US Fluid Ounces to Cups
Convert US fluid ounces to US cups and back, instantly.
Convert within US customary volume
US fluid ounces and US cups are both volume measures used in recipes, beverages, and container labels. Eight US fluid ounces make one US cup exactly. This page keeps the regional system explicit and does not confuse fluid ounces with ounces by weight.
The default 8 US fluid ounces converts to exactly 1 US cup. Reversing direction converts 1 cup to exactly 8 fluid ounces. Since both sides measure volume in the same system, ingredient density is irrelevant to this particular conversion.
Private kitchen conversion with regional clarity
The amount stays in your browser and no recipe is uploaded. This factor does not apply to imperial fluid ounces or metric cups. It also does not convert an ingredient to grams, because volume-to-mass conversion requires knowing the ingredient density.
Frequently Asked Questions
How many US fluid ounces are in one cup?
One US customary cup contains exactly eight US fluid ounces.
Does this measure weight ounces?
No. Fluid ounces and cups both measure volume. Weight ounces require an ingredient density.
Can I use imperial fluid ounces?
No. The imperial fluid ounce and cup use different definitions, so this page labels the US units explicitly.
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