A US liquid quart is a standard volume unit used in cooking and everyday measurements. One US liquid quart equals 946.352946 milliliters. We use this exact number to convert quarts to milliliters by multiplying the number of quarts by 946.352946.

Quick formula

To convert quarts (US) to milliliters:

milliliters = quarts × 946.352946

Example: 5 quarts = 5 × 946.352946 = 4,731.76473 mL.

If you need to go the other way (milliliters → quarts), divide the milliliter value by the same factor:

quarts = milliliters ÷ 946.352946

What the units mean

• Quart (US liquid) the US liquid quart is one quarter of a US gallon, or two pints (four cups). When people say “quart” in recipes or consumer packaging in the United States, they almost always mean the US liquid quart. Note that there are other quart definitions (imperial quart and US dry quart) and those are not equal to the US liquid quart.
• Milliliter (mL) a milliliter is a metric unit of volume equal to one cubic centimeter (1 mL = 1 cm³) and is 1/1,000 of a liter. Milliliters are commonly used for small to medium liquid volumes (medical dosages, recipes, lab measurements).

Common conversions

• 0.25 qt = 236.5882365 mL
• 0.5 qt = 473.176473 mL
• 1 qt = 946.352946 mL
• 2 qt = 1,892.705892 mL
• 4 qt = 3,785.411784 mL (1 gallon)
• 10 qt = 9,463.52946 mL.

Practical tips & rounding

• For everyday cooking, rounding 1 quart to 946 mL or 950 mL is usually fine and won’t affect most recipes. For laboratory or scientific work, keep the full precision (946.352946 mL) and match the number of significant figures to your measurement tools.
• If you’re converting large volumes, convert first using the full precision and then round at the end to avoid cumulative rounding error. For example, calculate with the full factor and then round the final result to the nearest milliliter, tenth, or whole number depending on how precise you need it to be.

Why the number looks odd

The conversion factor (946.352946) arises because the metric liter and the US customary gallon are defined in different systems. That mix produces non-round decimal values when converting between the two systems, hence the long decimal. Using the exact value ensures accurate results whether you’re scaling a recipe or preparing a lab solution.

When quart ≠ quart

• US liquid quart – the standard for recipes and most consumer measures in the U.S. (this is the converter used here).
• US dry quart – used historically for dry goods (not the same as the liquid quart).
• Imperial quart – used in some Commonwealth countries historically; its size differs from the US liquid quart. Always confirm which quart your source means before converting.

Sources: Inch Calculator, UnitConverters.net, LivelyTable, Dwello, ConvertUnits.com, CheckYourMath, Calpac Lab, XConvert.