Units To lays out energy units one to a row and amounts one to a column. Opened at british thermal units, it reads any amount of them at once in kilowatt-hours, kilocalories, joules, kilojoules, watt-hours and every other energy unit, even AA batteries, Big Macs and lightning bolts. Type an amount the way you would say it, lay out a range of amounts, and choose how many decimal places to show.