To convert fluid ounces to cups, you can use the conversion factor that 1 cup is equal to 8 fluid ounces.
So, to convert 64 fluid ounces to cups:
\[ 64 \text{ fluid ounces} \div 8 \text{ fluid ounces per cup} = 8 \text{ cups} \]
Therefore, 64 fluid ounces is equal to 8 cups.