The short version
- Your measurements stay on your device. Every calculator is plain HTML, CSS and JavaScript that runs in your browser. The numbers you type are not transmitted to us and are not stored by us.
- No cookies, no tracking, no consent banner. This site sets no cookies, sells nothing and profiles nobody. The only things loaded from outside the site are two cookieless analytics services — Cloudflare Web Analytics and PostHog — described under Analytics and advertising below; neither can identify you and neither sees what you type into a calculator. Fonts and images are served from this site.
- No account, no newsletter, no profiling. There is nothing to sign up for and nothing about you to hold.
- Contact is by email only, and only if you choose to write to us. See contact.
This policy uses the terms of the UK GDPR and the Data Protection Act 2018. It is written to describe what this site genuinely does, not what a template says a site usually does.
What the calculators do with your input
Nothing leaves your browser. When you type measurements into a calculator, the JavaScript in the page works out the result on your own device. There is no server round-trip, no form submission and no API call — you can confirm this yourself by loading any calculator and watching the page work with your network connection switched off. Because no personal data is sent anywhere by the calculators, there is no processing of your measurements for us to describe, and no lawful basis is needed for it.
What the site itself may record
We do not collect personal data through this website. There are two exceptions worth stating honestly. First, as with any website, the web server that delivers these pages will normally keep a standard access log recording things like the IP address that made a request, the page requested and the time — those logs are generated by the hosting itself, are used for keeping the site running and secure, and are not used by us to identify individual visitors, build profiles or for marketing. Second, the cookieless analytics services described under Analytics and advertising receive the same request metadata any page load sends, but they store no identifier for you and cannot tell who you are.
We do not use that information to contact you and we do not combine it with anything else.
Cookies
This site sets no cookies of its own, and there is no cookie banner here because there is nothing to consent to. The visit counter described below is deliberately cookieless: it puts no identifier on your device and does not follow you between sites. If that ever changes — a cookie-setting service, or any non-essential cookie — this page will say so plainly and those cookies will only be set with your consent, as the UK rules require.
Analytics and advertising
This site uses Cloudflare Web Analytics, a cookieless visit counter, and PostHog, a cookieless product-analytics tool. It records page views, the referring site, approximate country and device type, so we can tell whether the site is being found and used. It sets no cookies, does not fingerprint your device and does not build a profile of you. Nothing you type into a calculator is sent to it — the counter sees which page loaded, never what you entered. It is used for statistics only, which is why there is still no consent banner; the lawful basis for the small amount of technical data involved is our legitimate interest in understanding how the site is used (UK GDPR Article 6(1)(f)).
PostHog records page views and anonymous interaction events — which pages and calculators are opened and which buttons are clicked — so we can see which tools are actually useful. It runs in cookieless mode: data is kept in memory only, no cookie is set, and no identifier is stored that could follow you between visits or identify you. It does not record the numbers you type into a calculator. No advertising network receives the data. The lawful basis is again our legitimate interest in understanding how the site is used (UK GDPR Article 6(1)(f)).
There is no advertising on this site, no behavioural or advertising networks are used, and no data is shared with anyone for marketing purposes.
Affiliate and price-comparison links
There are currently no live affiliate or price-comparison links on this site: the merchant names you may see on a calculator page are plain text, not links. If tracked links are added in future, clicking one would take you to a retailer's website, and that retailer may then set its own cookies or process your data under its own privacy policy, which we do not control. The affiliate disclosure explains how those links would be marked. Any change to how links work will be reflected here before it happens.
Contacting us, and what happens to your message
The only way to send us personal data is to email us, and only if you choose to. If you do, we will hold your message and your email address for as long as it takes to deal with your query, and then for a reasonable period afterwards in case you reply. We will not add you to any list, and we will not pass your details to anyone else. See the contact page for how to get in touch.
Your rights
Under the UK GDPR you have the right to:
- be told what personal data we hold about you and to ask for a copy of it (a subject access request);
- have inaccurate data corrected;
- ask us to erase data we hold about you;
- object to, or ask us to restrict, certain processing;
- complain to the Information Commissioner's Office (ICO) if you believe your data has been handled improperly.
In practice, because this site collects no personal data through the calculators, the only data we could hold about you is an email you have chosen to send us. Requests can be made using the route on the contact page. The ICO is the UK's independent data protection regulator and can be reached at ico.org.uk.
Who is responsible for your data
The data controller for this site is Projectcalc, which operates projectcalc.co.uk. You can reach the controller through the contact page.
Changes to this policy
If what the site does changes — the first live affiliate link, a change of analytics provider, the first third-party embed — this page will be updated to describe the new position accurately and truthfully at the same time, and the date below will change. The cookieless analytics were added on 25 September 2026 (Cloudflare Web Analytics) and 1 October 2026 (PostHog), and are described above.
Last updated: 1 October 2026.