An imperial gallon is exactly 4.54609 liters.
Imperial gallons to Imperial quarts Converter — imp gal to imp qt
Convert Imperial gallon (imp gal) to Imperial quart (imp qt) using the exact conversion factor (1 imperial gallon = 4 imperial quart). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial 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 0.00454609 / 0.0011365225.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial gallons to Imperial quarts
Imperial 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. Imperial gallon is typically associated with united Kingdom, Canada (some contexts), and other Commonwealth countries, while Imperial quart is typically associated with united Kingdom and Commonwealth countries (historically).
Formula
imperial quarts = imperial gallons × 4
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial gallon equals 0.00454609 base units, and 1 imperial quart equals 0.0011365225 base units, so dividing one by the other gives the direct imperial gallon-to-imperial quart factor of 4.
Simple example
1 imp gal × 4 = 4 imp qt
1 imperial gallon = 4 imperial quarts.
Real-world example
10 imp gal × 4 = 40 imp qt
10 imperial gallons = 40 imperial quarts.
Conversion table
| Imperial gallon (imp gal) | Imperial quart (imp qt) |
|---|---|
| 1 imp gal | 4 imp qt |
| 5 imp gal | 20 imp qt |
| 10 imp gal | 40 imp qt |
| 25 imp gal | 100 imp qt |
| 50 imp gal | 200 imp qt |
| 100 imp gal | 400 imp qt |
Reverse conversion: Imperial quart to Imperial gallon
4 imp qt × 0.25 = 1 imp gal
4 imperial quarts = 1 imperial gallon.
imperial gallons = imperial quarts × 0.25
For a page dedicated to this direction, see Imperial quart to Imperial gallon.
Imperial gallon vs. Imperial quart
| Aspect | Imperial gallon | Imperial quart |
|---|---|---|
| Family | UK/imperial customary unit | UK/imperial customary unit |
| Typical use | UK fuel and beverage measurement (historically; UK now primarily uses liters for retail) | UK/Commonwealth liquid measurement in historical or specialized contexts |
| Where it's used | United Kingdom, Canada (some contexts), and other Commonwealth countries | United Kingdom and Commonwealth countries (historically) |
Understanding the Imperial gallon
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom, Canada (some contexts), and other Commonwealth countries
Imperial gallon vs. US gallon. Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Uses of the Imperial gallon today
- UK fuel and beverage measurement (historically; UK now primarily uses liters for retail)
- Commonwealth country liquid measurement in some contexts
History of the Imperial gallon
The imperial gallon was created by Britain's Weights and Measures Act of 1824, defined as the volume of 10 pounds of water, replacing several inconsistent older English gallon definitions (wine gallon, ale gallon, corn gallon) with one standard.
Historical origin. Imperial 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.
Imperial gallon — sources
- UK Weights and Measures Act 1824 — Establishes the imperial 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 imperial gallon?
1 imperial gallon equals 4 imperial quarts, using the exact defined conversion factor rather than an estimate.
How do I convert imperial gallon to imperial quart?
Multiply the imperial gallon value by 4. The converter above does this instantly to whatever precision you set.
How do I convert imperial quart back to imperial gallon?
Use the reverse factor: 1 imperial quart equals 0.25 imperial gallons. You can also use the swap control in the converter above to flip the direction instantly.
What is a imperial gallon?
Imperial gallon (imp gal) measures volume. The imperial gallon is defined as exactly 4.54609 liters, about 20% larger than the US gallon. It is classified as a UK/imperial 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 imperial 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 imperial gallon vs. us gallon?
Britain's 1824 Weights and Measures Act defined a new gallon based on 10 pounds of water, replacing the old wine gallon the US had already adopted — leaving the US (3.785 L) and imperial (4.546 L) gallons about 20% apart today.
Where is the imperial gallon still used today?
United Kingdom, Canada (some contexts), and other Commonwealth countries