The **decimetre** (International spelling as used by the International Bureau of Weights and Measures; SI symbol **dm**) or **decimeter** (American spelling) is a unit of length in the metric system, equal to one tenth of a metre, the SI base unit of length (or ten centimetres). Equivalently, there are 10 decimetres in a metre. It can be written in scientific notation as 100×10^{−3} m (engineering notation) or 1 E-1 m (exponential notation) — meaning 100 × 1 mm or 0.1 m respectively. The *c* is pronounced as /s/, unlike in decametre. The common non-SI metric unit of volume, the litre, is defined as one cubic decimetre (however, between 1901 and 1964, there was a slight difference between the two due to the litre being defined with respect to the kilogram rather than the metre).

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