延米(英语:Lane meterlinear meter)是一个虚拟的量度单位,原用于运输业,以将货物的长度换算为所占地的面积。根据美国北卡罗来纳大学系统How Many? A Dictionary of Units of MeasurementLane meter的定义为[1]

A unit of deck area for "roll on/roll off" ships: cargo vessels designed so that containers or other cargo can be rolled on and off the decks of the ship. A lane is a strip of deck 2 metres wide. A lane metre is an area of deck one lane wide and one metre long, that is, 2平方米(21.528平方英尺).

意思就是:

一般来说,一辆私家车会占用六延米,而一辆欧洲的载货汽车会占去18延米。 这种量度的转换后来从货运业延伸到其他领域,以比照其所占面积及所需数量的总长度[2]。举例说,在建筑材料行业,某项如隔热棉地毡之类的材料需要覆盖15平方米的面积。如果这些材料来货时的阔度有半米,那就需要30延米的材料。

这个概念延伸至图书馆的藏书量时,又会假设一册书若以最常见的标准厚度和尺寸,所推算出来的长度或面积。

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