521 miles in kilometers

Conversion formula
How to convert 521 miles to kilometers?

We know (by definition) that: $1\mathrm{mile}=1.609344\mathrm{km}$

We can set up a proportion to solve for the number of kilometers.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 521 ⁢ mile = 838.4682240000001 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 0.00119265104076264 times 521 miles.

It can also be expressed as: 521 miles is equal to $\frac{1}{\mathrm{0.00119265104076264}}$ kilometers.

Approximation

An approximate numerical result would be: five hundred and twenty-one miles is about eight hundred and thirty-eight point four seven kilometers, or alternatively, a kilometer is about zero times five hundred and twenty-one miles.