How many cubic feet of water are in a gallon?
Understand the Problem
The question is asking for a conversion factor between gallons and cubic feet, specifically how many cubic feet are equivalent to one gallon of water.
Answer
0.13368 cubic feet
Answer for screen readers
The final answer is approximately 0.13368 cubic feet per gallon
Steps to Solve

Understand the relationship between gallons and cubic feet
We know that 1 gallon of water is commonly understood to be 231 cubic inches.

Convert cubic inches to cubic feet
There are 12 inches in a foot, so there are (12 \times 12 \times 12 = 1728) cubic inches in a cubic foot.

Set up the conversion factor
Since 1 gallon is 231 cubic inches, we can convert this to cubic feet by dividing by the number of cubic inches in a cubic foot:
$$ \frac{231 \text{ cubic inches}}{1728 \text{ cubic inches/cubic foot}} $$

Calculate the result
Simplify the fraction or use a calculator to find the final answer:
$$ \frac{231}{1728} \approx 0.13368 $$ cubic feet
The final answer is approximately 0.13368 cubic feet per gallon
More Information
A fun fact is that there are different definitions of gallons in the world. The above conversion is based on the U.S. liquid gallon. The Imperial gallon used in the UK is different and would result in another value.
Tips
A common mistake is to confuse the type of gallon being used. Always make sure you are using the correct definition for the gallon, as the U.S. Liquid Gallon and the Imperial Gallon are different.