About zCalc
zCalc is the international name of the platform. It brings practical online calculators into one catalog and provides fast, verifiable results without registration.
Principles
Each tool has its own URL, a clear description, an input form and a result section. Calculations run on the server; JavaScript is an optional enhancement that starts only after consent.
Catalog architecture
The platform uses a shared calculator registry and calculation engine. This allows new tools to be added without duplicating controllers and core UI logic.