688 US dry barrels in US gallons

Conversion formula
How to convert 688 US dry barrels to US gallons?

We know (by definition) that: $1\mathrm{drybarrel}\approx 30.5454545454545\mathrm{usgallon}$

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

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

Conclusion: 688 ⁢ drybarrel ≈ 21015.272727272695 ⁢ usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 4.75844407530454e-05 times 688 US dry barrels.

It can also be expressed as: 688 US dry barrels is equal to $\frac{1}{\mathrm{4.75844407530454e-05}}$ US gallons.

Approximation

An approximate numerical result would be: six hundred and eighty-eight US dry barrels is about twenty-one thousand and fifteen point two seven US gallons, or alternatively, a US gallon is about zero times six hundred and eighty-eight US dry barrels.