A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Quarts Converter — fl oz to qt
Convert Fluid ounce (fl oz) to Quart (qt) using the exact conversion factor (1 fluid ounce = 0.03125 quart). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Fluid ounces to 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.
A US liquid quart is one quarter of a US gallon.
Result = input x 2.95735296e-5 / 0.000946352946.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Quarts
Fluid ounce and 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 Quart is typically associated with united States (cooking, dairy, motor oil packaging).
Formula
quarts = fluid ounces × 0.03125
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 quart equals 0.000946352946 base units, so dividing one by the other gives the direct fluid ounce-to-quart factor of 0.03125.
Simple example
1 fl oz × 0.03125 = 0.03125 qt
1 fluid ounce = 0.03125 quarts.
Real-world example
10 fl oz × 0.03125 = 0.3125 qt
10 fluid ounces = 0.3125 quarts.
Conversion table
| Fluid ounce (fl oz) | Quart (qt) |
|---|---|
| 1 fl oz | 0.03125 qt |
| 5 fl oz | 0.15625 qt |
| 10 fl oz | 0.3125 qt |
| 25 fl oz | 0.78125 qt |
| 50 fl oz | 1.5625 qt |
| 100 fl oz | 3.125 qt |
Reverse conversion: Quart to Fluid ounce
0.03125 qt × 32 = 1 fl oz
0.03125 quarts = 1 fluid ounce.
fluid ounces = quarts × 32
For a page dedicated to this direction, see Quart to Fluid ounce.
Fluid ounce vs. Quart
| Aspect | Fluid ounce | Quart |
|---|---|---|
| Family | US customary unit | US customary unit |
| Typical use | US beverage container sizing (soda, water bottles) | US recipe measurement (larger liquid volumes) |
| Where it's used | United States (beverage, nutrition labeling) | United States (cooking, dairy, motor oil packaging) |
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 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.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce definition.
Quart — sources
- NIST Handbook 44, Appendix C — General tables of units including the US quart definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many quarts are in 1 fluid ounce?
1 fluid ounce equals 0.03125 quarts, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to quart?
Multiply the fluid ounce value by 0.03125. The converter above does this instantly to whatever precision you set.
How do I convert quart back to fluid ounce?
Use the reverse factor: 1 quart equals 32 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 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.
Is the fluid ounce to quart conversion exact?
Yes. The US liquid quart is exactly one-quarter of a US gallon: 0.946352946 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.
Where is the fluid ounce still used today?
United States (beverage, nutrition labeling)