609 US gallons in US dry barrels
Result
The conversion result is: 609 US gallons is equivalent to 19.9375 US dry barrels.[1]
Conversion formula
How to convert 609 US gallons to US dry barrels?
We know (by definition) that: 1 usgallon ≈ 0.0327380952380952 drybarrel.
We can set up a proportion to solve for the number of US dry barrels.
1 usgallon / 609 usgallon ≈ 0.0327380952380952 drybarrel / x drybarrel
Now, we cross multiply to solve for our unknown x:
x drybarrel ≈ (609 usgallon / 1 usgallon) * 0.0327380952380952 drybarrel → x drybarrel ≈ 19.937499999999975 drybarrel
Conclusion:
609 usgallon ≈ 19.937499999999975 drybarrel

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US dry barrel is equal to 0.0501567398119122 times 609 US gallons.
It can also be expressed as: 609 US gallons is equal to 1 / 0.0501567398119122 US dry barrels.
Approximation
An approximate numerical result would be: six hundred and nine US gallons is about nineteen point nine four US dry barrels, or alternatively, a US dry barrel is about zero point zero five times six hundred and nine US 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.