Cubic Inches to US Gallons Converter
Convert cubic inches to US liquid gallons (and back) instantly with common volume reference points.
Volume Converter
1 US gal = 231 in³ (exact)
Common Reference Points
| Volume | in³ | US gal |
|---|
Conversion Formula
in³ → gal
gal = in³ ÷ 231
gal → in³
in³ = gal × 231
The factor 231 is the exact legal definition of the US liquid gallon (NIST Handbook 44).
Summary
Convert cubic inches to US liquid gallons (and back) instantly with common volume reference points.
How it works
- Enter a value in cubic inches or US gallons.
- The converter applies the exact factor: 1 US gal = 231 in³.
- The opposite field updates instantly as you type.
- Reference cards below the converter show common volume benchmarks.
- Click "Swap" to reverse the direction of conversion.
Use cases
- Calculate fuel tank capacity from engine displacement specs.
- Convert aquarium or reservoir volume for water treatment.
- Verify industrial container volumes during manufacturing.
- Cross-check automotive or marine engine specs in different units.
- Convert recipe or storage volumes between unit systems.
Frequently Asked Questions
Last updated: 2026-06-09 ·
Reviewed by Nham Vu