Convert cubic feet to US gallons

1 ft³=7.48052gal (US)

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

You have

Equals

7.480519

Conversion formula

Forward

US gallons = cubic feet × 7.48052

Reverse

cubic feet = US gallons × 0.1337

Example: 10 ft³ × 7.48052 = 74.8052 gal (US).

About both units

From

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

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 to US Gallon conversion table

Common cubic feet to US gallons values for quick reference.

Cubic Foot (ft³)	US Gallon (gal (US))
1 ft³	7.48052 gal (US)
2 ft³	14.961 gal (US)
5 ft³	37.4026 gal (US)
10 ft³	74.8052 gal (US)
20 ft³	149.61 gal (US)
50 ft³	374.026 gal (US)
100 ft³	748.052 gal (US)
200 ft³	1,496.1 gal (US)
500 ft³	3,740.26 gal (US)
1,000 ft³	7,480.52 gal (US)

Tips & common mistakes

Quick tips

1 ft³ = 28.317 L = 0.0283 m³.
CFM to m³/h: multiply CFM by 1.699.
1 m³ ≈ 35.3 ft³.

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.

Frequently asked questions

How many US gallons in a cubic foot?

One cubic foot equals 7.48052 US gallons.

How do I convert cubic feet to US gallons?

Multiply the cubic foot value by 7.48052 to get the equivalent in US gallons.

What is 100 cubic feet in US gallons?

100 cubic feet equals 748.052 US gallons.

Is a cubic foot bigger than a us gallon?

Yes. 1 cubic foot equals 7.48052 US gallons, so one cubic foot is larger.

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

Multiply by 7.48 for a quick estimate; use a calculator for precise results.

Related volume conversions

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