397 milliliters in US quarts
Result
The conversion result is: 397 milliliters is equivalent to 0.41950521914474 US quarts.[1]
Conversion formula
How to convert 397 milliliters to US quarts?
We know (by definition) that: 1 ml ≈ 0.00105668820943259 usquart.
We can set up a proportion to solve for the number of US quarts.
1 ml / 397 ml ≈ 0.00105668820943259 usquart / x usquart
Now, we cross multiply to solve for our unknown x:
x usquart ≈ (397 ml / 1 ml) * 0.00105668820943259 usquart → x usquart ≈ 0.41950521914473826 usquart
Conclusion:
397 ml ≈ 0.41950521914473826 usquart

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US quart is equal to 2.38376056926952 times 397 milliliters.
It can also be expressed as: 397 milliliters is equal to 1 / 2.38376056926952 US quarts.
Approximation
An approximate numerical result would be: three hundred and ninety-seven milliliters is about zero point four two US quarts, or alternatively, a US quart is about two point three seven times three hundred and ninety-seven milliliters.
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.