This energy unit converter can calculate between measurements such as: Btu (th), Btu (mean), calories (IT), calories (th), calories (mean), calories (15C), calories (20C), calories (food), centigrade heat units, electron volts [eV], ergs, foot-pound force [ft lbf], foot poundals, gigajoules [GJ], horsepower hours, inch-pound force [in lbf], joules [J], kilocalories (IT), kilocalories (th), kilogram-force meters, kilojoules [kJ], kilowatt hours [kWh], megajoules [MJ], newton meters [Nm], therms, and watt seconds [Ws].