Cubic Inches to Gallon (US) Converter
Volume · unit-converter
Convert Cubic Inches to Gallon (US) with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use liter-based factors (US fluid measures, imperial UK units, SI cubic meters).
Calculator
From: Cubic Inches (in3)
To: Gallon (US) (gal)
About Cubic Inches
The cubic inch is the volume of a cube one inch on a side. Engine displacement in the US and small volumes in machining use cubic inches.
About Gallon (US)
The US liquid gallon is defined as 231 cubic inches (about 3.78541 liters). US recipes, fuel economy, and retail liquids typically use US gallons.
How to convert cubic inches to gallons (us)
1 cubic inches is equal to 0.00432900433358 gallon (us):
1 in3 = (0.016387064 L ÷ 3.78541178 L) gal = 0.00432900433358 gal
Each cubic inches is defined as 0.016387064 L and each gallon (us) as 3.78541178 L, so one in3 equals 0.016387064 ÷ 3.78541178 gal = 0.00432900433358 gal.
Let V(in3) be the numeric value of the same volume measured in Cubic Inches (in3), and V(gal) the value in Gallon (US) (gal). Then:
V(gal) = V(in3) × (0.016387064 / 3.78541178)
Equivalently, divide by how many in3 fit into one gal (liters per gal divided by liters per in3):
V(gal) = V(in3) ÷ 230.99999975590504
Or: gallon (us) = cubic inches ÷ 230.99999975590504
Examples
Example #1: Convert 20 in3 to gallon (us)
20 in3 = 20 in3 × (0.016387064/3.78541178) gal = 0.0865800867 gal
20 in3 = 20 in3 ÷ 230.99999975590504 = 0.0865800867 gal
Example #2: Convert 50 in3 to gallon (us)
50 in3 = 50 in3 × (0.016387064/3.78541178) gal = 0.2164502167 gal
50 in3 = 50 in3 ÷ 230.99999975590504 = 0.2164502167 gal
Summary
To convert Cubic Inches to Gallon (US), multiply the value in in3 by the ratio of liters per in3 divided by liters per gal. Equivalently: value_gal = value_in3 × (0.016387064 / 3.78541178). Numerically, 1 in3 equals 0.004329004333578737 gal.
Relationship context
Both units are US customary fluid / volume in this tool’s grouping. Conversions use fixed liter equivalents, so factors are consistent for cooking, engineering, and cross-checking labels. The factor from Cubic Inches to Gallon (US) is 4.329004e-3 (1 in3 = 0.004329004333578737 gal).
Conversion tables
| Cubic Inches (in3) | Gallon (US) (gal) |
|---|---|
| 0.1 | 0.0004329004 |
| 1 | 0.0043290043 |
| 2 | 0.0086580087 |
| 3 | 0.012987013 |
| 4 | 0.0173160173 |
| 5 | 0.0216450217 |
| 6 | 0.025974026 |
| 7 | 0.0303030303 |
| 8 | 0.0346320347 |
| 9 | 0.038961039 |
| Cubic Inches (in3) | Gallon (US) (gal) |
|---|---|
| 10 | 0.0432900433 |
| 20 | 0.0865800867 |
| 30 | 0.12987013 |
| 40 | 0.1731601733 |
| 50 | 0.2164502167 |
| 60 | 0.25974026 |
| 70 | 0.3030303034 |
| 80 | 0.3463203467 |
| 90 | 0.38961039 |
| 100 | 0.4329004334 |
Conversions outside the hub list
The grid on the category page lists hub units only. These pairs include at least one unit outside that hub set (same tools: formulas and tables on each page).
- cubic-inch to uk-gallonCubic Inches to Gallon (UK)
- cubic-inch to uk-quartCubic Inches to Quart (UK)
- cubic-inch to uk-pintCubic Inches to Pint (UK)
- cubic-inch to us-quartCubic Inches to Quart (US)
- cubic-inch to us-pintCubic Inches to Pint (US)
- cubic-inch to uk-cupCubic Inches to Cup (UK)
- cubic-inch to us-cupCubic Inches to Cup (US)
- cubic-inch to uk-fluid-ounceCubic Inches to Fluid Ounce (UK)
- cubic-inch to uk-tablespoonCubic Inches to Tablespoon (UK)
- cubic-inch to uk-teaspoonCubic Inches to Teaspoon (UK)
- uk-gallon to us-gallonGallon (UK) to Gallon (US)
- uk-quart to us-gallonQuart (UK) to Gallon (US)