A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Imperial quarts Converter — fl oz to imp qt
Convert Fluid ounce (fl oz) to Imperial quart (imp qt) using the exact conversion factor (1 fluid ounce = 0.0260210683 imperial quart). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Fluid ounces 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 2.95735296e-5 / 0.0011365225.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Imperial quarts
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. Fluid ounce is typically associated with united States (beverage, nutrition labeling), while Imperial quart is typically associated with united Kingdom and Commonwealth countries (historically).
Formula
imperial quarts = fluid ounces × 0.0260210682697
This factor comes from each unit's defined relationship to the category's base unit: 1 fluid ounce equals 0.0000295735295625 base units, and 1 imperial quart equals 0.0011365225 base units, so dividing one by the other gives the direct fluid ounce-to-imperial quart factor of 0.0260210682697.
Simple example
1 fl oz × 0.02602106827 = 0.0260210683 imp qt
1 fluid ounce = 0.0260210683 imperial quarts.
Real-world example
10 fl oz × 0.02602106827 = 0.2602106827 imp qt
10 fluid ounces = 0.2602106827 imperial quarts.
Conversion table
| Fluid ounce (fl oz) | Imperial quart (imp qt) |
|---|---|
| 1 fl oz | 0.0260210683 imp qt |
| 5 fl oz | 0.1301053413 imp qt |
| 10 fl oz | 0.2602106827 imp qt |
| 25 fl oz | 0.6505267067 imp qt |
| 50 fl oz | 1.301053413 imp qt |
| 100 fl oz | 2.602106827 imp qt |
Reverse conversion: Imperial quart to Fluid ounce
0.0260210683 imp qt × 38.43039762 = 1.000000001 fl oz
0.0260210683 imperial quarts = 1.000000001 fluid ounces.
fluid ounces = imperial quarts × 38.4303976162
For a page dedicated to this direction, see Imperial quart to Fluid ounce.
Fluid ounce vs. Imperial quart
| Aspect | Fluid ounce | Imperial quart |
|---|---|---|
| Family | US customary unit | UK/imperial customary unit |
| Typical use | US beverage container sizing (soda, water bottles) | UK/Commonwealth liquid measurement in historical or specialized contexts |
| Where it's used | United States (beverage, nutrition labeling) | United Kingdom and Commonwealth countries (historically) |
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.
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.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce 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 fluid ounce?
1 fluid ounce equals 0.0260210683 imperial quarts, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to imperial quart?
Multiply the fluid ounce value by 0.02602106827. The converter above does this instantly to whatever precision you set.
How do I convert imperial quart back to fluid ounce?
Use the reverse factor: 1 imperial quart equals 38.43039762 fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
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.
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 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 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 fluid ounce still used today?
United States (beverage, nutrition labeling)