The 3 roof pitch calculator tools below will help you calculate roof slope from every possible angle. Each tool below performs a specific operation that involves measuring and calculating roof slope. Using our Roofing Pitch Calculator(s) below, you can calculate roof slope, roof area, rafter length and other roof dimensions, and convert Roof Pitch to Degrees.
1) Calculate Roof Area, Slope & Rafter Length based on Roof Dimensions and Roof Rize:
How to use Roof Pitch and Area Calculator:
To estimate roof area (roof size), enter roof width and length (as shown in the roof measuring diagram below), and either Roof Rise or Roof Pitch – second value will auto-calculate. Click calculate. The results will pop below the calculate button, and will include: Rafter Length, Total Roof Size / Area, and Roof Pitch.
The approximate roof replacement prices above are calculated assuming removal of 1 layer of old roofing shingles, 1 chimney flashing, ridge vent and Ice & Water Shield installation, for both 30 years shingles, and metal roof options. If you want a more accurate roof price estimate, use our Roofing Cost Calculator
Using the diagram below, measure your roof from the ground, and enter roof dimensions into the calculator #2 above. Enter roof span (also known as gable side width), and roof rise above roof base line.
2) Calculate Roof Pitch based on Rafters Length:
|Roof Pitch = / 12″|
2) Convert Roof Pitch to Angle (Degrees) – enter roof pitch in the first box – calculation is automatic.
|Enter Roof Pitch:||/ 12″|
To calculate your roof pitch and roof size, measure your roof and plug in your measurements in accordance with the diagram below. Enter EITHER Roof Rise or Roof Pitch.
Measuring roof rise:
If you do not know roof rise, and do not have a ladder or cannot access your roof in order to measure it, you can accurately estimate roof rise by measuring 3 spans of siding (typical vinyl siding has 4″ exposure, so 3 spans would be equal to 12″ or 1 foot), and calculating the number of spans from roof 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 roof rise.
Example: If you have 19 spans of siding at 4″ exposure (width) of each span, and a 6″ rake board, the roof rise would be:
[6" + (19 * 4")] / 3 = 6′ 10″ roof rise.
Converting roof pitch (US / Canadian roof slope measuring method) to degrees (European slope measuring method) can be useful in figuring out the roof geometry, or for roofers from Europe who are not accustomed to US system. See Table below:
Roof Shingles Calculator – estimate cost of roofing materials, using our tool here.