Conversion formula

The conversion factor from fluid ounces to quarts is 0.03125, which means that 1 fluid ounce is equal to 0.03125 quarts:

1 fl oz = 0.03125 qt

To convert 640 fluid ounces into quarts we have to multiply 640 by the conversion factor in order to get the volume amount from fluid ounces to quarts. We can also form a simple proportion to calculate the result:

1 fl oz → 0.03125 qt

640 fl oz → V_(qt)

Solve the above proportion to obtain the volume V in quarts:

V_(qt) = 640 fl oz × 0.03125 qt

V_(qt) = 20 qt

The final result is:

640 fl oz → 20 qt

We conclude that 640 fluid ounces is equivalent to 20 quarts:

640 fluid ounces = 20 quarts

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 quart is equal to 0.05 × 640 fluid ounces.

Another way is saying that 640 fluid ounces is equal to 1 ÷ 0.05 quarts.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred forty fluid ounces is approximately twenty quarts:

640 fl oz ≅ 20 qt

An alternative is also that one quart is approximately zero point zero five times six hundred forty fluid ounces.

Conversion table

fluid ounces to quarts chart

For quick reference purposes, below is the conversion table you can use to convert from fluid ounces to quarts