Skip to content

Cubic Inches to Gallons Converter

Convert cubic inches to US gallons and gallons to cubic inches instantly. Bidirectional volume converter with formula and common values.

in³

Gallons

1

gal

231 in³ = 1 gal

gal = in³ × 0.004329

Cubic Inches to Gallons: 1 in³ equals 0.004329 gal. To convert cubic inches to gallons, multiply by 0.004329 (gal = in³ × 0.004329). For example, 10 in³ = 0.04329 gal.

How to Convert Cubic Inches to Gallons

To convert from cubic inches to gallons, multiply the value by 0.004329. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Cubic Inches to Gallons: gal = in³ × 0.004329
  • Gallons to Cubic Inches: in³ = gal ÷ 0.004329

Cubic Inches to Gallons Conversion Chart

Cubic Inches (in³)Gallons (gal)
0.10.000433
0.250.001082
0.50.002165
10.004329
20.008658
30.012987
50.021645
100.04329
200.08658
250.108225
500.21645
1000.4329
2501.08225
10004.329

Understanding the Units

What is a Gallon?

The US liquid gallon equals exactly 3.785411784 liters; the imperial (UK) gallon equals 4.54609 liters.

From the Old Northern French galun, originally a wine measure.

Common contexts: fuel, milk, paint.

Real-World Reference Points

Item Cubic Inches (in³) Gallons (gal)
A milk jug (US)231.00021
Average car gas tank (US)3234.003214

Related

Gallons to Liters Converter

Convert US gallons to liters and liters to gallons instantly with formula and common values.

Cups to Milliliters Converter

Convert cups to milliliters and milliliters to cups. US customary cup conversion.

Fluid Ounces to Milliliters Converter

Convert fluid ounces to milliliters and milliliters to fluid ounces instantly.

Pints to Liters Converter

Convert US pints to liters and liters to pints with formula and examples.

Tablespoons to Milliliters Converter

Convert tablespoons to milliliters and milliliters to tablespoons instantly.

Liters to Gallons Converter

Convert liters to US gallons and gallons to liters instantly.

FAQ

How many gallons are in a cubic inch?

One cubic inch equals approximately 0.004329 US gallons.

How many cubic inches in a gallon?

One US gallon equals exactly 231 cubic inches.

How do I convert cubic inches to gallons?

Divide the number of cubic inches by 231. For example, 231 in³ ÷ 231 = 1 gallon.

Why is a gallon 231 cubic inches?

The US gallon is historically defined as the volume of a cylinder 7 inches in diameter and 6 inches tall, which gives approximately 231 cubic inches.

How many gallons are in 1 cubic inch?

1 in³ equals 0.004329 gal.

How do you convert cubic inches to gallons?

Multiply the cubic inch value by 0.004329. Formula: gal = in³ × 0.004329.

How many gallons are in 5 cubic inches?

5 in³ = 0.021645 gal.

How do you convert gallons back to cubic inches?

Use the inverse formula: in³ = gal ÷ 0.004329. For example, 1 gal = 231.000231 in³.