The microinch is a metric unit of length. One microinch equals 2.540000e-8 meters, so every conversion on this page starts from that single number. Metric units are built from the meter with a prefix, so moving between them only ever means shifting the decimal point.

Because the whole system works in powers of ten, you can convert microinch to any other metric unit without memorizing odd numbers. The table further down does the arithmetic for the values people look up most.