Abstract: A computer adapted for metric conversions from the English system of measurement to metric, and reciprocally back to English from metric, comprising a control panel with dual window to give a simultaneous visual reading of the input and output factors, with control units to switch the conversion control system to one of a series of metric conversion media; said computer having an electronic system with conversion means from English units to metric units, and conversely metric units to English units in each of several physical measurement classifications.