21 dry gallons in US customary cups

Result

The conversion result is: 21 dry gallons is equivalent to 390.985454545455 US customary cups.[1]

Conversion formula
How to convert 21 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 / 21 drygallon ≈ 18.618354978355 uscup / x uscup

Now, we cross multiply to solve for our unknown x:

x uscup ≈ (21 drygallon / 1 drygallon) * 18.618354978355 uscup → x uscup ≈ 390.985454545455 uscup

Conclusion:

21 drygallon ≈ 390.985454545455 uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.00255763990290269 times 21 dry gallons.

It can also be expressed as: 21 dry gallons is equal to 1 / 0.00255763990290269 US customary cups.

Approximation

An approximate numerical result would be: twenty-one dry gallons is about three hundred and ninety point nine nine US customary cups, or alternatively, a US customary cup is about zero times twenty-one 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.