Convert Cubic Foot to US Gallon (ft³ → gal (US))
The cubic foot is the American standard for HVAC capacity, natural gas billing, and refrigerator volume.
Cubic Foot to US Gallon Conversion Table
10 common values| Cubic Foot | US Gallon |
|---|---|
| 1 ft³ | 7.48052 gal (US) |
| 2 ft³ | 14.961039 gal (US) |
| 5 ft³ | 37.402597 gal (US) |
| 10 ft³ | 74.805195 gal (US) |
| 20 ft³ | 149.61039 gal (US) |
| 50 ft³ | 374.02597 gal (US) |
| 100 ft³ | 748.05195 gal (US) |
| 200 ft³ | 1,496.1039 gal (US) |
| 500 ft³ | 3,740.2597 gal (US) |
| 1,000 ft³ | 7,480.5195 gal (US) |
How to Convert Cubic Foot to US Gallon Manually
Step by StepConverting cubic feet to US gallons is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in cubic feetStart with the number of cubic feet (ft³) you want to convert.
- 2Multiply by 7.48052The conversion factor from ft³ to gal (US) is 7.48052. Multiply your value by this number.
- 3Read the result in US gallonsThe result is your value in US gallons (gal (US)).
Formula
Multiply the value in cubic feet by 7.48052. For the reverse direction, multiply by 0.133681.
gal (US) = ft³ × 7.48052ft³ = gal (US) × 0.133681Tips
Use these in everyday conversions- 1 ft³ = 28.317 L = 0.0283 m³.
- CFM to m³/h: multiply CFM by 1.699.
- 1 m³ ≈ 35.3 ft³.
Common Mistakes
Avoid these- Confusing ft³ with ft² in US real-estate contexts.
- Using 28 L instead of 28.32 L in precision HVAC calculations.
- Mixing CCF (100 cubic feet) with CFM (cubic feet per minute) on utility bills.
About Cubic Foot and US Gallon
What is the Cubic Foot?
The cubic foot equals approximately 28.317 liters (or exactly 1,728 cubic inches) and is the American standard volume unit for HVAC capacity, natural-gas billing, refrigerator interior volume, and bulk material like concrete or mulch. American gas utilities measure delivered gas in 'CCF' (hundred cubic feet) or 'MCF' (thousand cubic feet), even when the customer thinks in terms of monthly bills. Refrigerators are advertised by their interior cubic-foot capacity (typical home unit: 18–25 ft³). Air-conditioning systems are rated in CFM (cubic feet per minute) airflow. Concrete is sometimes priced by the cubic yard (27 ft³), and mulch and topsoil are often sold by cubic foot bags. The cubic foot relates to the cubic yard (27 ft³ = 1 yd³), the cubic inch (1,728 in³ = 1 ft³), the cubic meter (1 ft³ ≈ 0.0283 m³), and the gallon (1 ft³ ≈ 7.481 US gal).
- US air-conditioning and ventilation flow (CFM)
- US natural gas consumption
- Refrigerator and freezer capacity in the US
A typical US fridge is 20 cu ft (566 L). US HVAC flow rated in CFM. US residential gas billed per 100 cu ft (CCF).
What is the US Gallon?
The US liquid gallon equals exactly 3.785411784 liters and is the standard volume unit for fuel, beverages, milk, and household liquids in the United States. Defined as 231 cubic inches, the US gallon descends from the English wine gallon of 1707, which Britain replaced with the larger imperial gallon in 1824 — a divergence that left the United States with a different gallon than the rest of the English-speaking world. American gas stations price gasoline by the gallon (typical fill-up: 12–15 gallons), milk is sold in half-gallons and gallons, and many beverages come in fluid-ounce subdivisions of the gallon. The US gallon relates to the liter (1 gal ≈ 3.785 L), the quart (4 qt = 1 gal), the pint (8 pt = 1 gal), the cup (16 cups = 1 gal), and the imperial gallon (1 imp gal ≈ 1.201 US gal — about 20% larger).
- US fuel pricing and consumption
- US paint, oil and cleaning-product packaging
- US beverage containers (1-gallon jugs of milk)
US car tank ≈ 15 gallons (57 L). 1 US gallon of milk is a common grocery size (3.79 L). US paint often sold by the gallon.