21 kilometers in miles

Result

The conversion result is: 21 kilometers is equivalent to 13.048795036984 miles.[1]

Conversion formula
How to convert 21 kilometers to miles?

We know (by definition) that: 1 km ≈ 0.62137119 mile.

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

1 km / 21 km ≈ 0.62137119 mile / x mile

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

x mile ≈ (21 km / 1 km) * 0.62137119 mile → x mile ≈ 13.04879499 mile

Conclusion:

21 km ≈ 13.04879499 mile

Conversion in the opposite direction

The inverse of the conversion factor is that 1 mile is equal to 0.0766354285714286 times 21 kilometers.

It can also be expressed as: 21 kilometers is equal to 1 / 0.0766354285714286 miles.

Approximation

An approximate numerical result would be: twenty-one kilometers is about thirteen point zero five miles, or alternatively, a mile is about zero point zero eight times twenty-one kilometers.

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.