Convert mm to cm

Millimeter

Definition
A millimeter (symbol: mm) is an SI unit of length equal to one-thousandth of a meter (0.001 m). It corresponds to the distance light travels in 1 / 299 792 458 000 of a second, ensuring exactness through the meter’s constant-based definition.

Origin
The prefix milli- (Latin mille, “thousand”) denotes 10⁻³ in the metric system. While the meter itself has evolved—from a platinum-iridium bar to a light-based standard—the fixed relationship (1 mm = 0.001 m) remains unchanged.

Modern Use
Millimeters are indispensable for precise measurements: engineering tolerances, technical drawings, machining parts, and any application requiring fine granularity.

Centimeter

Definition
A centimeter (symbol: cm) is an SI unit of length equal to one-hundredth of a meter (0.01 m). It’s a convenient subdivision of the meter for everyday and scientific measurements alike.

Origin
Formed by combining the centi- prefix (Latin centum, “hundred”) with “meter,” the centimeter is part of the metric system’s decimal structure, making unit conversions straightforward.

Modern Use
Centimeters are used globally for measuring dimensions too small for meters but larger than millimeters—heights on medical charts, small object dimensions, classroom rulers, and more.

Millimeter → Centimeter Conversion Table

How to Convert

• 1 mm = 0.1 cm

• 1 cm = 10 mm

Example

To convert 15 mm to centimeters:

15 mm × 0.1 cm/mm = 1.5 cm