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Decimeter(dm)

The decimeter is a metric length unit equal to one-tenth of a meter.

Reviewed September 4, 2026

Symbol: dm
Quantity: Length
Measurement system: SI
SI classification: Prefixed SI unit
Reference unit: Meter
Exact relationship: 1 dm = 0.1 m exactly

Visualizing decimeter

The marked distance represents a length of 1 dm. The illustration is conceptual and not drawn to physical scale.

What the decimeter is

The decimeter is a metric unit for lengths between the centimeter and meter, commonly used in education and measurement practice.

Convert Decimeter