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The pitch of a roof is an important factor in figuring out how much roofing material will be needed when installing a new roof, because it allows you to accurately calculate the surface area of the roof (see How to Find the Area of a Roof).
A very thorough roof pitch factor chart, along with an explanation of the roof pitch factor and the formula so you can calculate slope factors yourself.
Our chart shows the code-required minimum roof pitch for every roofing material. Minimum roof slope for asphalt shingles, metal panels, EPDM, etc.
Slope conversion calculators, charts, formulas, and examples for converting roof slopes in standard roof pitch to roof angle in degrees & vice versa.
We explain roof pitch multipliers and include a large roof pitch multiplier chart. Includes the formula so you can calculate slope multipliers yourself.
Calculate roof surface areas with our Roof Area Calculator. Add multiple roof sections with different slopes. Good for homeowners and professionals.
Want to calculate the surface area of a roof? Learn how to use the roof pitch multiplier and the roof's footprint to accurately figure out total roof area.
This table gives the hip and valley factor (or multiplier) for a full range of roof pitches, as well as the equation for calculating the factor.
The following table shows how the same common roof slopes can be expressed using rise-in-run ratios (standard pitch), degrees, and percentages. See below, after the table, for directions on how to convert any one way to express roof slope to another. Even roof slopes not shown in the table. It’s just a little math.
Measure a roof using satellite images for free with Google Earth. Step-by-step directions for measuring roof areas and distances. With screenshots!