CM to MM Converter
1 centimeter = 10 millimeters exactly.
Use this free browser reference to convert centimeters to millimeters. The math is deterministic and does not require a server request.
Formula
cm × 10 = mm
Enter the source number, apply the formula, then round only at the end. Keep more decimals for engineering or craft measurements; use one or two decimals for quick everyday checks.
Quick reference table
| Input | Converted value |
|---|---|
| 1 centimeters | 10 millimeters |
| 2 centimeters | 20 millimeters |
| 5 centimeters | 50 millimeters |
| 10 centimeters | 100 millimeters |
| 30 centimeters | 300 millimeters |
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FAQ
What is the formula?
cm × 10 = mm
How should I round the answer?
For display, round to one or two decimals. For measurement work, keep the full calculation until your final step.