Convert US Gallon to Cubic Foot (gal (US) → ft³)
The US gallon is the standard unit for fuel, milk, and beverages across the United States.
US Gallon to Cubic Foot Conversion Table
10 common values| US Gallon | Cubic Foot |
|---|---|
| 1 gal (US) | 0.133681 ft³ |
| 2 gal (US) | 0.267361 ft³ |
| 5 gal (US) | 0.668403 ft³ |
| 10 gal (US) | 1.336806 ft³ |
| 20 gal (US) | 2.673611 ft³ |
| 50 gal (US) | 6.684028 ft³ |
| 100 gal (US) | 13.368056 ft³ |
| 200 gal (US) | 26.736111 ft³ |
| 500 gal (US) | 66.840278 ft³ |
| 1,000 gal (US) | 133.68056 ft³ |
How to Convert US Gallon to Cubic Foot Manually
Step by StepConverting US gallons to cubic feet is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in US gallonsStart with the number of US gallons (gal (US)) you want to convert.
- 2Multiply by 0.133681The conversion factor from gal (US) to ft³ is 0.133681. Multiply your value by this number.
- 3Read the result in cubic feetThe result is your value in cubic feet (ft³).
Formula
Multiply the value in US gallons by 0.133681. For the reverse direction, multiply by 7.48052.
ft³ = gal (US) × 0.133681gal (US) = ft³ × 7.48052Tips
Use these in everyday conversions- 1 US gallon = 3.785 L = 128 US fluid ounces = 4 quarts.
- Converting mpg (US) to L/100 km: 235.215 / mpg = L/100 km.
- The US gallon is based on the old English Queen Anne wine gallon (1707).
Common Mistakes
Avoid these- Using UK gallons on a US fuel-economy figure — 30 mpg (US) = 36 mpg (UK).
- Confusing US gallon (3.79 L) with UK gallon (4.55 L) — 20% difference.
- Using "gallon" without qualifier in cross-Atlantic commerce.
About US Gallon and Cubic Foot
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.
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).