An imperial quart is one quarter of an imperial gallon.
Imperial quarts to Gallons Converter — imp qt to gal
Convert Imperial quart (imp qt) to Gallon (gal) using the exact conversion factor (1 imperial quart = 0.3002374814 gallon). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial quarts to Gallons 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 gallon is exactly 3.785411784 liters.
Result = input x 0.0011365225 / 0.003785411784.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial quarts to Gallons
Imperial quart and Gallon 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. Imperial quart is typically associated with united Kingdom and Commonwealth countries (historically), while Gallon is typically associated with united States (fuel, beverage, and liquid measurement).
Formula
gallons = imperial quarts × 0.300237481376
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial quart equals 0.0011365225 base units, and 1 gallon equals 0.003785411784 base units, so dividing one by the other gives the direct imperial quart-to-gallon factor of 0.300237481376.
Simple example
1 imp qt × 0.3002374814 = 0.3002374814 gal
1 imperial quart = 0.3002374814 gallons.
Real-world example
10 imp qt × 0.3002374814 = 3.002374814 gal
10 imperial quarts = 3.002374814 gallons.
Conversion table
| Imperial quart (imp qt) | Gallon (gal) |
|---|---|
| 1 imp qt | 0.3002374814 gal |
| 5 imp qt | 1.501187407 gal |
| 10 imp qt | 3.002374814 gal |
| 25 imp qt | 7.505937034 gal |
| 50 imp qt | 15.01187407 gal |
| 100 imp qt | 30.02374814 gal |
Reverse conversion: Gallon to Imperial quart
0.3002374814 gal × 3.330696739 = 1 imp qt
0.3002374814 gallons = 1 imperial quarts.
imperial quarts = gallons × 3.33069673852
For a page dedicated to this direction, see Gallon to Imperial quart.
Imperial quart vs. Gallon
| Aspect | Imperial quart | Gallon |
|---|---|---|
| Family | UK/imperial customary unit | US customary unit |
| Typical use | UK/Commonwealth liquid measurement in historical or specialized contexts | Fuel pump and vehicle fuel-economy measurement in the US |
| Where it's used | United Kingdom and Commonwealth countries (historically) | United States (fuel, beverage, and liquid measurement) |
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.
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.
Imperial quart — sources
- UK Weights and Measures Act 1824 — Basis for the imperial quart via the imperial gallon.
Gallon — sources
- NIST Handbook 44, Appendix C — General tables of units of measurement, including the US gallon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gallons are in 1 imperial quart?
1 imperial quart equals 0.3002374814 gallons, using the exact defined conversion factor rather than an estimate.
How do I convert imperial quart to gallon?
Multiply the imperial quart value by 0.3002374814. The converter above does this instantly to whatever precision you set.
How do I convert gallon back to imperial quart?
Use the reverse factor: 1 gallon equals 3.330696739 imperial quarts. You can also use the swap control in the converter above to flip the direction instantly.
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.
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.
Is the imperial quart to gallon conversion exact?
Yes. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 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 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.
Where is the imperial quart still used today?
United Kingdom and Commonwealth countries (historically)