Convert US gallons to cubic inches

1 gal (US)=231in³

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

You have

Equals

231

Conversion formula

Forward

cubic inches = US gallons × 231

Reverse

US gallons = cubic inches × 0.004329

Example: 10 gal (US) × 231 = 2,310 in³.

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 Inch

in³

The cubic inch equals 16.387 cubic centimetres. Used in US automotive engineering for engine displacement (e.g., "350 cubic inch V8 = 5.7 L") and in firearms (bullet cartridges). Most of the rest of the world uses cc or litres.

Real-world: 350 cu in V8 = 5.7 L engine. 302 cu in Ford V8 = 4.9 L. Modern specs typically give litres.

Read full cubic inch reference →

US Gallon to Cubic Inch conversion table

Common US gallons to cubic inches values for quick reference.

US Gallon (gal (US))	Cubic Inch (in³)
1 gal (US)	231 in³
2 gal (US)	462 in³
5 gal (US)	1,155 in³
10 gal (US)	2,310 in³
20 gal (US)	4,620 in³
50 gal (US)	11,550 in³
100 gal (US)	23,100 in³
200 gal (US)	46,200 in³
500 gal (US)	115,500 in³
1,000 gal (US)	231,000 in³

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 inches in a us gallon?

One us gallon equals 231 cubic inches.

How do I convert US gallons to cubic inches?

Multiply the us gallon value by 231 to get the equivalent in cubic inches.

What is 100 US gallons in cubic inches?

100 US gallons equals 23,100 cubic inches.

Is a us gallon bigger than a cubic inch?

Yes. 1 us gallon equals 231 cubic inches, so one us gallon is larger.

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

Multiply by 231 for a quick estimate; use a calculator for precise results.

Related volume conversions

📊 See full comparison matrix →

Conversions in other categories

WeightKilogram → Pound LengthKilometer → Mile TemperatureCelsius → Fahrenheit AreaSquare Meter → Square Foot SpeedKilometer per Hour → Mile per Hour EnergyKilojoule → Kilocalorie PressureBar → Pound per Square Inch PowerKilowatt → Mechanical Horsepower