Converters

cm to mm Converter

Convert centimeters to millimeters fast using the exact metric standard (1 cm = 10 mm). Control rounding, decimals, and build a quick cm→mm table.

Exact Metric Decimal cm Rounding Table

Centimeters (cm) to Millimeters (mm) Converter

Convert cm to mm precisely, with an optional mm-to-cm mode and a conversion table you can copy.

Centimeters (cm)

Decimal Places

Rounding

Show Steps

The conversion is exact: 1 centimeter equals 10 millimeters. Only rounding affects the displayed number of decimals.

Millimeters (mm)

Decimal Places

Rounding

Show Steps

mm→cm is also exact: divide by 10. Use this when a drawing or spec is in mm and you need cm for quick reading.

Start (cm)

End (cm)

Step (cm)

Decimal Places

Tip: Use 0.1 cm steps for fine detail, or 1 cm steps for quick reference.

Exact metric standard: 1 cm = 10 mm.

mm = cm × 10

cm = mm ÷ 10

Since 1 m = 100 cm and 1 m = 1000 mm, you can also move between units by shifting decimals:

cm → m: divide by 100
mm → m: divide by 1000