Units To lays out density units one to a row and amounts one to a column. Opened at milligrams per decilitre, it reads any amount of them at once in kilograms per cubic metre, pounds per cubic foot, grams per cubic centimetre, micrograms per cubic metre, milligrams per litre and every other density unit, even Saturns, Suns and gold. Type an amount the way you would say it, lay out a range of amounts, and choose how many decimal places to show.