Multiply the pieces by inches based on exposure then divide by feet.
How to measure roof shingles from the ground.
Research other methods for measuring a roof from the ground online or talk to a roofing contractor.
Multiple the number of shingles times the width of each shingle which you can measure at ground level to get b in the figure below.
Use a simple formula to approximate the square footage of triangular areas where two sections of a roof meet at each.
Next divide your total area by 100 to calculate the number of roofing squares you ll need to buy.
To measure for roofing shingles start by calculating the area of each plane or section of the roof.
Exposure comp shingles 5 5 shake 10 tile 13 5 14.
Measure the horizontal run of the roof surface from the ground a in the third figure below.
Then count the number of shingles to the peak of the roof.
You may want to measure a couple to be sure.
Visually count how many rows of existing roofing multiply by inches base on exposure then divide by feet.