8 US cups to US fluid ounces
64.00 fl oz
8 cup = 64.00 fl oz.
US fluid ounces
64.00fl oz
8 cup = 64.00 fl oz
In short
How many US fluid ounces is 8 US cups?
8 cup = 64.00 fl oz. 1 US cup = 8.000000 US fluid ounces, so the working is 8 × 8.000000 = 64.00.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 US cup = 8.000000 US fluid ounces 8 × 8.000000 = 64.00
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (fl oz) | Off by |
|---|---|---|
| Whole number | 64 | exact |
| 1 decimal | 64.0 | exact |
| 2 decimals | 64.00 | exact |
Round trip: take 64.00 fl oz back the other way and you land on 8.0000 cup — a drift of 0.0000 cup. That gap is the rounding, not the conversion.
Frequently asked questions
What is 8 US cups in US fluid ounces?
8 US cups is 64.00 US fluid ounces. 1 US cup = 8.000000 US fluid ounces, so the working is 8 × 8.000000 = 64.00.
How accurate is 64.00 fl oz?
Rounding to 64.00 fl oz and converting straight back gives 8.0000 cup, a drift of 0.0000 cup from the 8 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Cups to Ounces Converter
Convert US cups to fluid ounces — the eight-ounce cup, and where the metric cup differs.
Open the cups to ounces converter →