Product coverage:

Most rock and mulches are based on 1 yard or 1 ton.
That will cover a 100 sq. ft. or 10ft x 10ft area at 2" deep.

 

How to measure:

Measure the length (in feet) then multiply it by the width (in feet). The end result will give you the total square footage.

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Example:

On the shown example there are 2 flower beds,
one on each side of the sidewalk.

The picture below explains in more detail how
to measure shaped spaces correctly.
(Click on image to enlarge)

In this example, the total comes to 149.5 sf,
which means you'll need 1.5 yards of mulch
or 1.5 tons of rock.