Data Sources

Local calculations

Most tools compute results directly in your browser using documented formulas — no external data required.

Where relevant we rely on official documentation, government data and established academic formulas.

Live-data tools display the provider name, the last successful update time, and whether the value is cached.

If a provider is unavailable we show a clear message rather than inventing data.

To suggest a reliable data source, contact needme7760@gmail.com.