Privacy

Your calculator inputs

Updated 2026-10-03.

Calculations run in your browser. This version does not send your calculator inputs to a server and has no accounts, analytics scripts, advertising scripts or cookies added by the calculator.

Optional saved inputs

Choosing “Save inputs on this device” stores the current calculator's inputs in your browser's local storage. Saving is optional. Inputs are loaded when you return to the same calculator in the same browser. You can clear them using “Clear saved inputs” or by clearing this site's browser data.

Saved inputs do not synchronize to other devices. Anyone using the same browser profile may be able to see them. Editing an input does not automatically overwrite a saved set; choose Save again to update it.

Appearance preference

The theme control follows your device’s appearance by default. Choosing Light or Dark saves only that preference in this browser’s local storage. Choose System to remove the saved preference and follow your device again. Theme preferences are separate from saved calculator inputs.

Website requests and links

Loading a website sends normal request information, such as your IP address and browser details, to its host. The calculator does not request this information for its calculations. Links to eBay open a third-party site governed by its own privacy policy.

If analytics or monetization are added in a later version, this page must be updated to describe them.