The result of your conversion between Btu and zettajoule appears here
To convert between Btu and Zettajoule you have to do the following:
First divide 1055.0559 / 1.0e+21 = 0.
Then multiply the amount of Btu you want to convert to Zettajoule, use the chart below to guide you.
Symbol: Btu
No description
Symbol: zJ
No description