About this calculator

This project is a static, mobile first calculator focused on one job: express how much a value fell as a percent of the starting amount.

There is no account system, no server side storage of inputs, and no paywall. The tool is meant for quick desk checks, draft reports, and teaching moments where clarity matters more than spreadsheet features.

If you need audit trails, role based access, or company specific definitions, export the numbers you trust from your systems of record and treat this page as a lightweight companion, not the final authority.