Fluid Ounces to Quarts Converter

Free two-way liquid-volume converter

Fluid Ounces to Quarts Converter

Convert fluid ounces to quarts or quarts to fluid ounces after choosing U.S. liquid or Imperial measure. The calculator applies the exact same-system relationship, keeps fractions exact, and labels every answer so 32 U.S. fluid ounces are never confused with 40 Imperial fluid ounces.

Last Updated: August 7, 2026

U.S. liquid and Imperial systems
Exact rational arithmetic
Two conversion directions
Decimal or significant-figure rounding

Convert Fluid Ounces and Quarts

Enter a nonnegative decimal, scientific-notation value, simple fraction or mixed number. Select the correct volume system before converting.

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Enter Your Liquid Volume

This page pairs U.S. fluid ounces with U.S. liquid quarts, or Imperial fluid ounces with Imperial quarts. It does not convert ounces of mass or U.S. dry quarts.

Volume system

Conversion direction

Volume in U.S. fluid ounces Enter 32, 64, 1e3, 1/2 or 1 1/2. Leave out US fl oz and commas.

Display precision

Decimal places

Rounding rule

Formula: U.S. liquid quarts = U.S. fluid ounces ÷ 32. The exact factor stays unrounded.

Try a complete example

U.S. fluid ounces to liquid quarts

1.000000 US liq qt

32 US fl oz converted with the exact U.S. liquid relationship.

Entered value32 US fl oz

Exact target value1 US liq qt

High-precision comparison1 US liq qt

Exact system relationship1 US liq qt = 32 US fl oz

Mixed capacity1 US liq qt

Same-system equivalents0.25 US gal | 1 US liq qt | 2 US liq pt | 32 US fl oz

Metric equivalent0.946352946 L | 946.352946 mL

Other-system comparison≈ 0.83267418462899 imp qt | ≈ 33.306967385160 imp fl oz

Final rounding change0 US liq qt

Calculation Steps

Use 1 U.S. liquid quart = 32 U.S. fluid ounces exactly.
Divide 32 US fl oz by 32 to obtain exactly 1 US liq qt.
Round the final value once to 6 decimal places: 1.000000 US liq qt.
Keep U.S. liquid labels on the result and comparisons.

The U.S. liquid relationship is exact. The main result uses 6 decimal places with nearest rounding, ties to even. Extra displayed digits do not add accuracy to the original measurement.

How to Use This Fluid Ounces to Quarts Converter

Allow about two minutes for one conversion, including a quick check of the volume system and reporting precision.

Select the volume system. Choose U.S. liquid measure or Imperial measure. The choice changes both unit sizes and the number of fluid ounces in one quart.
Select the direction. Choose fluid ounces to quarts or quarts to fluid ounces.
Enter one liquid volume. Use a decimal such as 64, scientific notation such as 1e3, a fraction such as 1/2, or a mixed number such as 1 1/2. Leave the unit symbol out.
Choose display precision. Select decimal places or significant figures, enter the required count, and choose a tie rule.
Press Convert. Review the rounded answer, exact target value, system relationship, metric equivalent and calculation steps.
Copy, swap or reset. Copy the complete labelled result, swap directions without using a rounded display, or restore the default 32 U.S. fl oz example.

Zero is valid. Negative volume, commas, unit suffixes and malformed fractions are rejected. Changing the system clears the active result so an old U.S. value is never silently presented as Imperial. Fractions remain exact through the calculation.

Fluid Ounces to Quarts Formulas

The correct divisor depends on the chosen system. One U.S. liquid quart contains exactly 32 U.S. fluid ounces. One Imperial quart contains exactly 40 Imperial fluid ounces.

U.S. liquid quarts = U.S. fluid ounces ÷ 32

Imperial quarts = Imperial fluid ounces ÷ 40

Reverse either calculation by multiplying the quart value by the applicable number of same-system fluid ounces.

U.S. fluid ounces = U.S. liquid quarts × 32

Imperial fluid ounces = Imperial quarts × 40

The factors 1/32, 32, 1/40 and 40 are exact. The converter stores the input and factor as integers over integers, then rounds only the requested display. A fraction such as one-third of an Imperial quart therefore remains exactly 40/3 Imperial fluid ounces internally.

