40 dry gallons in US customary cups
Result
The conversion result is: 40 dry gallons is equivalent to 744.734199134199 US customary cups.[1]
Conversion formula
How to convert 40 dry gallons to US customary cups?
We know (by definition) that: 1 drygallon ≈ 18.618354978355 uscup.
We can set up a proportion to solve for the number of US customary cups.
1 drygallon / 40 drygallon ≈ 18.618354978355 uscup / x uscup
Now, we cross multiply to solve for our unknown x:
x uscup ≈ (40 drygallon / 1 drygallon) * 18.618354978355 uscup → x uscup ≈ 744.7341991342 uscup
Conclusion:
40 drygallon ≈ 744.7341991342 uscup

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary cup is equal to 0.00134276094902391 times 40 dry gallons.
It can also be expressed as: 40 dry gallons is equal to 1 / 0.00134276094902391 US customary cups.
Approximation
An approximate numerical result would be: forty dry gallons is about seven hundred and forty-four point seven three US customary cups, or alternatively, a US customary cup is about zero times forty dry gallons.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.