21 feet in meters

Conversion formula
How to convert 21 feet to meters?

We know (by definition) that: $1\mathrm{ft}=0.3048\mathrm{m}$

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

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

Conclusion: 21 ⁢ ft = 6.4008 ⁢ m

Conversion in the opposite direction

The inverse of the conversion factor is that 1 meter is equal to 0.156230471191101 times 21 feet.

It can also be expressed as: 21 feet is equal to $\frac{1}{\mathrm{0.156230471191101}}$ meters.

Approximation

An approximate numerical result would be: twenty-one feet is about six point four zero meters, or alternatively, a meter is about zero point one six times twenty-one feet.