Lambert 93 to WGS84 Coordinate Converter
Free online tool to convert coordinates from RGF93 / Lambert-93 (France mainland) (EPSG:2154) to World Geodetic System 1984 (lat/lng) (EPSG:4326). Professional-grade accuracy using proj4, zero install, runs in your browser.
About Lambert 93
RGF93 / Lambert-93 (France mainland) (EPSG:2154). The official projection of metropolitan France since 2000. Covers all mainland France + Corsica in a single system with minimal distortion.
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 Lambert 93 and WGS84?
Lambert 93 (EPSG:2154) is national grid and based in France, while WGS84 (EPSG:4326) is geographic based in Global. The official projection of metropolitan France since 2000. Covers all mainland France + Corsica in a single system with minimal distortion. 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 (). 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 Lambert 93, 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:2154&to=EPSG:4326&coords=lat,lng for programmatic access. It returns the transformed coordinates as JSON.