Legal
Privacy Policy
Last updated: October 26, 2026
This Privacy Policy explains what information MyCalcsWorld (“we”, “us”, “the site”) handles when you visit mycalcsworld.com and use our free online calculators. We try to collect as little as possible. You do not need an account, and the numbers you type into a calculator are processed in your browser.
1. Who we are
MyCalcsWorld is an independent project. For the purposes of data protection law, we are the controller of the limited information described below. You can reach us at mycalcsworldcontact
2. What we do not collect
We do not offer user accounts, logins, comments, or payments, so we do not ask for your name, address, phone number, or payment details. Calculator inputs and results are computed locally in your browser and are not sent to our servers or saved in a database. If you contact us by email, we receive the address and message you choose to send, and we use it only to reply.
3. Information stored on your device
To make the site convenient, some preferences are saved in your browser’s localStorage. This data never leaves your device through our code, and you can erase it at any time by clearing site data in your browser settings. It includes:
- Your recently used calculators, favorites, and any scenarios you choose to save.
- The last inputs you entered for a calculator, so you can pick up where you left off.
- Short result summaries shown in the “Continue” area of the home page.
- Your theme (light or dark), selected display currency, and install-prompt state.
- Your cookie choices (key
mcw-consent).
4. Hosting and server logs
The site is hosted on Vercel. Like almost every web host, Vercel and our content delivery network process technical request data such as your IP address, browser type, requested URL, and timestamp to deliver pages, prevent abuse, and keep the service secure. We use your approximate country (derived from your IP address at the edge) only to decide whether to ask for cookie consent before loading analytics and advertising; we store a single “region” flag (mcw_region) in a cookie for up to 24 hours and not the country itself.
5. Analytics
We use Google Analytics 4 (measurement ID G-Q3KLWD6CME) to understand which pages are useful, how visitors find the site, and which devices and browsers we should support. Google Analytics uses cookies and similar identifiers to produce aggregated statistics, and we have IP anonymization enabled. We also use Vercel Web Analytics, which measures page views without cookies and without building a profile of individual visitors. We do not combine analytics data with any information that identifies you personally. Where you are in the EEA, the United Kingdom, or Switzerland (or we cannot tell), Google Analytics only loads after you accept cookies in the banner.
6. Advertising and third-party vendors (Google AdSense)
We may show ads through Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on a user’s prior visits to this website or other websites. Google’s use of advertising cookies enables it and its partners to serve ads to you based on your visit to our site and/or other sites on the Internet. Google uses the DoubleClick (DART) cookie, among others, to show ads and to measure their performance.
You can choose how these cookies are used:
- Opt out of personalised advertising by visiting Google Ads Settings.
- Opt out of many third-party vendors’ use of cookies for personalised advertising at aboutads.info (US) or youronlinechoices.com (Europe).
- Read how Google uses information from sites or apps that use its services at policies.google.com/technologies/partner-sites, and Google’s Privacy Policy.
- Use the “Reject non-essential” option in our cookie banner; ads, if shown, are then requested without personalisation and without advertising cookies where Google’s consent signals allow.
We do not control the cookies set by Google or other advertisers and cannot read them. Each vendor’s own privacy policy governs how it handles your data. Ads are labelled and kept apart from calculator results.
7. Cookies explained
Cookies are small text files stored by your browser. We use three kinds. Essential storage (theme, saved calculators, your cookie choice, and the region flag) is needed for the site to work as you expect. Analytics cookies from Google Analytics count visits and measure performance. Advertising cookies from Google and its partners help serve and measure ads. We implement Google Consent Mode v2: until you choose, analytics and advertising storage is denied for visitors in the EEA, UK and Switzerland, and your choice updates those signals immediately. You can change your mind at any time:
You can also block or delete cookies in your browser settings; the calculators keep working, though some conveniences (like remembered inputs) may be lost.
8. Third-party services and links
Some tools fetch public reference data, such as delayed currency or metal rates, from third-party providers. Those requests come from your browser and expose your IP address to the provider, which handles it under its own terms. Our pages may link to external websites. We are not responsible for their content or privacy practices, so please read their policies.
9. Legal bases and your rights (EEA, UK, Switzerland)
If you are in the European Economic Area, the United Kingdom, or Switzerland, we process data on these legal bases: your consent (analytics and advertising cookies), and our legitimate interest in running a secure, working website (hosting logs and essential storage). You have the right to access the personal data we hold about you, ask us to correct or erase it, restrict or object to processing, receive it in a portable format, and withdraw consent at any time without affecting earlier processing. You may also lodge a complaint with your local data protection authority. To exercise these rights, email us; because we hold almost no personal data, we will usually be able to confirm only the emails you sent us.
10. Your rights in California and other US states (CCPA / CPRA)
California residents (and residents of other US states with similar laws) may ask what personal information we collect, request deletion or correction, and opt out of the “sale” or “sharing” of personal information for cross-context behavioural advertising. We do not sell personal information for money. Advertising cookies served by Google may count as “sharing” under some state laws; you can opt out by choosing “Reject non-essential”, through the links in section 6, or by using a browser setting such as Global Privacy Control. We will not discriminate against you for exercising your rights.
11. Children
MyCalcsWorld is a general-audience site and is not directed at children under 13 (or under 16 where local law sets a higher age). We do not knowingly collect personal information from children. If you believe a child has sent us personal information, contact us and we will delete it.
12. Data retention
Data stored on your device stays there until you clear it. The region cookie expires after 24 hours. Google Analytics data is kept for the retention period configured in our Analytics property and then deleted automatically. Hosting logs are kept by Vercel for the period set in its own policy. Emails you send us are kept only as long as needed to answer you and keep a record of corrections.
13. Security
The site is served over HTTPS. No method of transmission or storage is perfectly secure, but because we collect so little, the amount of data at risk is small.
14. Changes to this policy
We may update this policy as the site or the law changes. The “Last updated” date at the top shows the latest revision; material changes will be reflected there. Using the site after a change means you accept the updated policy.
15. Contact
Questions or requests about privacy? Email mycalcsworldcontact