An imperial quart is one quarter of an imperial gallon.
Imperial quarts to Fluid ounces Converter — imp qt to fl oz
Convert Imperial quart (imp qt) to Fluid ounce (fl oz) using the exact conversion factor (1 imperial quart = 38.43039762 fluid ounce). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial quarts to 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.
A US fluid ounce is 1/128 of a US gallon.
Result = input x 0.0011365225 / 2.95735296e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial quarts to Fluid ounces
Imperial quart and 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 Fluid ounce is typically associated with united States (beverage, nutrition labeling).
Formula
fluid ounces = imperial quarts × 38.4303976162
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 fluid ounce equals 0.0000295735295625 base units, so dividing one by the other gives the direct imperial quart-to-fluid ounce factor of 38.4303976162.
Simple example
1 imp qt × 38.43039762 = 38.43039762 fl oz
1 imperial quart = 38.43039762 fluid ounces.
Real-world example
10 imp qt × 38.43039762 = 384.3039762 fl oz
10 imperial quarts = 384.3039762 fluid ounces.
Conversion table
| Imperial quart (imp qt) | Fluid ounce (fl oz) |
|---|---|
| 1 imp qt | 38.43039762 fl oz |
| 5 imp qt | 192.1519881 fl oz |
| 10 imp qt | 384.3039762 fl oz |
| 25 imp qt | 960.7599404 fl oz |
| 50 imp qt | 1,921.519881 fl oz |
| 100 imp qt | 3,843.039762 fl oz |
Reverse conversion: Fluid ounce to Imperial quart
38.43039762 fl oz × 0.02602106827 = 1 imp qt
38.43039762 fluid ounces = 1 imperial quarts.
imperial quarts = fluid ounces × 0.0260210682697
For a page dedicated to this direction, see Fluid ounce to Imperial quart.
Imperial quart vs. Fluid ounce
| Aspect | Imperial quart | Fluid ounce |
|---|---|---|
| Family | UK/imperial customary unit | US customary unit |
| Typical use | UK/Commonwealth liquid measurement in historical or specialized contexts | US beverage container sizing (soda, water bottles) |
| Where it's used | United Kingdom and Commonwealth countries (historically) | United States (beverage, nutrition labeling) |
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 Fluid ounce
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Where it's used: United States (beverage, nutrition labeling)
Uses of the Fluid ounce today
- US beverage container sizing (soda, water bottles)
- US nutrition and medication dosing labels
History of the Fluid ounce
The US fluid ounce follows from the same English wine-gallon system as the rest of the US liquid volume units, defined as a consistent fraction of the gallon.
Historical origin. 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.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many fluid ounces are in 1 imperial quart?
1 imperial quart equals 38.43039762 fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert imperial quart to fluid ounce?
Multiply the imperial quart value by 38.43039762. The converter above does this instantly to whatever precision you set.
How do I convert fluid ounce back to imperial quart?
Use the reverse factor: 1 fluid ounce equals 0.0260210683 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 fluid ounce?
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Is the imperial quart to fluid ounce conversion exact?
Yes. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. 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)