How do I convert US fluid ounces back to US cups?

Use the reverse converter: 1 US fluid ounce equals 0.125 cup.

Is this converter accurate?

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert US cups to US fluid ounces, multiply the value by 8.

US fl oz = cup × 8

40 cup × 8 = 320 US fl oz

Note: "cup" here means the US cup (about 236.6 mL). Metric cups (250 mL), imperial cups and US/UK fluid ounces are listed as separate units.

US Cup (cup): The US customary cup (about 236.588 mL), the default "cup" in American recipes.
US Fluid Ounce (US fl oz): A US liquid measure of about 29.5735 mL, one sixteenth of a US pint.

How do I convert US cups to US fluid ounces?: To convert US cups to US fluid ounces, multiply the value by 8.
How many US fluid ounces are in 1 US cup?: 1 US cup equals 8 US fl oz.
How many US fluid ounces are in 10 US cups?: 10 cup equals 80 US fl oz.
How do I convert US fluid ounces back to US cups?: Use the reverse converter: 1 US fluid ounce equals 0.125 cup.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.