Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Roofing & Exterior
Roof Pitch Calculator — Rise, Run, Angle & Multiplier
Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
Compute pitch, angle degrees, and slope multiplier from rise and run. Planning estimates only — verify measurements and local codes on site.
Inputs
124
624
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Pitch = 6.0/12. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Rise (in)
The “Rise (in)” value used in this tool’s formula. Adjust it to see results update live.
Run (in)
The “Run (in)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Compute pitch, angle degrees, and slope multiplier from rise and run. Planning estimates only — verify measurements and local codes on site. Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run. Example: 6 in rise per 12 in run → 6/12 pitch, ~26.6°, multiplier ~1.118.
Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
Example: 6 in rise per 12 in run → 6/12 pitch, ~26.6°, multiplier ~1.118.
When to use this Roof Pitch Angle
Common use cases
- Compute pitch, angle degrees, and slope multiplier from rise and run.
- Sanity-check with this case: 6 in rise per 12 in run → 6/12 pitch, ~26.6°, multiplier ~1.118.
- The relationship is: Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
Localized examples
- Roofing & Exterior: the example on this page uses the same formula as the widget.
What you get
- Fields: Rise (in), Run (in)
- Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
- Example on the page: 6 in rise per 12 in run → 6/12 pitch, ~26.6°, multiplier ~1.118.
How to Calculate Roof Pitch Angle Step-by-Step
- 1Enter Rise (in), Run (in). Use the values you have, not a catalog average, unless that is all you know.
- 2Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
- 3Worked case: 6 in rise per 12 in run → 6/12 pitch, ~26.6°, multiplier ~1.118.
- 4Buy materials after you walk the job. This is a first-pass quantity, not a purchase order.
Governing formula
Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
6 in rise per 12 in run → 6/12 pitch, ~26.6°, multiplier ~1.118.
Example: set Rise (in) = 6, Run (in) = 12, then read the result.
Variable definitions
- riseIn
Rise (in)
The “Rise (in)” field. Default 6; typical range 1–24.
- runIn
Run (in)
The “Run (in)” field. Default 12; typical range 6–24.
- The takeoff (Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.) ignores waste, code, and what you find when you open the wall. Measure twice on site.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Pitch = rise:run; angle = atan(rise/run); multiplier = √(run² + rise²) ÷ run.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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