Fluid Ounces and Quarts Worked Examples

Example 1: Convert 64 U.S. fluid ounces to quarts

Divide 64 by 32. The result is exactly 2 U.S. liquid quarts.

64 US fl oz ÷ 32 = 2 US liq qt

Example 2: Convert 2.5 U.S. liquid quarts to fluid ounces

Multiply 2.5 by 32. The result is exactly 80 U.S. fluid ounces.

2.5 US liq qt × 32 = 80 US fl oz

Example 3: Convert 20 Imperial fluid ounces to quarts

Divide 20 by 40. The result is exactly 0.5 Imperial quart. Using the U.S. divisor would incorrectly return 0.625 quart.

20 imp fl oz ÷ 40 = 0.5 imp qt

Example 4: Convert 1.5 Imperial quarts to fluid ounces

Multiply 1.5 by 40. The result is exactly 60 Imperial fluid ounces.

1.5 imp qt × 40 = 60 imp fl oz

Fluid Ounces to Quarts Conversion Tables

Every value in these same-system tables is exact. Read the heading before using a row because the U.S. and Imperial numbers are not interchangeable.

U.S. fluid ounces to U.S. liquid quarts

U.S. fluid ounces	U.S. liquid quarts	U.S. liquid gallons
1 US fl oz	0.03125 US liq qt	0.0078125 US gal
4 US fl oz	0.125 US liq qt	0.03125 US gal
8 US fl oz	0.25 US liq qt	0.0625 US gal
16 US fl oz	0.5 US liq qt	0.125 US gal
24 US fl oz	0.75 US liq qt	0.1875 US gal
32 US fl oz	1 US liq qt	0.25 US gal
48 US fl oz	1.5 US liq qt	0.375 US gal
64 US fl oz	2 US liq qt	0.5 US gal
128 US fl oz	4 US liq qt	1 US gal

Imperial fluid ounces to Imperial quarts

Imperial fluid ounces	Imperial quarts	Imperial gallons
1 imp fl oz	0.025 imp qt	0.00625 imp gal
5 imp fl oz	0.125 imp qt	0.03125 imp gal
10 imp fl oz	0.25 imp qt	0.0625 imp gal
20 imp fl oz	0.5 imp qt	0.125 imp gal
30 imp fl oz	0.75 imp qt	0.1875 imp gal
40 imp fl oz	1 imp qt	0.25 imp gal
60 imp fl oz	1.5 imp qt	0.375 imp gal
80 imp fl oz	2 imp qt	0.5 imp gal
160 imp fl oz	4 imp qt	1 imp gal

U.S. Liquid and Imperial Units Are Different

The systems differ at both ends of this conversion. One U.S. fluid ounce is exactly 29.5735295625 mL, while one Imperial fluid ounce is exactly 28.4130625 mL. One U.S. liquid quart is exactly 946.352946 mL, while one Imperial quart is exactly 1136.5225 mL.

Unit	Exact metric equivalent	Same-system relationship
U.S. fluid ounce	29.5735295625 mL	1/32 U.S. liquid quart
U.S. liquid quart	946.352946 mL	32 U.S. fluid ounces
Imperial fluid ounce	28.4130625 mL	1/40 Imperial quart
Imperial quart	1136.5225 mL	40 Imperial fluid ounces

An Imperial quart is approximately 1.2009499255 U.S. liquid quarts. A U.S. liquid quart is approximately 0.8326741846 Imperial quart. The calculator shows the other system only as a labelled comparison; the primary conversion always stays within the selected system, as required by the live converter directory.

Fluid Ounces, Mass Ounces and Dry Quarts

A fluid ounce measures volume. A plain ounce, symbol oz, normally measures mass. The two quantities cannot be exchanged with one fixed factor. Converting 8 oz of flour, oil or water to quarts requires the material’s density, and different substances produce different volumes.

A U.S. dry quart is also different from a U.S. liquid quart. The U.S. dry quart equals exactly 1.101220942715 L, compared with exactly 0.946352946 L for the U.S. liquid quart. There is no matching general-purpose “dry fluid ounce” in the conversion used here.

Read the complete label: Use this calculator only when the source pairs U.S. fluid ounces with U.S. liquid quarts, or Imperial fluid ounces with Imperial quarts. Use a mass converter for oz by weight and the general Volume Converter for U.S. dry quarts.

