18 US quarts in US gallons

Conversion

18 US quarts is equivalent to 4.5 US gallons.^[1]

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

We know (by definition) that: $1 usquart \approx 0.25 usgallon$

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

\frac{1 usquart}{18 usquart} \approx \frac{0.25 usgallon}{x usgallon}

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

x usgallon \approx \frac{18 usquart}{1 usquart} * 0.25 usgallon \to x usgallon \approx 4.5 usgallon

Conclusion: $18 usquart \approx 4.5 usgallon$

18 US quarts is equivalent to 4.5 US gallons

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 0.222222222222222 times 18 US quarts.

It can also be expressed as: 18 US quarts is equal to $\frac{1}{0.222222222222222}$ US gallons.

Approximation

An approximate numerical result would be: eighteen US quarts is about zero US gallons, or alternatively, a US gallon is about zero point two two times eighteen US quarts.

Units involved

This is how the units in this conversion are defined:

Us Quarts

"All traditional U.S. length and volume measures have been legally standardized for commerce by the international yard and pound agreement of 1959 using the definition of 1 yard being exactly equal to 0.9144 meter."

Wikipedia page of US quarts

Us Gallons

"The US gallon is legally defined as 231 cubic inches, which is exactly 3.785411784 liters.[2][3] A US liquid gallon of water weighs about 8.34 pounds or 3.78 kilograms at 62 °F (17 °C), making it about 16.6% lighter than the imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes the US fluid ounce equal to 1⁄128 of a US gallon."

Wikipedia page of 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.

Conversion

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

Conversion in the opposite direction

Approximation

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