Units To lays out flow rate units one to a row and amounts one to a column. Opened at US gallons per hour, it reads any amount of them at once in litres per minute, US gallons per minute, cubic metres per hour, cubic feet per minute, millilitres per hour and every other flow rate unit, even kitchen taps, Niagara Falls and Amazons. Type an amount the way you would say it, lay out a range of amounts, and choose how many decimal places to show.