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