What this site stores and why.

Calculator data

Calculator values stay in your browser while you use the page. They are saved to browser local storage only when you select Save Inputs, and they are removed when you select Reset or clear this site's browser data. Exported CSV files are created in your browser.

First-party traffic analytics

We record page path, referring source or campaign tags, device class, country code supplied by our hosting provider, and random visitor and session identifiers. These records help us understand aggregate usage and diagnose site problems. The analytics system does not ask for your name, email address, calculator inputs, or Seller Central credentials.

Two first-party cookies support this measurement: a visitor identifier that can last up to one year and a session identifier that can last up to 30 minutes. You can remove them through your browser's site-data settings.

Google advertising services

If Google ads are displayed, Google and its partners may use cookies, web beacons, IP addresses, or similar technologies to serve and measure ads, prevent fraud, and personalize advertising where permitted. Google explains how it uses data from sites and apps that use its services on its partner-sites policy page.

You can manage Google ad personalization in Google Ads Settings. Browser controls and regional consent choices may provide additional options.

External links and retention

Links to Amazon, Google, and other third-party sites are governed by those services' own privacy policies. Operational records are retained only as reasonably needed for aggregate reporting, security, error investigation, and applicable legal obligations.