A US liquid quart is one quarter of a US gallon.
Quarts to Imperial fluid ounces Converter — qt to imp fl oz
Convert Quart (qt) to Imperial fluid ounce (imp fl oz) using the exact conversion factor (1 quart = 33.30696739 imperial fluid ounce). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
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 0.000946352946 / 2.84130625e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Quarts to Imperial fluid ounces
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. Quart is typically associated with united States (cooking, dairy, motor oil packaging), while Imperial fluid ounce is typically associated with united Kingdom (historically; less common in current UK retail than metric units).
Formula
imperial fluid ounces = quarts × 33.3069673852
This factor comes from each unit's defined relationship to the category's base unit: 1 quart equals 0.000946352946 base units, and 1 imperial fluid ounce equals 0.0000284130625 base units, so dividing one by the other gives the direct quart-to-imperial fluid ounce factor of 33.3069673852.
Simple example
1 qt × 33.30696739 = 33.30696739 imp fl oz
1 quart = 33.30696739 imperial fluid ounces.
Real-world example
10 qt × 33.30696739 = 333.0696739 imp fl oz
10 quarts = 333.0696739 imperial fluid ounces.
Conversion table
| Quart (qt) | Imperial fluid ounce (imp fl oz) |
|---|---|
| 1 qt | 33.30696739 imp fl oz |
| 5 qt | 166.5348369 imp fl oz |
| 10 qt | 333.0696739 imp fl oz |
| 25 qt | 832.6741846 imp fl oz |
| 50 qt | 1,665.348369 imp fl oz |
| 100 qt | 3,330.696739 imp fl oz |
Reverse conversion: Imperial fluid ounce to Quart
33.30696739 imp fl oz × 0.03002374814 = 1 qt
33.30696739 imperial fluid ounces = 1 quarts.
quarts = imperial fluid ounces × 0.0300237481376
For a page dedicated to this direction, see Imperial fluid ounce to Quart.
Quart vs. Imperial fluid ounce
| Aspect | Quart | Imperial fluid ounce |
|---|---|---|
| Family | US customary unit | UK/imperial customary unit |
| Typical use | US recipe measurement (larger liquid volumes) | UK/Commonwealth beverage measurement in historical or specialized contexts |
| Where it's used | United States (cooking, dairy, motor oil packaging) | United Kingdom (historically; less common in current UK retail than metric units) |
Understanding the Quart
Quart (qt) measures volume. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. It is classified as a US customary unit.
Where it's used: United States (cooking, dairy, motor oil packaging)
Uses of the Quart today
- US recipe measurement (larger liquid volumes)
- US motor oil and automotive fluid packaging
- US dairy and beverage packaging (quart containers)
History of the Quart
The quart ('quarter' of a gallon) follows the same English wine-gallon lineage as the US gallon, retained by the US after England moved to a different imperial standard in 1824.
Historical origin. 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.
Quart — sources
- NIST Handbook 44, Appendix C — General tables of units including the US quart definition.
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 quart?
1 quart equals 33.30696739 imperial fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert quart to imperial fluid ounce?
Multiply the quart value by 33.30696739. The converter above does this instantly to whatever precision you set.
How do I convert imperial fluid ounce back to quart?
Use the reverse factor: 1 imperial fluid ounce equals 0.0300237481 quarts. You can also use the swap control in the converter above to flip the direction instantly.
What is a quart?
Quart (qt) measures volume. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 liters. It is classified as a US 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 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 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 quart still used today?
United States (cooking, dairy, motor oil packaging)