2 cm = 20 mm (centimeter → millimeter)
2 cm = 20 mm
2 centimeters (cm) equals 20 millimeters (mm). The conversion uses the exact factor 10: 2 × 10 = 20.
Millimeters = Centimeters × 10How 2 centimeters compares to its arithmetic neighbours, converted to millimeters.
| Relation | centimeters | millimeters |
|---|---|---|
| ÷10 | 0.2 cm | 2 mm |
| ÷2 (half) | 1 cm | 10 mm |
| ×1 (this value) | 2 cm | 20 mm |
| ×2 (double) | 4 cm | 40 mm |
| ×5 | 10 cm | 100 mm |
| ×10 | 20 cm | 200 mm |
Centimetres to millimetres multiplies by 10. A 15 cm ruler segment is 150 mm; a 2.4 cm coin is 24 mm. Move to millimetres whenever you need finer resolution — fastener diameters, PCB layouts, and precision parts are all specified in millimetres because centimetres are too coarse. The conversion is exact and decimal; the risk is dropping or adding a zero, which shifts the result by a factor of ten.
Woodworkers buying dowel stock see diameters listed in centimetres on the supplier's price list but need millimetres to match a drill bit index, which is graduated in whole and half millimetres. A 1.2 cm dowel needs a 12 mm bit, not the nearest 1/2 in bit at 12.7 mm — using the imperial bit leaves the joint loose. Always convert to millimetres before walking to the bit drawer; centimetre stock sizes rarely land on a convenient inch fraction.
Start with your value in centimeters.
Multiply the centimeter value by 10. This is the exact conversion factor from centimeters to millimeters.
The product is your value in millimeters. For example, 5 cm × 10 = 50 mm.
The exact factor from centimeters to millimeters is 10.
Millimeters = Centimeters × 10
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 cm | 1 mm |
| 0.25 cm | 2.5 mm |
| 0.5 cm | 5 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 |
| 13 cm | 130 mm |
| 14 cm | 140 mm |
| 15 cm | 150 mm |
| 16 cm | 160 mm |
| 18 cm | 180 mm |
| 20 cm | 200 mm |
| 22 cm | 220 mm |
| 24 cm | 240 mm |
| 25 cm | 250 mm |
| 28 cm | 280 mm |
| 30 cm | 300 mm |
| 32 cm | 320 mm |
| 36 cm | 360 mm |
| 40 cm | 400 mm |
| 45 cm | 450 mm |
| 48 cm | 480 mm |
| 50 cm | 500 mm |
| 60 cm | 600 mm |
| 70 cm | 700 mm |
| 75 cm | 750 mm |
| 80 cm | 800 mm |
| 90 cm | 900 mm |
| 100 cm | 1000 mm |
| 125 cm | 1250 mm |
| 150 cm | 1500 mm |
| 200 cm | 2000 mm |
| 250 cm | 2500 mm |
| 300 cm | 3000 mm |
| 400 cm | 4000 mm |
| 500 cm | 5000 mm |
| 600 cm | 6000 mm |
| 750 cm | 7500 mm |
| 800 cm | 8000 mm |
| 900 cm | 9000 mm |
| 1000 cm | 10000 mm |
A US quarter is about 2.4 cm wide. An adult thumb is around 6 cm long. A typical smartphone is 14–16 cm tall. In millimeters, that gives you: 1 cm = 10 mm, 10 cm = 100 mm, 100 cm = 1000 mm.
The centimeter (cm) is a metric unit of length equal to one-hundredth of a meter. It is the most common everyday unit outside the US for measuring small to mid-sized objects, body dimensions like height when stated in metric, fabric, and TV diagonals. A US quarter coin is about 2.4 cm wide; an average adult thumb is around 6 cm long.
The millimeter (mm) is a metric unit of length equal to one-thousandth of a meter. It is the working unit of engineering drawings, precision manufacturing, electronics, and most consumer-goods specifications outside the United States. A credit card is about 0.76 mm thick; the diameter of a pencil lead is around 2 mm.
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