The result of your conversion between femtojoule and Btu [thermochemical] appears here
To convert between Femtojoule and Btu [thermochemical] you have to do the following:
First divide 1.0e-15 / 1054.3503 = 0.
Then multiply the amount of Femtojoule you want to convert to Btu [thermochemical], use the chart below to guide you.
Symbol: fJ
No description
Symbol: Btu
No description