Lambert 93 to UTM Zone 31N Coordinate Converter
Free online tool to convert coordinates from RGF93 / Lambert-93 (France mainland) (EPSG:2154) to WGS84 / UTM zone 31N (EPSG:32631). 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 UTM Zone 31N
WGS84 / UTM zone 31N (EPSG:32631). UTM zone 31N covers 0° to 6° East — France, Benelux, Spain (Catalunya), UK west.
Frequently Asked Questions
What is the difference between Lambert 93 and UTM Zone 31N?
Lambert 93 (EPSG:2154) is national grid and based in France, while UTM Zone 31N (EPSG:32631) is utm 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, utm zone 31n covers 0° to 6° east — france, benelux, spain (catalunya), uk west.
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:32631&coords=lat,lng for programmatic access. It returns the transformed coordinates as JSON.