The result of your conversion between Btu and hartree appears here
To convert between Btu and Hartree you have to do the following:
First divide 1055.0559 / 4.3597482e-18 = 241999274178265645056.
Then multiply the amount of Btu you want to convert to Hartree, use the chart below to guide you.
Symbol: Btu
No description
Symbol: Eh
No description