Convert US gallons to cubic feet

1 gal (US)=0.1337ft³

Use the converter below to change any US gallons value into cubic feet instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.13368

Conversion formula

Forward

cubic feet = US gallons × 0.1337

Reverse

US gallons = cubic feet × 7.48052

Example: 10 gal (US) × 0.1337 = 1.33681 ft³.

About both units

From

US Gallon

gal (US)

The US gallon equals 3.785411784 litres exactly. It is the standard fuel and liquid volume unit in the United States. A typical American car holds 14–18 US gallons of fuel. US fuel economy is quoted in miles per US gallon (mpg).

Real-world: 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.

Read full us gallon reference →

Cubic Foot

ft³

The cubic foot equals 28.317 litres exactly. It is used in US HVAC and ventilation (CFM — cubic feet per minute), US natural gas billing, and appliance capacity (refrigerators, freezers). One cubic foot is roughly the volume of a standard shoebox times six.

Real-world: 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).

Read full cubic foot reference →

US Gallon to Cubic Foot conversion table

Common US gallons to cubic feet values for quick reference.

US Gallon (gal (US))	Cubic Foot (ft³)
1 gal (US)	0.1337 ft³
2 gal (US)	0.2674 ft³
5 gal (US)	0.6684 ft³
10 gal (US)	1.33681 ft³
20 gal (US)	2.67361 ft³
50 gal (US)	6.68403 ft³
100 gal (US)	13.3681 ft³
200 gal (US)	26.7361 ft³
500 gal (US)	66.8403 ft³
1,000 gal (US)	133.681 ft³

Tips & common mistakes

Quick tips

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).

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.

Frequently asked questions

How many cubic feet in a us gallon?

One us gallon equals 0.1337 cubic feet.

How do I convert US gallons to cubic feet?

Multiply the us gallon value by 0.1337 to get the equivalent in cubic feet.

What is 100 US gallons in cubic feet?

100 US gallons equals 13.3681 cubic feet.

Is a us gallon bigger than a cubic foot?

No. 1 us gallon equals 0.1337 cubic feet, so one us gallon is smaller.

How to convert US gallons to cubic feet without a calculator?

Multiply by 0.13 for a quick estimate; use a calculator for precise results.

Related volume conversions

📊 See full comparison matrix →

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