| Symbol: | dm |
| Standard: | SI |
| Quantity: | length |
| Units1: | SI base units |
| Units2: | imperial/US units |
| Inunits2: | 1dm 1dm |
The decimetre (or English: decimeter in American English; symbol: dm), is a unit of length in the International System of Units, equal to one tenth of a metre, ten centimetres, one hundred millimetres, and 3.937 inches.[1]
The common non-SI metric unit of volume, the litre, is defined as one cubic decimetre, although, from 1901 to 1964, there was a slight difference between the two due to the litre being defined using the kilogram rather than the metre.
Markings of a ship's draft are shown in decimeters in most of the world.