Gallons to Cubic Inches Converter
Unit ConversionConvert gallons to cubic inches. 1 gallon equals exactly 231 cubic inches, with a conversion table, worked examples and the reverse conversion.
Cubic Inches
Equivalent volume in cubic inches
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SponsoredThis converter turns gallons into cubic inches (gallons to in3). Enter a value and the result updates as you type. 1 gallon equals exactly 231 cubic inches.
Multiplying US gallons by 231 gives cubic inches, the unit for designing a tank, a reservoir or a box that must hold a set number of gallons. Because the US gallon is defined as 231 cubic inches, the answer is exact with no rounding.
The result is rounded to 2 decimal places, but the factor behind it never is, so long chains of conversions stay accurate. Type a whole number or a decimal; the conversion table below lists common values.
How to Convert Gallons to Cubic Inches
To convert gallons to cubic inches, multiply by 231. For example, 7.5 gallons equals exactly 1,732.5 cubic inches.
To go from cubic inches back to gallons, divide by 231. For example, 2,400 cubic inches is about 10.3896 gallons.
Gallons to Cubic Inches Conversion Table
Common values in gallons converted to cubic inches, rounded to 2 decimal places.
| Gallons | Cubic Inches |
|---|---|
| 0.25 gal | 57.75 in³ |
| 0.5 gal | 115.5 in³ |
| 1 gal | 231 in³ |
| 2 gal | 462 in³ |
| 2.5 gal | 577.5 in³ |
| 5 gal | 1,155 in³ |
| 10 gal | 2,310 in³ |
| 15 gal | 3,465 in³ |
| 20 gal | 4,620 in³ |
| 30 gal | 6,930 in³ |
| 55 gal | 12,705 in³ |
| 100 gal | 23,100 in³ |
Designing a Tank That Holds a Set Number of Gallons
A 10 gallon tank needs 2,310 cubic inches inside. A box 20 inches long and 10 inches wide reaches that at about 11.55 inches of water depth, so a 12 inch tall tank holds 10 gallons with a little room to spare. Measure the inside, since glass or wall thickness takes up space.
The Aquarium Water Volume Calculator checks a planned tank against its gallons, and the Turtle Tank Calculator suggests a tank size for a turtle.
Frequently Asked Questions
How many cubic inches is 7 gallons?
1,617 cubic inches.
How many cubic inches is 35 gallons?
8,085 cubic inches.
How many cubic inches is 40 gallons?
9,240 cubic inches.
How many cubic inches is 60 gallons?
13,860 cubic inches.
How many cubic inches is 75 gallons?
17,325 cubic inches.
What happens if I enter a negative number?
The result shows a dash. A volume is an amount of space, so it is never below zero; a minus sign in front of a value is usually a typing slip.
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