Units To lays out speed units one to a row and amounts one to a column. Opened at metres per second, it reads any amount of them at once in kilometres per hour, miles per hour, knots, feet per second, minutes per kilometre and every other speed unit, even garden snails, walking paces, Usain Bolts and cheetahs. Type an amount the way you would say it, lay out a range of amounts, and choose how many decimal places to show.