Fluid Ounces to Cups Calculator

Convert U.S. fluid ounces (fl oz) to U.S. customary cups. The relationship is exact: 8 U.S. fluid ounces equal 1 U.S. customary cup. The result is rounded to four decimal places.

This is a volume conversion, not a conversion from ounces by weight. Other cup systems use different volumes.

1. Enter a nonnegative amount in U.S. fluid ounces (fl oz).
2. Choose Calculate. The calculator divides the input by 8.
3. Read the equivalent volume in U.S. customary cups, rounded to four decimal places.

For example, 16 U.S. fl oz ÷ 8 = 2 U.S. customary cups. Use the same cup convention when comparing with a recipe or reference.

The output expresses the entered volume in U.S. customary cups. The calculator accepts U.S. fluid ounces, a volume unit. Ounces used to measure mass cannot be converted to cups without additional information about the material’s density.

A U.S. customary cup is 8 U.S. fluid ounces (236.5882365 mL). A metric cup is 250 mL, so it is not identical. Check the convention used by the recipe or specification.

The page rounds to four decimal places. Use the unrounded relationship for follow-on calculations when available and match the final precision to the original measurement.