21 US customary cups in US gallons

Result

The conversion result is: 21 US customary cups is equivalent to 1.3125 US gallons.[1]

Conversion formula
How to convert 21 US customary cups to US gallons?

We know (by definition) that: 1 uscup ≈ 0.0625 usgallon.

We can set up a proportion to solve for the number of US gallons.

1 uscup / 21 uscup ≈ 0.0625 usgallon / x usgallon

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

x usgallon ≈ (21 uscup / 1 uscup) * 0.0625 usgallon → x usgallon ≈ 1.3125 usgallon

Conclusion:

21 uscup ≈ 1.3125 usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 0.761904761904762 times 21 US customary cups.

It can also be expressed as: 21 US customary cups is equal to 1 / 0.761904761904762 US gallons.

Approximation

An approximate numerical result would be: twenty-one US customary cups is about one point three one US gallons, or alternatively, a US gallon is about zero point seven six times twenty-one US customary cups.

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.