Just follow these easy steps to determine how much stone you will need.

1.Measure the width and the height of the area to be covered and convert to square footage; width x height = total square footage

2.Figure the square footage of any windows and doors and subtract this amount from the first figure (total square footage - windows and doors).

3.Determine how many linear feet of corner pieces you'll need. Measure the linear footage of outside 90° corner pieces and convert to
 
square feet. One linear foot of corners will cover about 1/2 square foot of flat area - ie, 20 linear feet of corners = 10 square feet of flat area.

Subtract this flat area amount from the total square footage to determine how much total stone you will need. You should allow an extra

5 -10% more stone for cutting and trimming on both corners and flats.