Contact Gutter Calculator

Include the exact inputs: the roof footprint and pitch you entered, the rainfall preset or in/hr value, the run lengths and corner counts, and the result you expected versus the one shown. Add a screenshot of your calculator inputs. That one message usually lets us reproduce and explain the difference in a single reply.

Not yet. Email lets us re-run the full calculation and verify every answer against the published capacity tables, the IPC 1106 wall-area treatment, and IRC / FBC fastening practice before responding — which matters when the topic is a system that has to shed a real storm. We read every message and answer most within two business days.

We can tell you what the calculator's method says for the inputs you enter — and show every formula behind it, including the pitch correction and the capacity basis. But a real roofline has real conditions: valleys that concentrate flow, fascia condition, overhang width, and the installer's own practice are the ground truth. Treat the computed value as the strong hypothesis and confirm it on the eave before you buy.

Installers quote from habit and local practice — a 5" K-style on most homes, one spout per corner — and for most houses that habit is right. Two quotes for the same roof can differ by a profile size and both be correct for the assumptions each made. Compare the design rainfall and the run geometry behind each number before comparing final prices — the discrepancy is almost always in the assumptions, not the arithmetic.

No. The site sells nothing, carries no affiliate links to any manufacturer, supplier, or marketplace, and is not affiliated with any brand. Advertising is clearly labeled and separately handled — see the advertising section of the Privacy Policy for how that works.

Please do — that is how the toolset grows. Send the problem you were trying to solve, the roofline you were working with, and what you wished had been calculated for you. Requests that describe a real eave or a real quote (e.g., 'can you account for a valley dumping into one run?') go to the top of the content queue.

Only for as long as your thread is open. Whatever you include — inputs, screenshots, the result you expected — is used to reproduce the calculation and fix whatever you reported, then it is deleted. Your address is never added to a mailing list, because there is no mailing list, and nothing you send is shared with third parties.

Yes — that is planning use, and it is what the tools are for. Run your own inputs, treat the output as your working figure, and verify it against the site conditions and your own review before committing. What you may not do is present the output as a code-compliance document or a stamped engineering design — the Disclaimer covers the line in detail.