The result of your conversion between gigacalorie [I.T.] and zettajoule appears here
To convert between Gigacalorie [I.T.] and Zettajoule you have to do the following:
First divide 4186800000 / 1.0e+21 = 0.
Then multiply the amount of Gigacalorie [I.T.] you want to convert to Zettajoule, use the chart below to guide you.
Symbol: Gcal
No description
Symbol: zJ
No description