An imperial quart is one quarter of an imperial gallon.
Imperial quarts to Imperial fluid ounces Converter — imp qt to imp fl oz
Convert Imperial quart (imp qt) to Imperial fluid ounce (imp fl oz) using the exact conversion factor (1 imperial quart = 40 imperial fluid ounce). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial quarts to Imperial fluid ounces 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 fluid ounce is 1/160 of an imperial gallon.
Result = input x 0.0011365225 / 2.84130625e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial quarts to Imperial fluid ounces
Imperial quart and Imperial fluid ounce 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 Imperial fluid ounce is typically associated with united Kingdom (historically; less common in current UK retail than metric units).
Formula
imperial fluid ounces = imperial quarts × 40
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 imperial fluid ounce equals 0.0000284130625 base units, so dividing one by the other gives the direct imperial quart-to-imperial fluid ounce factor of 40.
Simple example
1 imp qt × 40 = 40 imp fl oz
1 imperial quart = 40 imperial fluid ounces.
Real-world example
10 imp qt × 40 = 400 imp fl oz
10 imperial quarts = 400 imperial fluid ounces.
Conversion table
| Imperial quart (imp qt) | Imperial fluid ounce (imp fl oz) |
|---|---|
| 1 imp qt | 40 imp fl oz |
| 5 imp qt | 200 imp fl oz |
| 10 imp qt | 400 imp fl oz |
| 25 imp qt | 1,000 imp fl oz |
| 50 imp qt | 2,000 imp fl oz |
| 100 imp qt | 4,000 imp fl oz |
Reverse conversion: Imperial fluid ounce to Imperial quart
40 imp fl oz × 0.025 = 1 imp qt
40 imperial fluid ounces = 1 imperial quart.
imperial quarts = imperial fluid ounces × 0.025
For a page dedicated to this direction, see Imperial fluid ounce to Imperial quart.
Imperial quart vs. Imperial fluid ounce
| Aspect | Imperial quart | Imperial fluid ounce |
|---|---|---|
| Family | UK/imperial customary unit | UK/imperial customary unit |
| Typical use | UK/Commonwealth liquid measurement in historical or specialized contexts | UK/Commonwealth beverage measurement in historical or specialized contexts |
| Where it's used | United Kingdom and Commonwealth countries (historically) | United Kingdom (historically; less common in current UK retail than metric units) |
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 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.
Imperial quart — sources
- UK Weights and Measures Act 1824 — Basis for the imperial quart via the imperial gallon.
Imperial fluid ounce — sources
- UK Weights and Measures Act 1824 — Basis for the imperial fluid ounce via the imperial gallon.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial fluid ounces are in 1 imperial quart?
1 imperial quart equals 40 imperial fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert imperial quart to imperial fluid ounce?
Multiply the imperial quart value by 40. The converter above does this instantly to whatever precision you set.
How do I convert imperial fluid ounce back to imperial quart?
Use the reverse factor: 1 imperial fluid ounce equals 0.025 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 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.
Is the imperial quart to imperial fluid ounce conversion exact?
Yes. 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. 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)