the length in centimeters (cm).
  2. Multiply by 10 to convert centimeters into millimeters.
  3. Keep the result as a whole millimeter value when the centimeter input has one decimal place, and keep decimals only when the source is more precise.

Precision note: The cm to mm factor is exact. The displayed precision should still match the accuracy of the original centimeter measurement.

How many cm in mm and mm in cm

1 cm = 10 mm

1 mm = 0.1 cm

If you are starting with millimeter instead, use the mm to cm page.

Centimeter [cm]Millimeter [mm]
0.1 cm1 mm
0.5 cm5 mm
2 cm20 mm
3 cm30 mm
15 cm150 mm
20 cm200 mm
25 cm250 mm
40 cm400 mm
75 cm750 mm
150 cm1,500 mm
200 cm2,000 mm
250 cm2,500 mm

Common Use Cases for cm to mm

  • Converting product or part dimensions from cm to mm.
  • Preparing craft, sewing, or model measurements where millimeters are easier to mark.
  • Checking small hardware, medical, or drawing dimensions.
  • Changing school or lab measurements into a finer metric unit.

FAQ

How many millimeters are in one centimeter?

One centimeter contains exactly 10 millimeters.

How do I convert cm to mm?

Multiply the centimeter value by 10.

Is 2.5 cm equal to 25 mm?

Yes. 2.5 centimeters is exactly 25 millimeters.

More Centimeter conversions

  • cm to km
  • cm to meters
  • cm to miles
  • cm to yards
  • cm to feet
  • cm to inches
  • cm to nautical mile