Privacy policy
This page explains what Mr. Calco (mrcalco.com) does with information when you use our free online calculators. We do not ask you to create an account, and the numbers you type into calculators stay in your browser unless you choose to share a page yourself.
Who we are
Mr. Calco is a free calculator website at https://mrcalco.com. We publish practical tools with clear explanations in many languages. This policy covers the website and our embeddable calculator widgets.
What we do not collect
- We do not require registration or a password.
- We do not store the numbers you type into calculators on our servers.
- We do not sell personal information.
Information stored in your browser
Some preferences stay on your device so the site works the way you left it:
You can clear these anytime in your browser settings. Clearing site data resets preferences and favorites.
- Language choice (cookie and local storage key mrcalco_lang)
- Light or dark theme (local storage key theme)
- Favorite calculators (local storage key mrcalco_favorites_v1)
- Metric or imperial units preference (local storage key calchub-units)
Cookies
We set a language preference cookie (mrcalco_lang) so we can show the site in your chosen language on later visits. It lasts about one year and is not used for advertising. Google Analytics may also set its own cookies — see below.
Analytics
We use Google Analytics 4 to understand how people use the site in aggregate — for example which pages are popular and whether embeds are used. The script loads after the page is idle so it does not block the calculator. Google may process data outside your country under its own terms. You can limit analytics with browser settings, privacy extensions, or Google’s opt-out tools.
Why we process this data
- Language cookie and local preferences — to remember settings you chose.
- Analytics — to improve the site and keep content useful (legitimate interest; where local law requires consent for analytics cookies, we rely on that framework instead).
- Standard web server logs on hosting — to deliver pages securely and diagnose outages.
How long data is kept
Browser preferences remain until you clear them. Analytics retention follows our Google Analytics configuration and Google’s policies. We do not keep calculator form values on our servers.
Sharing
We do not sell your data. Analytics data is processed by Google as our analytics provider. Website hosting may process routine technical logs (such as IP address, user agent, and requested URL) needed to serve pages.
Your choices and rights
Depending on where you live — for example under the GDPR, UK GDPR, or similar laws — you may have rights to access, correct, delete, or restrict certain personal data, and to object to some processing. You can also:
For privacy questions about this site, contact Mr. Calco through https://mrcalco.com and mention “Privacy” in your message.
- Clear cookies and site storage in your browser
- Change or reset language, theme, units, and favorites on the site
- Use browser or operating-system controls that limit tracking
Children
The site is a general-audience calculator resource. We do not knowingly collect personal information from children to create marketing profiles or accounts.
Changes to this policy
We may update this policy when our practices or the law change. The “last reviewed” date below shows when we last checked it. The revised policy applies to later visits after it is published.