An imperial fluid ounce is 1/160 of an imperial gallon.
Imperial fluid ounces to Imperial quarts Converter — imp fl oz to imp qt
Convert Imperial fluid ounce (imp fl oz) to Imperial quart (imp qt) using the exact conversion factor (1 imperial fluid ounce = 0.025 imperial quart). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial fluid ounces to Imperial quarts converter
Converter
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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 2.84130625e-5 / 0.0011365225.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial fluid ounces to Imperial quarts
Imperial fluid ounce 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 fluid ounce is typically associated with united Kingdom (historically; less common in current UK retail than metric units), while Imperial quart is typically associated with united Kingdom and Commonwealth countries (historically).
Formula
imperial quarts = imperial fluid ounces × 0.025
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial fluid ounce equals 0.0000284130625 base units, and 1 imperial quart equals 0.0011365225 base units, so dividing one by the other gives the direct imperial fluid ounce-to-imperial quart factor of 0.025.
Simple example
1 imp fl oz × 0.025 = 0.025 imp qt
1 imperial fluid ounce = 0.025 imperial quarts.
Real-world example
10 imp fl oz × 0.025 = 0.25 imp qt
10 imperial fluid ounces = 0.25 imperial quarts.
Conversion table
| Imperial fluid ounce (imp fl oz) | Imperial quart (imp qt) |
|---|---|
| 1 imp fl oz | 0.025 imp qt |
| 5 imp fl oz | 0.125 imp qt |
| 10 imp fl oz | 0.25 imp qt |
| 25 imp fl oz | 0.625 imp qt |
| 50 imp fl oz | 1.25 imp qt |
| 100 imp fl oz | 2.5 imp qt |
Reverse conversion: Imperial quart to Imperial fluid ounce
0.025 imp qt × 40 = 1 imp fl oz
0.025 imperial quarts = 1 imperial fluid ounce.
imperial fluid ounces = imperial quarts × 40
For a page dedicated to this direction, see Imperial quart to Imperial fluid ounce.
Imperial fluid ounce vs. Imperial quart
| Aspect | Imperial fluid ounce | Imperial quart |
|---|---|---|
| Family | UK/imperial customary unit | UK/imperial customary unit |
| Typical use | UK/Commonwealth beverage measurement in historical or specialized contexts | UK/Commonwealth liquid measurement in historical or specialized contexts |
| Where it's used | United Kingdom (historically; less common in current UK retail than metric units) | United Kingdom and Commonwealth countries (historically) |
Understanding the Imperial fluid ounce
Imperial fluid ounce (imp fl oz) measures volume. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom (historically; less common in current UK retail than metric units)
Imperial fluid ounce vs. US fluid ounce. Confusingly, the imperial fluid ounce (28.41 mL) is slightly smaller than the US fluid ounce (29.57 mL), even though the imperial gallon is larger overall — because the imperial gallon is divided into 160 fluid ounces rather than the US gallon's 128.
Uses of the Imperial fluid ounce today
- UK/Commonwealth beverage measurement in historical or specialized contexts
History of the Imperial fluid ounce
The imperial fluid ounce follows from Britain's 1824 imperial gallon, divided into 160 parts rather than the 128 used in the US system, producing its counterintuitively smaller size relative to the US fluid ounce.
Historical origin. Imperial fluid ounce 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 fluid ounce — sources
- UK Weights and Measures Act 1824 — Basis for the imperial fluid ounce via the imperial gallon.
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 fluid ounce?
1 imperial fluid ounce equals 0.025 imperial quarts, using the exact defined conversion factor rather than an estimate.
How do I convert imperial fluid ounce to imperial quart?
Multiply the imperial fluid ounce value by 0.025. The converter above does this instantly to whatever precision you set.
How do I convert imperial quart back to imperial fluid ounce?
Use the reverse factor: 1 imperial quart equals 40 imperial fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a imperial fluid ounce?
Imperial fluid ounce (imp fl oz) measures volume. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. 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 fluid ounce 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 fluid ounce vs. us fluid ounce?
Confusingly, the imperial fluid ounce (28.41 mL) is slightly smaller than the US fluid ounce (29.57 mL), even though the imperial gallon is larger overall — because the imperial gallon is divided into 160 fluid ounces rather than the US gallon's 128.
Where is the imperial fluid ounce still used today?
United Kingdom (historically; less common in current UK retail than metric units)