# 21 miles in feet

## Conversion

21 miles is equivalent to 110880 feet.[1]

## Conversion formula How to convert 21 miles to feet?

We know (by definition) that: $1\mathrm{mile}=5280\mathrm{ft}$

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

$1 ⁢ mile 21 ⁢ mile = 5280 ⁢ ft x ⁢ ft$

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

$x\mathrm{ft}=\frac{21\mathrm{mile}}{1\mathrm{mile}}*5280\mathrm{ft}\to x\mathrm{ft}=110880\mathrm{ft}$

Conclusion: $21 ⁢ mile = 110880 ⁢ ft$

## Conversion in the opposite direction

The inverse of the conversion factor is that 1 foot is equal to 9.01875901875902e-06 times 21 miles.

It can also be expressed as: 21 miles is equal to $\frac{1}{\mathrm{9.01875901875902e-06}}$ feet.

## Approximation

An approximate numerical result would be: twenty-one miles is about one hundred and ten thousand, eight hundred and eighty feet, or alternatively, a foot is about zero times twenty-one miles.

## 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.