423 metric teaspoons in US quarts
Conversion
423 metric teaspoons is equivalent to 2.23489556294994 US quarts.[1]
Conversion formula
How to convert 423 metric teaspoons 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 :
Conclusion:

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US quart is equal to 0.44744820141844 times 423 metric teaspoons.
It can also be expressed as: 423 metric teaspoons is equal to US quarts.
Approximation
An approximate numerical result would be: four hundred and twenty-three metric teaspoons is about two point two three US quarts, or alternatively, a US quart is about zero point four five times four hundred and twenty-three metric teaspoons.
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.