Exact Factors, Rounding and Measurement Precision

The calculator parses decimals, scientific notation, fractions and mixed numbers as exact rational values. It applies 1/32 or 1/40 in the fluid-ounce-to-quart direction and 32 or 40 in the reverse direction. It does not pass the calculation through a binary floating-point approximation.

The default ties-to-even rule affects an exact halfway case at the selected decimal place or significant digit. The optional ties-away rule supports workflows that specify it. Most everyday inputs are not exact ties, so both rules produce the same displayed answer.

An exact unit relationship does not make the original measurement exact. A bottle labelled 32 US fl oz converts mathematically to 1 US liq qt, but filling tolerances and measuring equipment still affect the physical quantity. Match the final digits to the quality of the source value.

Good practice: Keep the selected system and exact factor through the calculation. Round once at the end. Never reuse a rounded display as the input for a later conversion.

Common Fluid Ounce and Quart Conversion Mistakes

Using 32 for an Imperial conversion. One Imperial quart contains 40 Imperial fluid ounces.
Using 40 for a U.S. conversion. One U.S. liquid quart contains 32 U.S. fluid ounces.
Dropping the word fluid. An ounce of mass is not a fluid ounce of volume.
Mixing liquid and dry quarts. The U.S. dry quart is larger and is not included in this pair-specific tool.
Mixing systems in one formula. U.S. fl oz divided by 40 does not produce a valid U.S. or Imperial same-system conversion.
Reversing multiplication and division. Divide fluid ounces to get quarts. Multiply quarts to get fluid ounces.
Rounding too early. Keep the exact factor until the final answer, especially when the result feeds another calculation.
Reporting unsupported precision. Extra converted digits do not improve a coarsely measured input.

Frequently Asked Questions

How many fluid ounces are in one U.S. quart?

One U.S. liquid quart contains exactly 32 U.S. fluid ounces. Divide U.S. fluid ounces by 32 to get U.S. liquid quarts.

How many fluid ounces are in one Imperial quart?

One Imperial quart contains exactly 40 Imperial fluid ounces. Divide Imperial fluid ounces by 40 to get Imperial quarts.

What is the formula for fluid ounces to quarts?

For U.S. liquid measure, quarts equal fluid ounces divided by 32. For Imperial measure, quarts equal fluid ounces divided by 40.

How do I convert quarts to fluid ounces?

Multiply U.S. liquid quarts by 32 or Imperial quarts by 40. Keep both units in the same measurement system.

Are U.S. and Imperial quarts equal?

No. One U.S. liquid quart is exactly 946.352946 mL, while one Imperial quart is exactly 1136.5225 mL.

Does ounce mean fluid ounce in this calculator?

Yes. Every calculator input and result uses fluid ounces, written fl oz. A plain ounce, written oz, is normally a unit of mass.

Can ounces of mass be converted directly to quarts?

No. Mass and volume are different quantities. Converting ounces by weight to quarts requires the substance’s density and the applicable conditions.

Does this calculator support U.S. dry quarts?

No. This focused tool converts within U.S. liquid or Imperial measure. A U.S. dry quart uses a different volume definition and belongs in the general Volume Converter.

How many quarts is 64 fluid ounces?

Sixty-four U.S. fluid ounces equal exactly 2 U.S. liquid quarts. Sixty-four Imperial fluid ounces equal exactly 1.6 Imperial quarts.

Can I enter fractions or scientific notation?

Yes. The calculator accepts decimals, scientific notation, simple fractions and mixed numbers. Enter zero or a positive volume without a unit symbol or comma.

Method and Official Sources

The U.S. liquid and Imperial subdivision relationships follow NIST Handbook 44, 2026, Appendix C. The exact Imperial gallon metric definition follows the UK Weights and Measures Act 1985, Schedule 1. Conversion and final-rounding guidance follow NIST SP 811, Appendix B, and litre terminology follows the BIPM SI Brochure.

Measurement note: This tool converts entered liquid-volume values. It does not identify an ambiguous unit, measure container capacity, determine density, convert mass to volume, verify package tolerances or provide a certified legal-metrology result.

Fluid Ounces to Quarts Converter | US & Imperial