This calculator allows you to convert from Femtojoule/second to Kilocalorie (IT)/hour and in a reverse direction. To convert from Femtojoule/second to Kilocalorie (IT)/hour, enter the amount of Femtojoule/second into the first input and to convert from Kilocalorie (IT)/hour to Femtojoule/second, enter the amount of Kilocalorie (IT)/hour into the second input.