Your numbers stay yours
OnlyCalculators is built to be useful without watching you. Here's the plain-English version.
Calculations run in your browser
Every calculator computes locally on your device. The values you type, your weight, your salary, your measurements, are never transmitted to our servers, because there is no server doing the math.
No accounts
You don't need to sign up to use anything here. We don't ask for your name or email to run a calculator, and we ourselves do not build a personal profile of you. When you copy a result link, the inputs are encoded in that URL so you can share or revisit them; that link is only created when you ask for it.
Advertising
This site is free because it shows ads. We use Adsterra, a third-party ad network, to serve the display ads you see on calculator pages. To do this, Adsterra and its advertising partners may set their own cookies or similar identifiers in your browser and collect data such as your IP address, device and browser information, and how you interact with ads, in order to show ads and measure their performance. This processing is carried out by Adsterra as a third party; we do not receive or store that advertising data ourselves.
You can review Adsterra's practices and opt-out options in the Adsterra Privacy Policy. You can also limit interest-based advertising through industry tools such as YourAdChoices (US) and Your Online Choices (EU), and through your browser's cookie and tracking controls.
Your choices (GDPR / CCPA)
Depending on where you live, you may have the right to access, correct, or delete personal data, to object to or restrict certain processing, and to opt out of the sale or sharing of personal information for targeted advertising. Because the advertising data described above is collected by Adsterra rather than by us, the most direct controls are the ad-network and browser opt-outs linked above. For anything else, contact us and we will help or point you to the right place.
Analytics
If we measure traffic, we use privacy-friendly, aggregate analytics that record anonymous page-view counts only, never used to identify you personally.
Embedded calculators
Our embeddable widgets load only the calculator and an attribution link, and set no tracking cookies of our own on the sites that host them.
Contact
Questions about privacy or a data request? Reach us through our contact page. See also our Terms of Use.