Convert 4 Btu (th)/hour to Femtowatt: 4 Btu (th)/hour in Femtowatt
This calculator allows you to convert from Btu (th)/hour to Femtowatt and in a reverse direction. To convert from Btu (th)/hour to Femtowatt, enter the amount of Btu (th)/hour into the first input and to convert from Femtowatt to Btu (th)/hour, enter the amount of Femtowatt into the second input.