ConvBolt — Unit ConverterCentimeters to Millimeters Converter
Converting centimeters to millimeters is a multiplication by a fixed factor: 1 cm = 10 mm. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one centimeter works out to 10 mm, the millimeter is the noticeably larger unit of the two: a figure given in millimeter always carries a larger number than the same measurement in centimeter. A chart drawn in cm can hide that, so check which label the axis uses before you compare two readings.
DIY and home-improvement work is where this pair shows up most: you measure in centimeters but the hardware store or an imported product sheet quotes millimeters, so the conversion has to be right the first time.
The conversion factor used here is 10 mm per centimeter (0 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 cm a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 0.1 cm per mm, the exact reciprocal, so a round trip through both pages returns your original number.
Centimeters to Millimeters formula
Use this formula to convert any centimeter value to millimeters:
Worked example: 100 cm × 10 = 1000 mm.
Centimeters to Millimeters conversion table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.5 cm | 5 mm |
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 20 cm | 200 mm |
| 50 cm | 500 mm |
| 100 cm | 1000 mm |
| 500 cm | 5000 mm |
| 1000 cm | 10000 mm |
How to convert centimeters to millimeters
Multiply the centimeter value by 10 to get the equivalent in millimeters. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Millimeters to Centimeters converter instead of dividing by hand; both pages use the same source factors. For every other cm conversion in one place, see the cm conversion hub.
Frequently asked questions
How many millimeters are in 1 centimeter?
1 centimeter = 10 mm.
What is 100 centimeters in millimeters?
100 cm = 1000 mm.
Is converting centimeters to millimeters the same as millimeters to centimeters?
No — the direction changes the multiplier. The reverse conversion (1 mm = 0.1 cm) is on the Millimeters to Centimeters page.
Related conversions
Try the ConvBolt Unit Converter for any other length unit, browse the Length conversions, or read our conversion guides.