Convert cubic feet to gallons or gallons to cubic feet, with options for cubic meters, inches, yards, liters, US quarts and imperial gallons.
Assumptions Assumptions
- Conversions are volume-to-volume only—no mass or temperature compensation.
- Standard definitions: 1 ft³ = 28.316846592 L; 1 US gal = 3.785411784 L; 1 Imp gal = 4.54609 L; 1 US qt = 0.946352946 L.
- Results are rounded to 4 decimals in the calculator; the table shows 3-decimal rounding.
- Select the correct gallon type (US vs Imperial); they differ by about 20%.
When to Use This Calculator
- Sizing tanks, aquariums, and reservoirs measured in cubic feet but specified in gallons.
- Converting construction or landscaping volumes (ft³, yd³) to liquid capacities.
- Standardizing specs across US, Imperial, and metric units using liters as a bridge.
Input Definitions
- Cubic Feet — choose ft³, m³, in³, yd³, or enter directly in liters.
- Gallons — choose US gallon, Imperial gallon, US quart, or liters.
- Conversions — US: gal = ft³ × 7.48052; ft³ = gal ÷ 7.48052. General: target = source × (L per source unit ÷ L per target unit).
Cubic Feet to Gallons Formula
The following formulas convert cubic feet to gallons and back; US customary units are shown first, followed by a general method using liters.
gal = 7.48052 ft³
ft³ = (gal) / (7.48052)
- 1 cubic foot = 28.316846592 L
- 1 cubic meter = 1000 L
- 1 cubic inch = 0.016387064 L
- 1 cubic yard = 764.554857984 L
- 1 US gallon = 3.785411784 L
- 1 Imperial gallon = 4.54609 L
- 1 US quart = 0.946352946 L
How do you convert cubic feet to gallons? Multiply cubic feet by 7.48052 to get US gallons; for Imperial gallons, multiply by 6.22883.
How do you convert gallons to cubic feet? Divide US gallons by 7.48052 (or Imperial gallons by 6.22883) to get cubic feet.
Cubic Feet to Gallons Conversion Table
| Cubic feet (ft³) | Gallons (US) |
|---|---|
| ⅛ | 0.935 |
| 1/6 | 1.247 |
| ¼ | 1.870 |
| ⅓ | 2.494 |
| ⅜ | 2.805 |
| ½ | 3.740 |
| ⅝ | 4.675 |
| ⅔ | 4.987 |
| ¾ | 5.610 |
| ⅞ | 6.545 |
| 1 | 7.481 |
| 1¼ | 9.351 |
| 1⅓ | 9.974 |
| 1½ | 11.221 |
| 1¾ | 13.091 |
| 2 | 14.961 |
| 2½ | 18.701 |
| 3 | 22.442 |
| 4 | 29.922 |
| 5 | 37.403 |
| 10 | 74.805 |
| * US customary: 1 ft³ = 7.48052 gallons. | |
Example Problem
Convert 3.2 cubic feet to US gallons.
Use the US formula: gal = ft³ × 7.48052.
gal = 3.2 × 7.48052 = 23.138 gal
