Source: EPSG:4326 — WGS 84
geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)
+proj=longlat +datum=WGS84 +no_defs +type=crsMore about EPSG:4326 →
Convert EPSG:4326 to EPSG:2154
Online coordinate converter from WGS 84 (EPSG:4326) to RGF93 v1 / Lambert-93 (EPSG:2154). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
About converting WGS 84 to RGF93 v1 / Lambert-93
Converting from WGS 84 (EPSG:4326) to RGF93 / Lambert-93 (EPSG:2154) is the standard projection for any spatial work in metropolitan France. Lambert-93 is a Lambert Conformal Conic projection with two standard parallels (44°N and 49°N), false easting 700,000 m and false northing 6,600,000 m on the GRS 80 ellipsoid.
Because RGF93 is aligned with ETRS89 (and therefore close to ITRF at epoch 1993), the WGS 84 ↔ RGF93 datum shift is essentially negligible at present-day epochs — the residual is well under a metre and the transformation can be treated as a pure projection change for most purposes.
Lambert-93 has been the legal CRS of France since 2000 and replaces the four-zone Lambert Carto system (codes 27561-27564) for all new mapping.
Why people convert EPSG:4326 to EPSG:2154
- Imports into IGN BD ORTHO, BD TOPO and SCAN 25 mapping
- French cadastre and Land Registry data
- Public datasets on data.gouv.fr
- Civil engineering and urban planning in France
Try it: Eiffel Tower, Paris
Input (EPSG:4326): 2.2945, 48.8584
Convert EPSG:4326 to EPSG:2154 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4326", "EPSG:2154", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:2154 — RGF93 v1 / Lambert-93
projected system measured in linear units (typically metres) · Area of use: France
+proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crsMore about EPSG:2154 →
Frequently asked questions
- Is the WGS 84 to Lambert-93 transformation accurate enough for surveying?
- RGF93 is aligned with ETRS89 to within a few centimetres, and at modern epochs the WGS 84 ↔ ETRS89 difference across France is roughly 60 cm. For surveying use a time-stamped ETRS89 realisation rather than the generic WGS 84 code.
- How accurate is converting WGS 84 to RGF93 v1 / Lambert-93?
- Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift transformation in a desktop GIS.
- Does my data leave the browser when I use this converter?
- No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.