18 imperial gallons in US gallons

Result

The conversion result is: 18 imperial gallons is equivalent to 21.6170986590874 US gallons.[1]

Conversion formula
How to convert 18 imperial gallons to US gallons?

We know (by definition) that: 1 imperialgallon ≈ 1.20094992550486 usgallon.

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

1 imperialgallon / 18 imperialgallon ≈ 1.20094992550486 usgallon / x usgallon

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

x usgallon ≈ (18 imperialgallon / 1 imperialgallon) * 1.20094992550486 usgallon → x usgallon ≈ 21.61709865908748 usgallon

Conclusion:

18 imperialgallon ≈ 21.61709865908748 usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 0.0462596769238327 times 18 imperial gallons.

It can also be expressed as: 18 imperial gallons is equal to 1 / 0.0462596769238327 US gallons.

Approximation

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