A metric ruler is the standard instrument for measurement in the scientific laboratory. On a metric ruler, each individual line represents a millimeter (mm). The numbers on the ruler represent centimeters (cm). There are *10 millimeters* for each centimeter.

Actual *size* of Online *Ruler* (cm/mm). 30CM / 300mm. width:300.0mm (11.81Inch). full screen drag it iframe embed. +. Actual *size* image of Online *Ruler* (cm/mm) .

Rulers are often *30 centimeters* long, which are designated by large numbers on the ruler. Between each centimeter (cm) mark, there should be 10 smaller marks called millimeters (mm).

This is a convenient online *ruler* that could be calibrated to actual *size*, measurements in cm, mm and inch, the upper half is the millimeter *ruler* and *centimeter* .

The conversion between inches and *centimeters* is given more precisely in the vCalc equation: *Length* Conversion You just input the *length* you wish to convert