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