Centimeters to Millimeters converter (cm → mm)
21,301 cm = 213,010 mm. 1 cm = 10 mm. Type any value below for an instant answer, or find your number in the conversion chart.
cm to mm formula
Worked example: 5 cm = 50 mm. The defining value behind this factor is documented on our length & distance standards page.
Centimeters to Millimeters chart
Includes standard reference values plus the specific numbers people search for most.
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 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 |
| 15 cm | 150 mm |
| 19 cm | 190 mm |
| 20 cm | 200 mm |
| 22 cm | 220 mm |
| 25 cm | 250 mm |
| 30 cm | 300 mm |
| 32 cm | 320 mm |
| 36 cm | 360 mm |
| 40 cm | 400 mm |
| 50 cm | 500 mm |
| 60 cm | 600 mm |
| 70 cm | 700 mm |
| 75 cm | 750 mm |
| 90 cm | 900 mm |
| 100 cm | 1,000 mm |
| 150 cm | 1,500 mm |
| 200 cm | 2,000 mm |
| 250 cm | 2,500 mm |
| 500 cm | 5,000 mm |
| 1000 cm | 10,000 mm |
Most-searched cm to mm answers
5 cm to mm
50 mm60 cm to mm
600 mm1 cm to mm
10 mm15 cm to mm
150 mm7 cm to mm
70 mm22 cm to mm
220 mm4 cm to mm
40 mm100 cm to mm
1,000 mm12 cm to mm
120 mm75 cm to mm
750 mm200 cm to mm
2,000 mm11 cm to mm
110 mmWhen to convert cm to mm
Use centimeters to millimeters for precise dimensions in schoolwork, crafts, medicine and manufacturing.
- ▸Express a centimeter measurement at a finer millimeter scale.
- ▸Match a drawing or product specification that uses millimeters.
Common mistakes
- ✕One centimeter is exactly 10 millimeters, so no rounding is needed.
- ✕Mixing US and international inches — since 1959 all inches are 25.4 mm exactly; older US "survey foot" values are slightly different.
- ✕Off-by-decimal errors: 1 cm = 10 mm, 1 m = 100 cm — a misplaced decimal turns a cm into a wildly wrong mm.
- ✕Confusing feet with yards (1 yd = 3 ft) in DIY calculations.
- ✕The US survey foot is not the international foot. The US survey foot was 1200/3937 m (about 0.30480061 m) — roughly 2 parts per million longer than the international foot of 0.3048 m. NIST retired it for new work at the end of 2022, but old survey and land records still use it. Over a mile the difference is about 3 mm; over 100 km it is about 200 mm, which matters in surveying and geodesy and nowhere else.
Regional usage & source
Metric units (mm, cm, m, km) are used in most of the world. Imperial units (in, ft, yd, mi) are standard in the US and still common in the UK for road distances and human height.
Reference: Conversion factors are defined by the International System of Units (SI) as maintained by the BIPM (bipm.org) and NIST (nist.gov). 1 inch = exactly 0.0254 meters (international yard and pound agreement, 1959).
How these numbers are produced and rounded: methodology.