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21 Fluid Ounces to Quarts

21 fluid ounces equals 0.6563 quarts. Use the formula, worked example, and conversion table below to check the math.

21 fl oz = 0.6563 qt
fl oz ÷ 32 = qt
Try: 16 fl oz to qt 20 fl oz to qt 22 fl oz to qt 26 fl oz to qt
21 fl oz is also
21 fl oz = 0.621 L 21 fl oz = 0.1641 gal 21 fl oz = 621.04 mL 21 fl oz = 2.63 cup 21 fl oz = 1.31 pt 21 fl oz = 42 tbsp 21 fl oz = 126 tsp
fl oz
0.6563 qt

How to Convert Fluid Ounces to Quarts

fl oz ÷ 32 = qt
  1. Start with 21 fl oz
  2. Divide by 32: 21 ÷ 32 = 0.6563
  3. Result: 21 fl oz = 0.6563 qt

The same formula works for any value. Multiply by 0.03125 to go from fluid ounces to quarts.

Common Fluid Ounce to Quart Conversions

Fluid Ounces (fl oz) Quarts (qt)
1 fl oz 0.0313 qt
2 fl oz 0.0625 qt
5 fl oz 0.1563 qt
10 fl oz 0.3125 qt
15 fl oz 0.4688 qt
20 fl oz 0.625 qt
21 fl oz 0.6563 qt
25 fl oz 0.7813 qt
50 fl oz 1.56 qt
75 fl oz 2.34 qt
100 fl oz 3.13 qt
250 fl oz 7.81 qt
500 fl oz 15.63 qt
1,000 fl oz 31.25 qt
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Frequently Asked Questions

21 fluid ounces equals 0.6563 quarts.
The formula is: fl oz ÷ 32 = qt. See the fl oz to qt formula page for worked examples.
Use the quarts to fluid ounces converter. The reverse formula is: qt × 32 = fl oz.
The calculator uses the full-precision conversion factor for accuracy. Table values and displayed results are rounded for readability.
The conversion formula (fl oz ÷ 32 = qt) is based on internationally defined standards. Displayed results are rounded for readability, while the calculator uses the full-precision factor.
person Written by Sean Day verified Reviewed by UnitCompare update Last updated Mar 28, 2026