Mass of moon is 7.35x10^22 kg
Speed of light is 2.99792x10^8 m/sec
E = Mc^2 = 6.60x10^39 joules
Olympic pool capacity = 660000 gal
Energy content of gasoline = 1.213x10^8 joules/gal
Gallons of gasoline in mass-energy of moon = 5.44x10^31
Olympic pools full of gasoline per mass-energy of moon = 8.25x10^25.
82.5 septillion Olympic pools worth of gasoline equals the amount of energy you'd get by converting the entire moon to pure energy.