Energy and work converter app for iPhone and iPad

Use this useful tool to convert energy and work choosing one of the 53 units of measurment included in this app (with the availability to add custom units), that are:
joule, gigajoule, megajoule, kilojoule, millijoule, microjoule, nanojoule, attojoule, megaelectron-volt, kiloelectron-volt, electron-volt, erg, gigawatt-hour, megawatt-hour, kilowatt-hour, kilowatt-second, watt-hour, watt-second, newton meter, hoursepower hour, horsepower (metric) hour, kilocalorie (IT), kilocalorie (th), calorie (IT), calorie (th), calorie (nutritional), Btu (IT), Btu (th), mega Btu (IT), ton-hour (refrigeration), fuel oil equivalent @kiloliter", fuel oil equivalent @barrel, gigaton, megaton, kiloton, ton (explosives), dyne centimeter, gram-force meter, gram-force centimeter, kilogram-force centimeter, kilogram-force meter, kilopond meter, pound-force foot, pund-force inch, ounce-force inch, foot-pound, inch-pound, inch-ounce, Rydberg constant, Hartree energy, therm, therm (EC), therm (US).

For every units of measurment are also included formulas to convert that unit as you want.