How to convert gallons to cubic feet
Formula: ft³ = gal × 0.133681
Worked example: 5 gal → 5 × 0.133681 = 0.668403 ft³
One cubic foot holds 7.48 US gallons. To find how much water a pool or tank holds, compute its volume in cubic feet (length × width × average depth) and multiply by 7.48: a 20 × 10 × 5 ft pool holds about 7,481 gallons.
Gallons to cubic feet conversion chart
| Gallons (gal) | Cubic feet (ft³) |
|---|---|
| 1 gal | 0.133681 ft³ |
| 2 gal | 0.267361 ft³ |
| 3 gal | 0.401042 ft³ |
| 4 gal | 0.534722 ft³ |
| 5 gal | 0.668403 ft³ |
| 6 gal | 0.802083 ft³ |
| 7 gal | 0.935764 ft³ |
| 8 gal | 1.06944 ft³ |
| 9 gal | 1.20312 ft³ |
| 10 gal | 1.33681 ft³ |
| 12 gal | 1.60417 ft³ |
| 15 gal | 2.00521 ft³ |
| 20 gal | 2.67361 ft³ |
| 25 gal | 3.34201 ft³ |
| 30 gal | 4.01042 ft³ |
| 40 gal | 5.34722 ft³ |
| 50 gal | 6.68403 ft³ |
| 75 gal | 10.026 ft³ |
| 100 gal | 13.3681 ft³ |
| 250 gal | 33.4201 ft³ |
| 500 gal | 66.8403 ft³ |
| 1,000 gal | 133.681 ft³ |
What is a gallon?
The US gallon is defined as 231 cubic inches, exactly 3.785411784 liters, and holds 4 quarts or 128 fluid ounces. Gasoline, milk, paint and water use in the United States are measured in gallons.
What is a cubic foot?
The cubic foot holds about 28.3 liters or 7.48 US gallons. Americans use it for refrigerator and freezer capacity, moving trucks, bagged soil and natural gas billing, where one CCF is 100 cubic feet.