991 US gallons in US customary cups

Conversion formula
How to convert 991 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: 991 ⁢ usgallon ≈ 15856 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 6.30676084762866e-05 times 991 US gallons.

It can also be expressed as: 991 US gallons is equal to $\frac{1}{\mathrm{6.30676084762866e-05}}$ US customary cups.

Approximation

An approximate numerical result would be: nine hundred and ninety-one US gallons is about fifteen thousand, eight hundred and fifty-six US customary cups, or alternatively, a US customary cup is about zero times nine hundred and ninety-one US gallons.