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