Gallons to Cubic Inches Calculator
Convert US gallons (gal) to cubic inches (in³) accurately. Uses the exact legal US definition: 1 gallon = 231 cubic inches.
Volume ConverterLive
Precision:
gal
—
Formula
n gal × 231 = ? in³Quick Values
How to Convert US Gallons to Cubic Inches
in³ = gal × 231 (1 US gallon = 231 in³ exactly)→1 US gallon = exactly 231 cubic inches — the US legal definition since 1836.
→A 5-gallon bucket = 1,155 cubic inches of volume.
→Note: 1 Imperial (UK) gallon = 277.42 in³, not 231.
→To reverse: divide cubic inches by 231.
US Gallons → Cubic Inches Reference Table
| US Gallons (gal) | Cubic Inches (in³) |
|---|---|
| 1 | 231 |
| 2 | 462 |
| 5 | 1,155 |
| 10 | 2,310 |
| 25 | 5,775 |
| 50 | 11,550 |
| 100 | 23,100 |
| 250 | 57,750 |
| 500 | 115,500 |
| 1,000 | 231,000 |
Click any row to load into the calculator.
📦Unit Reference
US Gallons
1 gal = 231 in³
Cubic Inches
1 in³ = 0.0043 gal
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