Abstract: The main difficulty in working with the U.S. length units is in adding or subtracting dimensions and especially when converting them into metric, both in making and in using drawings for general construction and machine technology. These are the problems and the areas Multilane is intended for as an inch keyboard to be incorporated in any functionally adaptable calculator. The resulted professional tool is proposed for convenience in two embodiments: the Nine-Lane with nine built-in units from 1 Ft to 1/128" range and the Six-Lane with six built-in units from 1 Ft to 1/16" range. Taking advantage of their invariability, the units are removed from the keys and written in permanent characters on calculator housing. The result: no keys and no keystrokes for units and consequently Multilane makes use of only 40% of the number of keystrokes required by a conventional inch keyboard for the same entries.