21 US gallons in dry gallons

Result

The conversion result is: 21 US gallons is equivalent to 18.0467071548814 dry gallons.[1]

Conversion formula
How to convert 21 US gallons to dry gallons?

We know (by definition) that: 1 usgallon ≈ 0.859367007375303 drygallon.

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

1 usgallon / 21 usgallon ≈ 0.859367007375303 drygallon / x drygallon

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

x drygallon ≈ (21 usgallon / 1 usgallon) * 0.859367007375303 drygallon → x drygallon ≈ 18.046707154881364 drygallon

Conclusion:

21 usgallon ≈ 18.046707154881364 drygallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 dry gallon is equal to 0.0554117707689136 times 21 US gallons.

It can also be expressed as: 21 US gallons is equal to 1 / 0.0554117707689136 dry gallons.

Approximation

An approximate numerical result would be: twenty-one US gallons is about eighteen point zero five dry gallons, or alternatively, a dry gallon is about zero point zero six times twenty-one 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.