Volume conversion
40 fl oz to cups
5 cups
40 US fluid ounces = 5 US cups. Exact factor: cups = fl oz ÷ 8.
Live converter
Edit either field — the other updates instantly. Type decimal values like 38.4.
The formula
cups = fl oz ÷ 8
Worked example: 40 × 0.125 = 5 cups.
Values near 40 fl oz
| fl oz | cups |
|---|---|
| 37 | 4.625 |
| 38 | 4.75 |
| 39 | 4.875 |
| 40this page | 5 |
| 41 | 5.125 |
| 42 | 5.25 |
| 43 | 5.375 |
Frequently asked
How do you convert US fluid ounces to US cups?
Apply the formula cups = fl oz ÷ 8. Enter any value in the live converter above and the result updates as you type.
What is 40 fl oz in cups?
40 fl oz equals 5 cups. The reference table below shows the values immediately around 40 fl oz.
Is this conversion exact?
Yes. If a recipe gives ounces for a dry ingredient it usually means weight, not fluid ounces — check before pouring.