100 1 054 105 4ft 2.
Multiplier for 3 12 roof.
Roof pitch degree table.
800 multiplied by 1 16.
This will give you the rise over run or pitch.
The pitch of this roof is 4 8 12.
If this isn t practical then perform the same measurement on the underside of the roof.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
That gives you 5 590 square feet which is the actual area of the surface of the roof.
Find the value of 7 12 from the roof slope multiplier table which is 1 16.
For example if you measure 4 inches the pitch of your roof is 4 12.
We included a roof pitch chart below the 7 12 example image and the calculator below that.
Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10.
Divide the rise by the run the run is 12.
It affects walkability as well as drainage and roofs in areas of high rain.
Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118.
48 10 4 8.
The pitch of the roof is the rise over a 12 inch run.
Get your roof size by using this roof pitch calculator.
Roof pitch area multipliers.
For example a 4 12 pitch roof that is 100 square feet.
The calculator above can handle much of this math.
With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof.
Now divide the rise by the multiplier to get the pitch eg.
The value arrived at 928 reflects the square feet of the roof.
Multiply 20 and 40 which equals 800.
Multiply step 1 and step 2 i e.
Also the multiplier is so close to one that it does not really change the total size unless your roof is something like a 100 100.
And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier.
Use our roof pitch calculator to find the pitch of your roof.
Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.
Outside of the u s a degree angle is typically used.
Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch.
We excluded roof multipliers for pitch below 3 and above 12 for the following reasons.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.
