420 US gallons in US customary cups

Conversion formula
How to convert 420 US gallons to US customary cups?

We know (by definition) that: $1\mathrm{usgallon}\approx 16\mathrm{uscup}$

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

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

Conclusion: 420 ⁢ usgallon ≈ 6720 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.000148809523809524 times 420 US gallons.

It can also be expressed as: 420 US gallons is equal to $\frac{1}{\mathrm{0.000148809523809524}}$ US customary cups.

Approximation

An approximate numerical result would be: four hundred and twenty US gallons is about six thousand, seven hundred and twenty US customary cups, or alternatively, a US customary cup is about zero times four hundred and twenty US gallons.