Roof Pitch Calculator will instantly estimate your roof slope from every possible angle.
You can calculate slope, area, rafters length and other dimensions. You can also convert roof pitch to Degrees (at the bottom).
1) Calculate Roof Slope Based On Rafters Length
Roof Pitch = / 12″
How To Use Pitch Calculator
To estimate roof area, enter width and length (as shown in the measuring diagram below), and either Rise or Pitch – second value will auto-calculate. Click calculate. The results will pop up below the calculate button, and will include: Rafter Length, Total Size / Area, and Pitch.
Using the diagram below, measure your roof from the ground, and enter building dimensions into the calculator #2 above. Enter the span (also known as gable side width), and the rise above the base line.
To calculate your pitch and size, measure your roof and plug in your measurements in accordance with the diagram below. Enter EITHER Roof Rise or Roof Pitch.
2) Pitch to Angle (Degrees) Calculator
Enter pitch in the first box – calculation is automatic.
|Enter Roof Pitch:||/ 12″|
How To Measure Roof RiseIf you do not know the rise, and do not have a ladder or cannot access your roof in order to measure it, you can accurately estimate the rise by measuring 3 spans of siding.
Typical vinyl siding has 4″ exposure, so 3 spans would be equal to 12″ or 1 foot. Calculate the number of spans from the base line to the peak. Since most homes have a Rake wood, which is usually 6-8″ wide, you can add that width to the rise.
Example: If you have 19 spans of siding at 4″ exposure (width) of each span, and a 6″ rake board, the rise would be:
[6″ + (19 * 4″)] / 3 = 6′ 10″ roof rise.
Converting pitch (US / Canadian slope measuring method) to degrees (European slope measuring method) can be useful in figuring out the roof geometry, or for European contractors who are not accustomed to th eUS system. See Table below:
To learn additional information about why roof pitch is important and different methods of calculating it, refer to our comprehensive Roof Pitch Guide.
To get roof rafters length and accurate replacement cost, use our Rafter Calculator.
If you need to to quickly estimate how much a new roof costs, use our Roof Installation Calculator
To estimate pricing for 3-tab and architectural shingles, use our Asphalt Shingles Calculator
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