Convert Centimeters (cm) to Millimeters (mm) instantly — free length converter, no sign-up.
1 cm (centimeters) = 10 mm (millimeters)
mm = cm × 10
To convert 25 centimeters to millimeters, multiply by 10 (25 × 10) — which gives 250 mm.
| Centimeters | Millimeters |
|---|---|
| 1 cm | 10 mm |
| 2 cm | 20 mm |
| 5 cm | 50 mm |
| 10 cm | 100 mm |
| 25 cm | 250 mm |
| 50 cm | 500 mm |
| 100 cm | 1000 mm |
| 500 cm | 5000 mm |
| 1000 cm | 10000 mm |
Length conversions move between the metric system (millimetres, centimetres, metres, kilometres), which is decimal and scales by powers of ten, and the imperial/US customary system (inches, feet, yards, miles), which does not. The metre is the SI base unit and every conversion here is defined against it: the inch has been exactly 25.4 mm since the 1959 international yard and pound agreement, which is why these factors are exact rather than approximate.