Gauss-Boaga West to WGS84 Coordinate Converter
Free online tool to convert coordinates from Monte Mario / Italy zone 1 (Gauss-Boaga West) (EPSG:3003) to World Geodetic System 1984 (lat/lng) (EPSG:4326). Professional-grade accuracy using proj4, zero install, runs in your browser.
About Gauss-Boaga West
Monte Mario / Italy zone 1 (Gauss-Boaga West) (EPSG:3003). Italian national grid for western Italy (west of 12° longitude — Piemonte, Lombardia, Liguria, Toscana, Lazio). Historical system, still widely used in cadastral and survey workflows.
About WGS84
World Geodetic System 1984 (lat/lng) (EPSG:4326). The global reference system used by GPS, Google Maps and virtually all modern navigation. Defined by satellite geodesy and continuously refined.
Frequently Asked Questions
What is the difference between Gauss-Boaga West and WGS84?
Gauss-Boaga West (EPSG:3003) is national grid and based in Italy, while WGS84 (EPSG:4326) is geographic based in Global. Italian national grid for western Italy (west of 12° longitude — Piemonte, Lombardia, Liguria, Toscana, Lazio). Historical system, still widely used in cadastral and survey workflows. In contrast, the global reference system used by gps, google maps and virtually all modern navigation. defined by satellite geodesy and continuously refined.
Is this conversion accurate for surveying?
Yes. The conversion uses the industry-standard proj4 library with full datum shift parameters (including seven-parameter Helmert transformation for Gauss-Boaga West). Typical accuracy is sub-meter for civilian applications. For cadastral precision, always verify against the official agency datum.
What coordinate format should I use?
For Gauss-Boaga West, enter coordinates as easting, northing in meters (e.g. 514500, 5033880). The tool auto-detects the format.
Can I convert many points at once?
Yes, use our batch CSV converter. Upload a CSV with your points, select the transformation, download the converted file. Free with a SurveyingPedia account.
Is there an API?
Yes — call /api/v1/transform?from=EPSG:3003&to=EPSG:4326&coords=lat,lng for programmatic access. It returns the transformed coordinates as JSON.