40 US fluid ounces to US cups
5.000 cup
40 fl oz = 5.000 cup.
US cups
5.000cup
40 fl oz = 5.000 cup
In short
How many US cups is 40 US fluid ounces?
40 fl oz = 5.000 cup. 1 US fluid ounce = 0.125000 US cups, so the working is 40 × 0.125000 = 5.000.
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 fluid ounce = 0.125000 US cups 40 × 0.125000 = 5.000
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 (cup) | Off by |
|---|---|---|
| Whole number | 5 | exact |
| 1 decimal | 5.0 | exact |
| 2 decimals | 5.00 | exact |
Round trip: take 5.000 cup back the other way and you land on 40.0000 fl oz — a drift of 0.0000 fl oz. That gap is the rounding, not the conversion.
Frequently asked questions
What is 40 US fluid ounces in US cups?
40 US fluid ounces is 5.000 US cups. 1 US fluid ounce = 0.125000 US cups, so the working is 40 × 0.125000 = 5.000.
How accurate is 5.000 cup?
Rounding to 5.000 cup and converting straight back gives 40.0000 fl oz, a drift of 0.0000 fl oz from the 40 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
Ounces to Cups Converter
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