Privacy policy

We wrote this policy to explain, without legal padding, how Concrete Calculator treats information about the people who use the concrete calculator on calculator-concrete.org. It covers the tool itself, the guides and every other page on calculator-concrete.org.

Who runs this site

Concrete Calculator is a free online concrete calculator published at calculator-concrete.org. The operator of the site is responsible for your information, and the quickest way to reach them is by email at [email protected]. Where data protection law uses the term “controller”, it refers to this operator.

The data involved

There are no user accounts on calculator-concrete.org, so we never ask for your name, a password or payment details. Whatever you enter into the concrete calculator is handled by your browser itself; it is not transmitted to us or stored on our server. Below we list the technical data that is collected through server logs, analytics and advertising, and why.

Your inputs and your device

The concrete calculator remembers your recent inputs and settings using your browser's local storage. This data stays on your device; it is not sent to calculator-concrete.org and we cannot see it. You can delete it at any time by clearing this site's data in your browser settings; a private window keeps nothing once it is closed.

Cookies and tracking technologies

A cookie is a small piece of data that a site, or a service used by the site, stores in your browser, and similar technologies include pixels and local storage. The cookies in use on calculator-concrete.org belong to the analytics and advertising services covered in the next sections, not to the tool itself. If you block cookies, the site still works; you may simply see less relevant ads.

Analytics

Two analytics tools run on the site: Yandex Metrica, provided by Yandex, and Microsoft Clarity, provided by Microsoft. The data they gather includes pages viewed, visit length, referrer, browser and device details and a coarse location derived from your IP address. Their session replays and heatmaps show how people click, scroll and move through a page, which helps us fix usability problems.

Yandex and Microsoft process this information under their own privacy policies, published on their websites. We use these reports to improve the site, not to identify you.

Web server logs

Like nearly every website, the server that hosts calculator-concrete.org keeps standard access logs. They show which page was requested, when, from which IP address and with which browser (the user agent). Their purpose is security, error diagnosis and aggregate statistics.

Advertising

We show advertising on calculator-concrete.org to cover the cost of running the site. The ads are supplied by third-party ad networks, which may set cookies and use device data, such as your IP address and browser details, to choose ads and measure how they perform. Depending on your settings and location, the ads you see may be personalised based on your activity on other websites. Ad networks receive nothing you type into the tool; what they do collect is governed by their own privacy policies. You can opt out of personalised ads from many networks at optout.aboutads.info and youronlinechoices.eu, and you can block third-party cookies in your browser.

Legal grounds under the GDPR

For visitors in the EEA and the UK, the legal bases are:

• Consent where the law requires it for analytics and advertising technologies.
• Legitimate interests in running a secure, working, ad-funded website, weighed against your rights.
• Your request: local storage is used only to provide the feature you are using.
• Correspondence: emails you send are used only to respond to you.

Retention

We keep information only as long as it is needed: server logs are deleted on a rolling basis after a limited period, unless an entry is needed to investigate an attack or abuse. Emails you send us are kept as long as needed to deal with your message and any follow-up. Analytics and advertising providers keep data according to their own retention schedules. Local storage keeps your entries until you clear the site's data.

Where data is processed

The services we use, including hosting, analytics and advertising providers, may process data in countries other than your own. The level of legal protection there may differ from that of your home country.

Your choices and rights

Data protection law in many places gives you rights over your data: access, correction, erasure, restriction, portability and the right to object. Consent you have given can be withdrawn whenever you like. Since the site has no user accounts, we can usually find data about you only if you give us details like your IP address and the time of your visit.

You also have the right to lodge a complaint with a data protection supervisory authority, in particular where you live or work. Requests can be sent to [email protected].

California (CCPA/CPRA)

Under California law (the CCPA as amended by the CPRA), you may request to know and to delete or correct personal information about you, and you may opt out of its sale or sharing. We do not sell personal information in the ordinary sense, and visitor data is not exchanged for payment.

Advertising cookies, though, can amount to “sharing” for cross-context behavioural advertising as California law defines it. You can opt out by turning on the Global Privacy Control signal in your browser, blocking third-party cookies, or contacting us. Using these rights will not change how the site works for you.

Keeping data safe

The site is served over HTTPS, so traffic between your browser and calculator-concrete.org is encrypted. Server access is restricted to the site's operator. No system is perfectly secure; still, your tool inputs stay on your device.

Children's privacy

The site is meant for a general audience and is not aimed at children under 13 (under 16 in the EEA and UK). No personal information is knowingly collected from children. If a child has given us personal information, for instance in an email, please let us know so that we can delete it.

When this page changes

We update this page when our practices change, for example when we add or remove a service. The text on this page is the version in force.

Questions

Questions about this policy and privacy requests can be sent to [email protected]. We answer privacy requests within the time limits that apply under data protection law.