Terms of Service

These terms cover using chairkey.com: the six calculators, the blog, the learn section, and the museum. Using the site means you agree to them.

What ChairKey Is

ChairKey is an independent, ad-supported reference site about office and ergonomic chairs and healthy seating. It is not a chair retailer, not affiliated with any chair or furniture manufacturer, and not a medical or occupational-health provider. The Seat Height Calculator, Desk Height Calculator, Monitor Distance Calculator, Chair Weight Capacity Checker, Sit-Stand Calculator, and Posture Angle Checker are free, browser-based tools built on common ergonomic conventions and the numbers you enter.

Using the Tools

No account, sign-up, or payment is required to use any calculator. Inputs you type into a tool are processed in your browser to produce an estimate; see the Privacy Policyfor what does and doesn’t leave your device. Results are general guidance based on standard formulas and rules of thumb, not a measurement of your specific body, chair, or workspace by a professional.

Not Medical or Professional Advice

Nothing on ChairKey is medical, physiotherapy, or occupational-health advice. If you’re dealing with pain, an injury, or a medical condition, talk to a doctor, physiotherapist, or certified ergonomist before changing your setup based on a calculator result. The full reasoning behind this is in the Disclaimer.

Acceptable Use

When using the site, you agree not to:

• Automate requests against the tools at a volume that degrades the site for other visitors
• Scrape, republish, or resell the site’s content or tool logic wholesale
• Attempt to bypass, disrupt, or probe the site’s security
• Submit deliberately false information through the contact or subscribe forms
• Use the site for any unlawful purpose

Content & Ownership

ChairKey’s own text, calculator design, and site design belong to ChairKey. The museum and learn sections draw their entries, images, and facts from Wikipedia and Wikimedia Commons, used under their respective public-domain and Creative Commons licenses — that content belongs to its original contributors, not to ChairKey.

Ads & Affiliate Links

The site carries Google AdSense advertising and, on some tool and article pages, Amazon affiliate links. Both are disclosed in full in the Affiliate Disclosure. Ads and product links are served by third parties and are not endorsements by ChairKey.

No Warranty

The site, its tools, and its content are provided “as is,” without warranties of any kind, express or implied, including accuracy, fitness for a particular purpose, or uninterrupted availability. We try to keep the calculators correct and the guides current, but we don’t guarantee either.

Limitation of Liability

To the extent permitted by law, ChairKey isn’t liable for damages arising from your use of, or inability to use, the site or its tools, including decisions made based on a calculator result or an article.

Changes to These Terms

These Terms may be updated from time to time; the date above reflects the most recent revision. Continuing to use the site after a change means you accept the updated Terms.

Governing Law

These Terms are governed by the laws of the United States, without regard to conflict-of-laws principles.

Contact

Questions about these Terms: email support@chairkey.com or use the contact page.