The result of your conversion between gram calorie and petajoule appears here
To convert between Gram Calorie and Petajoule you have to do the following:
First divide 4.1858 / 1.0e+15 = 0.
Then multiply the amount of Gram Calorie you want to convert to Petajoule, use the chart below to guide you.
Symbol: g cal
No description
Symbol: PJ
No description