If you have a simple gable roof you ll only need to measure and sum up the 2 planes of the roof.
Formula for estimating roof replacement.
If it has overhangs add them to your sizes.
Find the square footage of the roof.
If you have multiple sections of roof find the area of each and add them together to find the total area.
Dimensions measured from the ground.
The length l times the height h of a triangle is twice its area a2.
The roof shingle calculator is a free estimator that serves a useful purpose during any roof repair or replacement project.
This free roofing calculator estimates the area of a roof and the amount of materials required to replace or build said roof.
This gives us a 3d roof area of 1 625 sq ft.
1 roof square 100 square feet.
Find the area of a roof multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet.
Measure the length and width of each portion of the roof multiply length by width for each plane and then add the planes together for the total square footage.
For estimating purposes we also assume that there is a chimney a couple of dormers and two layers of old shingles that need to be torn off and removed before a new roof can be installed.
Calculate the size of your roof and estimate how many bundles of asphalt shingles rolls of felt and squares of roofing material are needed for a new roof.
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Assuming this is a hip roof we multiply this by 1 1 which gives us roughly 18 squares or 1 800 square feet of the roof surface.
If overhangs are 6 add 1 foot to each side.
So if you divide your answer of a product of length times height by two you will get the area of a triangle.
If overhangs are 2 feet on front an back and there are no overhangs on the sides add 4 feet to the appropriate side.
Calculating an area of a triangle when estimating a roof.