The result of your conversion between horsepower hour and gigajoule appears here
To convert between Horsepower Hour and Gigajoule you have to do the following:
First divide 2684519.5 / 1.0e+09 = 0.00268452
Then multiply the amount of Horsepower Hour you want to convert to Gigajoule, use the chart below to guide you.
Symbol: hph
No description
Symbol: GJ
No description