421 centiliters in US quarts
Result
The conversion result is: 421 centiliters is equivalent to 4.44865736171122 US quarts.[1]
Conversion formula
How to convert 421 centiliters to US quarts?
We know (by definition) that: 1 centiliter ≈ 0.0105668820943259 usquart.
We can set up a proportion to solve for the number of US quarts.
1 centiliter / 421 centiliter ≈ 0.0105668820943259 usquart / x usquart
Now, we cross multiply to solve for our unknown x:
x usquart ≈ (421 centiliter / 1 centiliter) * 0.0105668820943259 usquart → x usquart ≈ 4.448657361711204 usquart
Conclusion:
421 centiliter ≈ 4.448657361711204 usquart

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US quart is equal to 0.22478692304038 times 421 centiliters.
It can also be expressed as: 421 centiliters is equal to 1 / 0.22478692304038 US quarts.
Approximation
An approximate numerical result would be: four hundred and twenty-one centiliters is about four point four five US quarts, or alternatively, a US quart is about zero point two two times four hundred and twenty-one centiliters.
Footnotes
[1] 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.