Gallons to Cubic Feet Converter
Convert US gallons (gal) to cubic feet (cu ft) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
Gallons to Cubic Feet formula
cu ft = gal ÷ 7.48051948
1 US gallon = 0.1337 cubic feet · 1 cubic foot = 7.48 US gallons
To convert US gallons to cubic feet, divide the value by 7.48051948. For example, 100 gal:
cu ft = 100 ÷ 7.48051948cu ft = 13.368056
So 100 gal = 13.37 cu ft.
Mental math shortcut
Quick mental estimate: divide by 7.5. For 100 gal that gives about 13.33 cu ft — within 1% of the exact answer. Use the exact formula when precision matters.
Gallons to Cubic Feet conversion table
Cubic Feet back to Gallons
The same values converted the other way, rounded for everyday use:
| Cubic feet | US gallons |
|---|---|
| 0.1337 cu ft | 1 gal |
| 0.9999 cu ft | 7.48 gal |
| 1.34 cu ft | 10.02 gal |
| 6.68 cu ft | 49.97 gal |
| 13.37 cu ft | 100.01 gal |
| 66.84 cu ft | 500 gal |
| 133.68 cu ft | 1000 gal |
| 1336.81 cu ft | 10000.03 gal |
About the units
US gallons (gal)
A US gallon is 128 US fluid ounces, exactly 3.785411784 liters. (The UK imperial gallon is 4.546 liters.)
Cubic feet (cu ft)
A cubic foot is 1,728 cubic inches, about 7.48 US gallons or 28.3 liters.
Frequently asked questions
How many cubic feet are in a US gallon?
One US gallon equals 0.1337 cubic feet.
What is 100 Gallons in Cubic Feet?
100 gal = 13.37 cu ft.
How do I convert Cubic Feet back to Gallons?
Multiply the cubic feet by 7.48051948. Or use the Cubic Feet to Gallons converter.