How to convert 21 deciliters to US quarts?
We know (by definition) that:
We can set up a proportion to solve for the number of US quarts.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US quart is equal to 0.45064426 times 21 deciliters.
It can also be expressed as: 21 deciliters is equal to US quarts.
An approximate numerical result would be: twenty-one deciliters is about two point two two US quarts, or alternatively, a US quart is about zero point four five times twenty-one deciliters.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.