EPSG:2154 — RGF93 v1 / Lambert-93

Projected coordinate system · coordinates in metres · France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica).

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EPSG:2154RGF93 v1 / Lambert-93

Coordinates in EPSG:4326 — one pair per line

Paste as many as you like: X,Y or X Y or X;Y (optional Z). Columns copied from Excel or a CSV work as-is.

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🔒 Runs entirely in your browser with GDAL WebAssembly — the same PROJ engine used by QGIS, PostGIS, and ArcGIS. Nothing is uploaded. Output units: metre.

Worked example — the centre of this system's area of use: 0.26, 46.355 (EPSG:4326 lon, lat) = 489,353.59, 6,587,552.2 (EPSG:2154).

EPSG:2154 is RGF93 / Lambert-93 — the official projected coordinate system of metropolitan France. It is a Lambert Conformal Conic projection on the RGF93 datum (French realisation of ETRS89), with coordinates in metres. All French national data — IGN maps, cadastre, government open data — is published in Lambert-93.

It replaced the older Lambert zone systems (Lambert I–IV, EPSG:27561–27564) and NTF datum. If you have legacy French data with Y values around 2 million rather than 6–7 million, you are probably looking at an old Lambert zone, not Lambert-93.

EPSG:2154 details

TypeProjected CRS

DatumReseau Geodesique Francais 1993 v1

Unitsmetre

AxesEasting (east) · Northing (north)

Projection methodLambert Conic Conformal (2SP)

ScopeEngineering survey, topographic mapping.

Base CRSEPSG:4171

Area of use

France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica).

WGS84 bounds: -9.86° to 10.38° longitude, 41.15° to 51.56° latitude.

Well-known text (WKT2)

Show WKT2 definition for EPSG:2154

PROJCRS["RGF93 v1 / Lambert-93",BASEGEOGCRS["RGF93 v1",DATUM["Reseau Geodesique Francais 1993 v1",ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4171]],CONVERSION["Lambert-93",METHOD["Lambert Conic Conformal (2SP)",ID["EPSG",9802]],PARAMETER["Latitude of false origin",46.5,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8821]],PARAMETER["Longitude of false origin",3,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8822]],PARAMETER["Latitude of 1st standard parallel",49,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8823]],PARAMETER["Latitude of 2nd standard parallel",44,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8824]],PARAMETER["Easting at false origin",700000,LENGTHUNIT["metre",1],ID["EPSG",8826]],PARAMETER["Northing at false origin",6600000,LENGTHUNIT["metre",1],ID["EPSG",8827]]],CS[Cartesian,2],AXIS["easting (X)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["northing (Y)",north,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["Engineering survey, topographic mapping."],AREA["France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica)."],BBOX[41.15,-9.86,51.56,10.38]],ID["EPSG",2154]]

Frequently asked questions

How do I convert GPS coordinates to Lambert-93?

Set this page's converter to go from EPSG:4326 to EPSG:2154 and paste longitude, latitude. Paris is roughly X = 652,000, Y = 6,862,000 in Lambert-93. RGF93 is aligned with WGS 84 to centimetre level, so no significant datum shift is involved.

What is the difference between Lambert-93 and the old Lambert zones?

Lambert-93 (EPSG:2154) is a single projection covering all of metropolitan France on the modern RGF93 datum. The old system divided France into four east-west bands (Lambert I–IV) on the NTF datum. Converting old zone data requires both a projection change and an NTF→RGF93 datum shift.

Does EPSG:2154 cover Corsica and overseas territories?

Corsica yes — Lambert-93 covers all of metropolitan France including Corsica. Overseas territories use their own systems (e.g. RGAF09 / UTM 20N for the French Antilles, RGR92 / UTM 40S for Réunion).