US Gallon to US Quart Converter
Converts us gallon (gal) to us quart (qt) and back. The conversion factor is shown below every result.
How to Convert US Gallon to US Quart
What Is an US Gallon?
The US gallon (gal) is a US customary unit of volume defined as exactly 231 cubic inches (3.785411784 L).
What Is an US Quart?
The US liquid quart (qt) is a US customary unit of volume equal to exactly 1/4 of a US gallon.
Common US Gallon to US Quart Reference Points
Real-world reference values for quick sanity checks.
| Item | US Gallon (gal) | US Quart (approx.) |
|---|---|---|
| A standard car engine oil fill (approx.) | 5 gal | 20 qt |
| A 5-gallon paint bucket | 5 gal | 20 qt |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
US Gallon to US Quart Conversion Table
| US Gallon (gal) | US Quart (qt) |
|---|---|
| 0.5 gal | 2 qt |
| 1 gal | 4 qt |
| 2 gal | 8 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 20 gal | 80 qt |
| Source: NIST SP 811, Appendix B (1 US gallon = 4 US quarts exactly) | |
Frequently Asked Questions
How do I convert gallons to quarts?
Multiply the gallon value by 4. For example, 2.5 gal × 4 = 10 qt.
Why is the gallon-to-quart factor exactly 4?
The US quart is defined as exactly 1/4 of a US gallon, so the relationship is a clean, exact whole number unlike many of this site's other volume conversions.
Is this the US gallon or the UK imperial gallon?
This page uses the US gallon (3.785411784 L). The UK imperial gallon is larger (about 4.54609 L) and also splits into 4 quarts, but those UK quarts are a different, larger size than US quarts.
Related Volume Converters
A good measuring tool marked in both gal and qt removes the guesswork at the point of use.