Overview
Calculator Matters ("we", "our", or "us") operates calculatormatters.com. We are committed to protecting your privacy, and the site is designed to be privacy-friendly by default: the numbers you enter into a calculator are processed in your browser and are not transmitted to or stored on our servers. This policy explains what limited data is involved when you use the site, how advertising and cookies work, and the rights you have.
Your privacy at a glance
- Your calculator inputs never leave your browser — they are processed locally and never sent to or stored on our servers.
- No account, no sign-in, no password — every calculator is free to use without registering.
- We do not sell your personal information.
- Ads can be made non-personalised — opt-out links are in the advertising section below, and the calculators work the same either way.
- You stay in control — clear your browser storage to remove saved preferences and scenarios, and email us to access or delete a message you sent.
Information we collect
Calculator inputs (not collected): Calculations run client-side in your browser. The values you enter are processed locally and are never sent to our servers.
Preferences: Your theme (light/dark/auto) and sidebar state are stored in your browser's localStorage and never leave your device. Some calculators (for example, the mortgage, break-even, and ecommerce profit calculators) can also remember the inputs you entered in localStorage so you can pick up where you left off; this likewise stays on your device, is never sent to our servers, and is cleared by the calculator's Reset button or by clearing your browser storage. If you use a calculator's optional "Share link" button, your inputs are encoded into the link's web address so the recipient's browser can restore them — like any web address, a visited link's address is part of the page request.
Information you provide: If you contact us, we receive the information you choose to send (such as your message and any contact details) so we can respond.
Automatically collected technical data: Like most websites, our hosting and analytics may process standard technical information such as IP address, browser type, device type, referring page, and pages viewed. Where used for analytics, we use Google Analytics 4 with IP anonymization and only after you accept on the consent banner; this data is aggregated and does not include your calculator inputs.
Cookies and similar technologies
We use a small number of cookies and browser storage for essential functionality, preferences, optional analytics, and advertising. For full detail and controls, see our Cookie Policy.
Advertising and third-party vendors (Google AdSense)
To keep the site free, some pages display ads. We use third-party advertising networks, including Google AdSense.
- Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites.
- Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to our site and/or other sites on the internet.
- These advertising cookies and identifiers have historically included Google's DoubleClick DART cookie behaviour, which serves ads based on your visits to this and other sites; you can opt out of such personalised advertising using the links below.
- You may opt out of personalised advertising by visiting Google Ads Settings, or opt out of a third-party vendor's use of cookies for personalised advertising at aboutads.info, or — in the EU/UK — at youronlinechoices.eu.
- See Google's how Google uses information from sites that use its services and our Advertising Disclosure.
How we use information
We use the limited information described above to operate and secure the site, remember your preferences, understand aggregate usage so we can improve the calculators, display and measure advertising, and respond to messages you send us.
How we share information
We do not sell your personal information for money. We may share limited technical data with service providers that help us run the site — such as hosting, analytics, and advertising partners — who process it on our behalf or under their own policies. The use of advertising cookies may be considered "sharing" for targeted advertising under some laws; see Your Privacy Rights for how to limit this.
Data we do NOT collect
We do not collect or store on our servers: your specific calculator inputs, the in-site searches you perform, or any payment card details.
Legal bases for processing (GDPR)
Where the GDPR applies, we process personal data only where we have a lawful basis to do so: your consent (for example, for non-essential cookies and personalised advertising), our legitimate interests (operating, securing, and improving the site and measuring aggregate usage), and compliance with legal obligations. Where we rely on consent, you may withdraw it at any time.
Your privacy rights
Depending on your location, you may have rights to access, correct, delete, or restrict your personal data, and to opt out of certain advertising. Details and how to exercise them are on our Your Privacy Rights (GDPR & CCPA) page.
Data retention
We keep messages you send only as long as needed to respond and for reasonable record-keeping. Aggregated analytics data is retained per our providers' standard periods. Preference data lives in your browser until you clear it.
International users
Our service providers may process data in countries other than your own. Where required, appropriate safeguards are used for such transfers.
Children's privacy
Calculator Matters is a general-audience tool and is not directed to children under 13 (or the minimum age in your country). We do not knowingly collect personal information from children.
Security
We take reasonable measures to protect the site, but no method of transmission or storage is completely secure. Because calculations happen in your browser, the most sensitive data — your inputs — never leaves your device.
Third-party links
Our pages may link to external sites that have their own privacy policies. We are not responsible for the content or practices of those sites.
Changes to this policy
We may update this policy from time to time; the "Last updated" date above reflects the latest version.
Contact
Questions about this Privacy Policy, or requests to access or delete data, can be sent to [email protected] or via our contact page. To learn who runs the site, see About.
Privacy FAQ
Do you store the numbers I enter into a calculator?
No. Calculations run entirely in your browser. The figures you type are processed locally and are never sent to or stored on our servers. Any saved scenario is kept only in your own browser and is cleared by the calculator’s Reset button or by clearing your browser storage.
Do you sell my personal information?
No. We do not sell your personal information for money. We do use advertising cookies (including Google AdSense), which some laws treat as “sharing” for targeted advertising — you can opt out via the links in this policy and on the Your Privacy Rights page.
Do I need an account?
No. There is no sign-in, account, or password anywhere on the site. Every calculator is free to use without registering.
How do I turn off personalised ads?
You can opt out of personalised advertising at Google Ads Settings and at aboutads.info, and manage cookies through the controls described in our Cookie Policy. The calculators work the same with personalised ads off.
How do I delete a message I sent you, or ask what data you hold?
Email [email protected] or use the contact page. We keep contact messages only as long as needed to respond and for reasonable record-keeping, and we will action access or deletion requests as described on the Your Privacy Rights page.