21 feet in inches

Result

The conversion result is: 21 feet is equivalent to 252 inches.[1]

Conversion formula
How to convert 21 feet to inches?

We know (by definition) that: 1 ft = 12 in.

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

1 ft / 21 ft = 12 in / x in

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

x in = (21 ft / 1 ft) * 12 in → x in = 252 in

Conclusion:

21 ft = 252 in

Conversion in the opposite direction

The inverse of the conversion factor is that 1 inch is equal to 0.00396825396825397 times 21 feet.

It can also be expressed as: 21 feet is equal to 1 / 0.00396825396825397 inches.

Approximation

An approximate numerical result would be: twenty-one feet is about two hundred and fifty-two inches, or alternatively, a inch is about zero times twenty-one feet.

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.