Question 1

What is a normal roof pitch?

Accepted Answer

Most residential roofs in the US have a pitch between 4/12 and 9/12. A 4/12 pitch (18.4°) is the minimum for standard asphalt shingles. A 6/12 pitch (26.6°) is the most common. Anything above 9/12 (36.9°) is considered a steep roof and requires special safety equipment.

Question 2

How do I measure roof pitch from the ground?

Accepted Answer

Stand back from the house and hold a speed square or pitch gauge app at arm's length, aligning it with the roof slope. Alternatively, measure from inside the attic: place a level horizontally against a rafter, mark 12 inches, then measure the vertical distance from that mark to the rafter — that's your rise per 12 inches of run.

Question 3

What is the pitch multiplier for roofing?

Accepted Answer

The pitch multiplier converts flat (footprint) area to actual roof area. For a 4/12 pitch it's 1.054, for 6/12 it's 1.118, for 8/12 it's 1.202, and for 12/12 it's 1.414. Multiply your footprint square footage by the pitch multiplier to get the actual roof area for ordering materials.

Pitch	Angle	Multiplier	Category	Common Use
1/12	4.8°	1.003	Flat	Commercial, membrane roofing
2/12	9.5°	1.014	Low slope	Standing seam metal, rubber
3/12	14.0°	1.031	Low slope	Minimum for most shingles
4/12	18.4°	1.054	Standard	Shingles, metal panels
5/12	22.6°	1.083	Standard	Shingles, tile
6/12	26.6°	1.118	Standard	Most common residential
7/12	30.3°	1.158	Standard	Shingles, tile, slate
8/12	33.7°	1.202	Moderate	Shingles, slate, tile
9/12	36.9°	1.250	Steep	Architectural shingles, slate
10/12	39.8°	1.302	Steep	Slate, cedar shake
12/12	45.0°	1.414	Very steep	Victorian, A-frame, decorative

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Common Roof Pitches Reference Table

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Material Multiplier Impact

Labor Cost by Pitch

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