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