A US liquid gallon is exactly 3.785411784 liters.
Gallons to Quarts Converter — gal to qt
Convert Gallon (gal) to Quart (qt) using the exact conversion factor (1 gallon = 4 quart). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Gallons to Quarts converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
A US liquid quart is one quarter of a US gallon.
Result = input x 0.003785411784 / 0.000946352946.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gallons to Quarts
Gallon and Quart appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Gallon is typically associated with united States (fuel, beverage, and liquid measurement), while Quart is typically associated with united States (cooking, dairy, motor oil packaging).
Formula
quarts = gallons × 4
This factor comes from each unit's defined relationship to the category's base unit: 1 gallon equals 0.003785411784 base units, and 1 quart equals 0.000946352946 base units, so dividing one by the other gives the direct gallon-to-quart factor of 4.
Simple example
1 gal × 4 = 4 qt
1 gallon = 4 quarts.
Real-world example
10 gal × 4 = 40 qt
10 gallons = 40 quarts.
Conversion table
| Gallon (gal) | Quart (qt) |
|---|---|
| 1 gal | 4 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 25 gal | 100 qt |
| 50 gal | 200 qt |
| 100 gal | 400 qt |
Reverse conversion: Quart to Gallon
4 qt × 0.25 = 1 gal
4 quarts = 1 gallon.
gallons = quarts × 0.25
For a page dedicated to this direction, see Quart to Gallon.
Gallon vs. Quart
| Aspect | Gallon | Quart |
|---|---|---|
| Family | US customary unit | US customary unit |
| Typical use | Fuel pump and vehicle fuel-economy measurement in the US | US recipe measurement (larger liquid volumes) |
| Where it's used | United States (fuel, beverage, and liquid measurement) | United States (cooking, dairy, motor oil packaging) |
Understanding the Gallon
Gallon (gal) measures volume. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is classified as a US customary unit.
Where it's used: United States (fuel, beverage, and liquid measurement)
US gallon vs. imperial gallon. The US liquid gallon (3.785411784 L) and the British imperial gallon (4.54609 L) are different units with the same name; always confirm which one a source is using.
Uses of the Gallon today
- Fuel pump and vehicle fuel-economy measurement in the US
- Beverage and liquid product packaging in the US
- Cooking and recipe measurement in US customary units
History of the Gallon
The US gallon descends from the English wine gallon of 231 cubic inches, a standard used for measuring wine in medieval and early modern England, which the American colonies inherited and retained even after England moved to a different imperial gallon in 1824.
England's 1824 Weights and Measures Act replaced the old wine gallon with a new imperial gallon (based on 10 pounds of water), but the US kept the older 231-cubic-inch definition — which is why the US gallon (3.785 L) and the imperial gallon (4.546 L) differ by about 20% today.
Historical origin. Gallon was not the invention of a single named person; it developed through the process described above.
Understanding the Quart
Quart (qt) measures volume. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. It is classified as a US customary unit.
Where it's used: United States (cooking, dairy, motor oil packaging)
Uses of the Quart today
- US recipe measurement (larger liquid volumes)
- US motor oil and automotive fluid packaging
- US dairy and beverage packaging (quart containers)
History of the Quart
The quart ('quarter' of a gallon) follows the same English wine-gallon lineage as the US gallon, retained by the US after England moved to a different imperial standard in 1824.
Historical origin. Quart was not the invention of a single named person; it developed through the process described above.
Gallon — sources
- NIST Handbook 44, Appendix C — General tables of units of measurement, including the US gallon definition.
Quart — sources
- NIST Handbook 44, Appendix C — General tables of units including the US quart definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many quarts are in 1 gallon?
1 gallon equals 4 quarts, using the exact defined conversion factor rather than an estimate.
How do I convert gallon to quart?
Multiply the gallon value by 4. The converter above does this instantly to whatever precision you set.
How do I convert quart back to gallon?
Use the reverse factor: 1 quart equals 0.25 gallons. You can also use the swap control in the converter above to flip the direction instantly.
What is a gallon?
Gallon (gal) measures volume. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is classified as a US customary unit.
What is a quart?
Quart (qt) measures volume. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. It is classified as a US customary unit.
Is the gallon to quart conversion exact?
Yes. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between us gallon vs. imperial gallon?
The US liquid gallon (3.785411784 L) and the British imperial gallon (4.54609 L) are different units with the same name; always confirm which one a source is using.
Where is the gallon still used today?
United States (fuel, beverage, and liquid measurement)