About CalculateRoofPitch
CalculateRoofPitch is an independent reference site for roof pitch math, roofing-material decisions, and residential framing calculations. We exist for one reason — to give homeowners, DIY builders, junior contractors, and architecture students a fast, accurate, ad-free place to settle the kinds of questions that come up on every roofing project: what pitch is this roof, what does that mean for materials, what will it cost, and what does the code actually say.
What we publish
We maintain three things in one place — a free roof pitch calculator with five calculation modes, a reference library covering every common pitch from 1/12 to 24/12 along with standard residential roofing materials and applicable IRC and IBC code provisions, and a suite of specialized calculators for the related decisions a roofing project pulls in (rafter length, sheathing area, siding, wall studs, hip-roof area, LVL beams, and roof replacement cost).
The site is built and maintained as a small, focused publication. We are not a roofing contractor, not a manufacturer, and not affiliated with any roofing brand. We do not sell roofing services, and our calculators do not change their results based on which brand or product you might be considering.
How we work
Every page on this site goes through the same four-step process before publication, and every page is reviewed against the same checks on a documented cycle.
1. We source the math against primary references
Every formula on this site traces to one of three places — the 2024 International Residential Code (IRC), manufacturer technical bulletins for specific products, or accepted trigonometric identity. We don't publish numbers we can't cite. When we cite the IRC, we cite by section (R905.1.1 for asphalt-shingle minimum pitch, R905.10 for metal panels, and so on) so you can verify against the edition adopted in your jurisdiction.
2. We cross-check against multiple sources
Where the IRC is silent — for example, on regional cost variation — we triangulate. Construction-cost ranges on this site reflect RSMeans national averages, NAHB regional cost surveys, and direct conversations with practising contractors in different markets. Where sources disagree, we publish the range and flag the disagreement rather than picking a single number.
3. We review when the underlying source changes
When the IRC publishes a new edition, when major manufacturers revise pitch minimums or installation requirements, or when material costs move materially in published construction-cost indexes, the affected pages are reviewed and the "last reviewed" date is updated to reflect the check. The full review schedule and source list is on our methodology page.
4. We defer to qualified professionals on engineered design
This site teaches you how to read your roof and plan your project. It does not replace a licensed structural engineer or a contractor familiar with your local conditions. Every page that touches a structural decision says so explicitly, and our calculators include the same caveat in their results. The math on this site is correct; turning that math into a code-compliant building requires professional judgment about your specific site, climate, and any local code amendments.
Why trust this site
Three commitments we make, and the reasoning behind each:
No sponsored content, no paid placement
No roofing manufacturer, distributor, or contractor pays to be recommended on this site. No result on the calculator changes based on which brand you might buy from. When we name a specific product as a good fit for a use case, we name it because it fits — never because we were paid to mention it.
Affiliate transparency
Where a product recommendation is paired with an affiliate link, the link is disclosed inline at the point of recommendation, not buried in a footer. As of the last review date below, we are not running an affiliate programme; if that changes, you'll see disclosed links and a clear notice on the affected pages.
No invented authority
We don't claim credentials we don't have. The math and code references on this site are checked against published sources you can verify, the practical guidance reflects how working roofers do the work, and where a question requires more authority than we can provide we say so and point you to a licensed pro. If you spot a claim on this site that doesn't hold up under scrutiny, please tell us — we treat that as a correction priority.
The team
CalculateRoofPitch is produced by a small editorial team focused on construction reference content. Our role is to source, write, fact-check, and update every page against authoritative primary sources. We are not a single-author site, and we don't pretend to be — content authored by the editorial team is marked as such on every page, and the "reviewed by" byline at the bottom of each long-form article reflects the actual review process described above.
Our review process and sourcing standard is documented in detail on the methodology page.
Get in touch
Found a math error, a stale code reference, or an out-of-date price? We want to fix it. Email us at editor@calculateroofpitch.com with the page URL and the issue. Substantive corrections (math, code citations, material specs) are typically published within a week and noted in the affected page's revision history. Minor copyediting fixes are applied silently.
For broader feedback, partnership inquiries, or media questions, the same address reaches us. We don't accept guest posts or sponsored articles. See our contact page for the full list of addresses and what each is for.
What this site is not
This is a reference and educational publication. It is not engineered design, not an inspection report, not a building permit substitute, and not a replacement for a licensed contractor or engineer familiar with your specific project. Any structural alteration, long-span design, or unusual site condition needs a qualified professional involved. Our calculators and guides exist to help you understand what's involved and ask the right questions, not to substitute for a stamp on a drawing.
Last reviewed May 2026 by the CalculateRoofPitch editorial team. Site operated by CalculateRoofPitch (the publication identified by this domain). Correspondence via the email address above.