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The 'X' in an X/12 roof pitch — how many inches the roof rises over 12 in of horizontal run.
A '6/12' roof is a common moderate pitch; roofs are conventionally specified this way regardless of whether you use metric elsewhere, since it's a fixed North American roofing convention.
Roof angle
26.57 degrees
- Slope percent
- 50 %
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Roof Pitch to Angle Calculator: 26.57 degrees — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Roofing pitch is conventionally expressed as rise per 12 in of run (e.g. '6/12'); angle in degrees = arctangent(rise / 12)
Inputs used
- Rise per 12 in of Run
- 6
Intermediate steps
- Slope percent
- 50 %
What this calculation does not cover
- The angle is the slope of the plane and carries no height with it. How far the ridge actually stands above the plate comes from the run — half the span on a symmetrical gable — times the rise per foot, so a given pitch puts four times the ridge height over a span four times as wide. Choose a pitch on the angle alone and the ridge can land above a planning height limit, below an existing eaves line, or with an attic room that has no headroom in it.
- Pitch is a load case before it is a geometry. Snow standards hold the full design snow on the roof until the slope passes a threshold — around 30 degrees on a shingled surface that snow will not slide off — and reduce it only above that, while wind on the windward plane swings from suction toward positive pressure as the roof steepens. Changing a pitch is a rafter, tie and hold-down question, not just a change in covering quantity.
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This result is a specification — 26.57 degrees — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Roofing pitch is conventionally expressed as rise per 12 in of run (e.g. '6/12'); angle in degrees = arctangent(rise / 12)
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