Roof Pitch Calculator helps you quickly calculate roof pitch, total roof size, and approximate cost to install new asphalt shingles or standing seam metal roofing system on your roof.
Calculate roof pitch and roof area now:
About Roof Pitch Calculator:
The new addition to our line-up of roofing calculators is a Roof Pitch Calculator, which will help you quickly calculate roof pitch based on the footprint of your roof, as well as provide you with nearly exact roof size.
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With this Roof Pitch Calculator, you can quickly calculate the length of your gable (length of the rafters). All you will have to provide is the ground dimensions of your roof (including the overhangs) and the roof rise from the base of the roof level to the ridge of your roof. Check out our useful guides for more information on how to estimate a roof and how to measure roof pitch.
Another new feature we just added to the Roof Pitch Calculator is the ability to estimate roof installation cost for the 30-years Architectural Roofing Shingle, with more roofing materials to be added soon.
How to properly use the Roof Pitch Calculator:
First of all, you will need to do some leg work – that is grab a measuring tape and measure the outside dimensions of your house – corner to corner. If your roof has an overhang, and most roofs do, add the overhangs to your measurements in every direction. For example if your overhangs are 6 inches, you will add a foot to the length and the width.
Now the terminology that we use in the calculator itself (refer to the image below). By width we imply the full measurement of your gable side, where the roof slopes. Length is the straight side – usually the front and back of your house.
Roof rise: this one is a bit complicated. You will need to estimate off the ground or actually measure the distance from your roof’s ridge, down to the base of the house (see roof measuring diagram above).
If you choose to estimate the roof rise, all you have to do is count the number of rows of siding materials from the roof base to the peak or roof ridge. Now measure the exposure on each run of siding – most vinyl siding and clapboard cedar siding will have a 4″ exposure, so 3 rows will equal 1 foot. Add everything up, and don’t forget to add the width of the rake-board / fascia board to the total roof rise. Once you plug in the roof rise into the calculator, it will automatically calculate the roof pitch.
You will still need to click the “Calculate Roof Pitch” button to get the rest of the results. For more information on how to calculate roof slope and measure your roof, see the Roof Pitch guide over at Roof Pitch Calculator site. Also do not forget to use utmost caution and safety if you decide to get on the ladder and measure your roof. We also recommend that you use fall protection at all times, if you will go on the roof itself.
Limitations of this roof pitch calculator:
The Roof Pitch Calculator is designed to calculate the roof pitch and roof size for Gable roof only, and the one that has a rectangular shape. It will be some time until we develop a calculator that would be able to include cut up roofs with dormers, valleys, hips, and different roof slopes.
Another limitation has to do with the approximate roof installation pricing – we will include only the 30 years dimensional shingles for now, and the price would not include things like multiple skylight flashing, chimneys, plywood replacement, 2 or more layer tear-off, etc.
The roof installation prices that you will see are for a simple gable roof with one layer tear-off, one chimney flashing, a few vent pipe boots, aluminum drip edge, ice and water shield, and a ridge vent installation. For a more detailed roofing price estimate, use our main roof calculator, which allows for a much more detailed roof pricing, as well as a number of options which you can change to get the most accurate roof price.
Future roof pitch calculator development:
We plan to improve the current features and add new ones as we continue our work to bring you the most comprehensive, and easy to use set of roofing calculators. Right now we are also working on a Roofing Materials Calculator, which will help you not only calculate the roof pitch, roof size for Gable, Hip and even Mansard roofs (including the flat roof portion of the mansard type building).We will also provide you with the list of roofing materials needed to install that roof, as well as the prices.
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How to measure a roof - easy guide to calculate roof size.
30 Nov 10 at 5:29 pm
nice diagram, hope you put more effort into your research on roof pricing structure !!!
salvatore
12 Feb 11 at 7:54 pm
I think your calculator is awsome, but I can’t get the sq ft area to come out right. the roof is 26′ at the base and 26′ long, the rise is 8′. so each side of the roof is 16×26 for a total of 832 sq ft, but your calculator comes up with 1001.75 sq ft. what am I doing wrong?
Thank you, Ken
Kenneth J Pina Sr.
27 Apr 11 at 2:01 pm
Hi Ken,
You are correct – I manually checked the numbers – with calculator and Pythagorean theorem, and the size does come to just about 800 sq. ft. I will go ahead and beat up my programmer, and not feed him for 3 months
Actually using the pure math, with 8′ roof rise (7.38 roof pitch), the gable side comes to just about 15.25′ – not 16.
We will fix this soon, as well as do other improvements – make this roof pitch calculator more usable overall. We’ll do this just a soon as we finish developing Roofing Calculator iPhone app … and we will make sure thing like this do not pop into the app.
Leo - roofer with a vision
27 Apr 11 at 3:56 pm
hi: This is Ken if I “include the overhang” on the gable end measurement the pitch comes out to 7.38 in 12 but I think it should be 8 I plan to build a cottage 24×24 feet, gable is 8 feet high with an overhang of 1 foot on sides and ends, I would like to have an 8/12 pitch, Please advise.
Kenneth J Pina Sr.
28 Apr 11 at 1:46 pm
THIS IS THE BEST SITE FOR ROOFING INFORMATION.
THANK YOU FOR ALL THE INFORMATION
ALL IS GREAT.
luis garcia
13 May 11 at 6:16 am
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Roof pitch - how to measure and calculate roof slope
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