A US liquid gallon is exactly 3.785411784 liters.
Gallons to Imperial quarts Converter — gal to imp qt
Convert Gallon (gal) to Imperial quart (imp qt) using the exact conversion factor (1 gallon = 3.330696739 imperial quart). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Gallons to Imperial 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.
An imperial quart is one quarter of an imperial gallon.
Result = input x 0.003785411784 / 0.0011365225.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gallons to Imperial quarts
Gallon and Imperial 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 Imperial quart is typically associated with united Kingdom and Commonwealth countries (historically).
Formula
imperial quarts = gallons × 3.33069673852
This factor comes from each unit's defined relationship to the category's base unit: 1 gallon equals 0.003785411784 base units, and 1 imperial quart equals 0.0011365225 base units, so dividing one by the other gives the direct gallon-to-imperial quart factor of 3.33069673852.
Simple example
1 gal × 3.330696739 = 3.330696739 imp qt
1 gallon = 3.330696739 imperial quarts.
Real-world example
10 gal × 3.330696739 = 33.30696739 imp qt
10 gallons = 33.30696739 imperial quarts.
Conversion table
| Gallon (gal) | Imperial quart (imp qt) |
|---|---|
| 1 gal | 3.330696739 imp qt |
| 5 gal | 16.65348369 imp qt |
| 10 gal | 33.30696739 imp qt |
| 25 gal | 83.26741846 imp qt |
| 50 gal | 166.5348369 imp qt |
| 100 gal | 333.0696739 imp qt |
Reverse conversion: Imperial quart to Gallon
3.330696739 imp qt × 0.3002374814 = 1 gal
3.330696739 imperial quarts = 1 gallons.
gallons = imperial quarts × 0.300237481376
For a page dedicated to this direction, see Imperial quart to Gallon.
Gallon vs. Imperial quart
| Aspect | Gallon | Imperial quart |
|---|---|---|
| Family | US customary unit | UK/imperial customary unit |
| Typical use | Fuel pump and vehicle fuel-economy measurement in the US | UK/Commonwealth liquid measurement in historical or specialized contexts |
| Where it's used | United States (fuel, beverage, and liquid measurement) | United Kingdom and Commonwealth countries (historically) |
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 Imperial quart
Imperial quart (imp qt) measures volume. The imperial quart is one-quarter of an imperial gallon: exactly 1.1365225 liters. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom and Commonwealth countries (historically)
Imperial quart vs. US quart. Like the gallon and pint, the imperial quart is about 20% larger than the US quart, following from Britain's 1824 gallon redefinition.
Uses of the Imperial quart today
- UK/Commonwealth liquid measurement in historical or specialized contexts
History of the Imperial quart
The imperial quart follows directly from the 1824 imperial gallon as one-quarter of it, part of the same UK standardization that diverged from the US gallon system.
Historical origin. Imperial 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.
Imperial quart — sources
- UK Weights and Measures Act 1824 — Basis for the imperial quart via the imperial gallon.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial quarts are in 1 gallon?
1 gallon equals 3.330696739 imperial quarts, using the exact defined conversion factor rather than an estimate.
How do I convert gallon to imperial quart?
Multiply the gallon value by 3.330696739. The converter above does this instantly to whatever precision you set.
How do I convert imperial quart back to gallon?
Use the reverse factor: 1 imperial quart equals 0.3002374814 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 imperial quart?
Imperial quart (imp qt) measures volume. The imperial quart is one-quarter of an imperial gallon: exactly 1.1365225 liters. It is classified as a UK/imperial customary unit.
Is the gallon to imperial quart conversion exact?
Yes. The imperial quart is one-quarter of an imperial gallon: exactly 1.1365225 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)