Gutter Slope Calculator Open Calculator
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Terms of Service

Last updated: June 7, 2026

These Terms of Service ("Terms") govern your access to and use of Gutter Slope Calculator ("we", "our", "us", or the "Service"), available at https://gutterslopecalculator.com. Please read them carefully. By accessing or using the Service, you agree to be bound by these Terms.

If you do not agree with any part of these Terms, you must not use the Service.

1. Acceptance of Terms

By accessing, browsing, or using any calculator or page on Gutter Slope Calculator, you confirm that you have read, understood, and agree to be bound by these Terms and our Privacy Policy. These Terms apply to all visitors, including homeowners, DIY users, contractors, builders, and other construction professionals.

You must be at least 13 years of age (or 16 in the European Economic Area) to use the Service. By using it, you represent that you meet this requirement.

2. Description of the Service

Gutter Slope Calculator is a free, browser-based suite of tools for planning and checking rainwater gutter drainage. The Service includes, among others:

  • Gutter slope, fall, and pitch calculators (US, UK, Australia, and New Zealand variants)
  • Box gutter fall, seamless gutter slope, and roof gutter fall calculators
  • Gutter angle, flow, spread, and slope-per-foot calculators
  • Interactive diagrams, reference tables, and educational content

All calculations run locally in your browser. The Service is provided free of charge for both personal and professional planning use.

3. The Service Provides Estimates Only

The figures produced by Gutter Slope Calculator — including slope, pitch, drop, fall, run length, flow capacity, outlet counts, and angle — are estimates and planning aids only. They are based on standard formulas and commonly cited industry rules of thumb (such as a 1/4-inch-per-10-foot minimum, or a 1:200 box gutter fall).

Actual requirements for any specific installation depend on numerous factors the calculator cannot account for, including local rainfall intensity, roof catchment area, gutter and downpipe sizing, building geometry, and site conditions.

4. Not Professional, Engineering, or Building-Code Advice

The Service does not constitute professional engineering, architectural, plumbing, hydraulic-design, construction, or building-code advice, and is not a substitute for the judgment of a qualified professional.

You are solely responsible for:

  • Verifying all measurements, inputs, and results before relying on them;
  • Confirming compliance with applicable building codes and standards — including but not limited to AS/NZS 3500.3, the National Construction Code (NCC), the UK Building Regulations, the New Zealand Building Code (clause E1), and local authority requirements;
  • Following manufacturer specifications and installation guidance for your specific gutter products;
  • Engaging a licensed builder, plumber, roofer, or hydraulic engineer where required.

Always have concealed, internal, valley, and box gutter drainage designed and checked by a qualified professional.

5. Acceptable Use

You agree to use the Service only for lawful purposes and in accordance with these Terms. You agree not to:

  • Use the Service in any way that violates any applicable law or regulation;
  • Attempt to gain unauthorized access to, interfere with, or disrupt the Service, its servers, or networks;
  • Use automated systems (bots, scrapers) to overload or harvest the Service in a manner that degrades performance for others;
  • Reproduce, duplicate, copy, sell, or exploit any portion of the Service for commercial purposes without our express written permission;
  • Introduce malware, or attempt to reverse-engineer the Service for malicious purposes;
  • Misrepresent the Service's output as certified or professionally endorsed.

6. Intellectual Property

All content on the Service — including the design, layout, text, calculators, formulas as implemented, interactive diagrams, code, graphics, and the "Gutter Slope Calculator" name and branding — is owned by Gutter Slope Calculator or its licensors and is protected by copyright, trademark, and other intellectual-property laws.

You are granted a limited, non-exclusive, non-transferable license to access and use the Service for your own personal or professional planning purposes. This license does not permit you to republish, redistribute, or commercially exploit the Service or its content without our written consent.

Underlying mathematical formulas and industry standards referenced by the tools are themselves public knowledge and are not claimed as our property.

7. Disclaimer of Warranties

The Service is provided on an "as is" and "as available" basis, without warranties of any kind, whether express, implied, or statutory. To the fullest extent permitted by law, we disclaim all warranties, including but not limited to implied warranties of merchantability, fitness for a particular purpose, accuracy, and non-infringement.

We do not warrant that:

  • The calculations or output are accurate, complete, reliable, or error-free;
  • The Service will be uninterrupted, secure, or free of bugs or viruses;
  • The Service will meet your specific requirements or be suitable for any particular project.

8. Limitation of Liability

To the fullest extent permitted by applicable law, Gutter Slope Calculator, its operators, and contributors shall not be liable for any direct, indirect, incidental, special, consequential, exemplary, or punitive damages, including but not limited to property damage, water damage, structural damage, financial loss, lost profits, rework costs, or installation errors arising out of or in connection with:

  • Your use of, or inability to use, the Service;
  • Any reliance placed on the Service's calculations or content;
  • Any errors, omissions, or inaccuracies in the output;
  • Any work carried out based on the Service's estimates.

You acknowledge that you use the Service entirely at your own risk and that the responsibility for any gutter installation or drainage work rests with you and your qualified professionals.

9. Indemnification

You agree to indemnify and hold harmless Gutter Slope Calculator and its operators from and against any claims, liabilities, damages, losses, and expenses (including reasonable legal fees) arising out of or in any way connected with your use of the Service, your violation of these Terms, or your violation of any rights of a third party.

10. Third-Party Links

The Service may contain links to third-party websites, standards bodies, or resources that are not owned or controlled by us. We have no control over, and assume no responsibility for, the content, privacy policies, or practices of any third-party sites. Accessing such links is at your own risk.

11. Availability and Changes to the Service

We reserve the right to modify, suspend, add to, or discontinue any part of the Service — including individual calculators or features — at any time, with or without notice. We will not be liable to you or any third party for any modification, suspension, or discontinuation of the Service.

12. Changes to These Terms

We may revise these Terms from time to time. The "Last updated" date at the top of this page reflects the most recent revision. Material changes will be indicated by updating that date. Your continued use of the Service after any change constitutes your acceptance of the revised Terms. We encourage you to review this page periodically.

13. Governing Law

These Terms shall be governed by and construed in accordance with applicable law, without regard to conflict-of-law principles. Any disputes arising under these Terms shall be subject to the exclusive jurisdiction of the competent courts in the jurisdiction in which the Service is operated, except where applicable consumer-protection law grants you the right to bring proceedings in your own jurisdiction.

14. Severability

If any provision of these Terms is found to be unenforceable or invalid, that provision will be limited or eliminated to the minimum extent necessary, and the remaining provisions will remain in full force and effect.

15. Contact Us

If you have any questions about these Terms of Service, please contact us: