How many US cups are in 1 US fluid ounce?

1 US fluid ounce equals 0.125 cup.

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

Use the reverse converter: 1 US cup equals 8 US fl oz.

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

To convert US fluid ounces to US cups, multiply the value by 0.125.

cup = US fl oz × 0.125

40 US fl oz × 0.125 = 5 cup

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

How do I convert US fluid ounces to US cups?: To convert US fluid ounces to US cups, multiply the value by 0.125.
How many US cups are in 1 US fluid ounce?: 1 US fluid ounce equals 0.125 cup.
How many US cups are in 10 US fluid ounces?: 10 US fl oz equals 1.25 cup.
How do I convert US cups back to US fluid ounces?: Use the reverse converter: 1 US cup equals 8 US fl oz.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.