The result of your conversion between Btu and gigacalorie [I.T.] appears here
To convert between Btu and Gigacalorie [I.T.] you have to do the following:
First divide 1055.0559 / 4186800000 = 0.00000025
Then multiply the amount of Btu you want to convert to Gigacalorie [I.T.], use the chart below to guide you.
Symbol: Btu
No description
Symbol: Gcal
No description