To convert cups to quarts (cup to qt), multiply by 0.25. 1 cup equals 0.25 qt, about 67% of a soft-drink can.
| cups | quarts |
|---|---|
| 1 cup | 0.25 qt |
| 2 cups | 0.5 qt |
| 5 cups | 1.25 qt |
| 10 cups | 2.5 qt |
| 25 cups | 6.25 qt |
| 50 cups | 12.5 qt |
| 100 cups | 25 qt |
| 250 cups | 62.5 qt |
| 500 cups | 125 qt |
| 1000 cups | 250 qt |
The factor is exactly 0.25. It is a terminating decimal, so nothing on this page is rounded.
For mental arithmetic the factor is close enough to 0.25 to use directly: multiply cups by 0.25 and the answer is right to within a rounding error.
Going the other way, one quart is 4 cup, which is usually the easier direction to work in. Because the forward factor is small, watch the decimal place rather than the digits: a factor-of-ten slip is the common error, not a rounding one.
To anchor the scale: 5 cups is about 1.25 qt.