401 yards in kilometers
Result
The conversion result is: 401 yards is equivalent to 0.3666744 kilometers.[1]
Conversion formula
How to convert 401 yards to kilometers?
We know (by definition) that: 1 yd = 0.0009144 km.
We can set up a proportion to solve for the number of kilometers.
1 yd / 401 yd = 0.0009144 km / x km
Now, we cross multiply to solve for our unknown x:
x km = (401 yd / 1 yd) * 0.0009144 km → x km = 0.3666744 km
Conclusion:
401 yd = 0.3666744 km

Conversion in the opposite direction
The inverse of the conversion factor is that 1 kilometer is equal to 2.72721520782471 times 401 yards.
It can also be expressed as: 401 yards is equal to 1 / 2.72721520782471 kilometers.
Approximation
An approximate numerical result would be: four hundred and one yards is about zero point three seven kilometers, or alternatively, a kilometer is about two point seven three times four hundred and one yards.
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.