Legal

Terms of Service

Last updated: October 2026

Your use of pctzen.com (the "Site") is governed by the terms below. By continuing to use the Site you agree to them.

PctZen does one thing — as a percentage calculator it answers percent-of, what-percent, and percent-change questions instantly, with a discount and tip mode. It picks the right rearrangement of the percentage relationship for the question you ask — part over whole, or the difference over the original — so the same tool covers a markup and a discount without the sign confusion. What follows concerns only that tool and the inputs involved in it.

Everything the tool works with — the numbers you enter — is handled locally. It is usually reached for things like checking a percentage change between two figures, and because nothing is transmitted a visitor can close the tab knowing no copy was made anywhere.

What this Site does

PctZen offers a percentage calculator, free to use, together with supporting explanations. Every result is an estimate computed from what you supply, following the method set out on the page itself. Results are offered for general information and convenience, and anything that matters should be verified independently.

No advice relationship

Nothing here forms a client, advisory or fiduciary relationship. The Site is a tool, and how you act on its output is a matter for you.

The law that governs these terms

Applicable law is that of the operator's jurisdiction, regardless of conflict-of-law provisions.

When accuracy matters

Results are provided for general use and carry no guarantee. For anything consequential, verify the figure separately before relying on it.

Accuracy

We aim for correctness and document the method behind the tool. We do not warrant that every result is free of error, or that the content is complete or current. Where a method carries a recognized margin of error, the result should be read as an estimate.

Permitted and prohibited use

You are free to use the Site for your own purposes, business included. Prohibited: attacking or overloading it, scraping at a rate that harms service, misrepresenting it as yours, and any illegal use.

Copyright and ownership

The design, text and code of the Site belong to us or are licensed to us, except where credited otherwise. You may link to any page. Reproducing substantial parts of the content requires written permission.

Ads and external links

Advertising from third parties supports the Site, and external links may appear for reference. We are not responsible for what those third parties do. Ads never change a result.

Availability

There is no uptime promise: tools and pages may be altered, suspended or withdrawn without notice, and the Site is offered as it stands.

Liability

To the fullest extent permitted by law we are not liable for indirect or consequential loss, or for any decision taken in reliance on a result from the Site.

Contact

If anything here needs clarifying, use the contact page.