Convert EPSG:27571 to EPSG:4978

Online coordinate converter from NTF (Paris) / Lambert zone I (EPSG:27571) to WGS 84 (EPSG:4978). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.

From

Input (x, y)

Output (x, y)

Direct link to this transformation: epsgtransform.com/transform/epsg-27571-to-epsg-4978

Convert EPSG:27571 to EPSG:4978 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:27571", "EPSG:4978", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:27571 — NTF (Paris) / Lambert zone I

projected system measured in linear units (typically metres) · Area of use: France - mainland north of 48.15°N

+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=0 +k_0=0.999877341 +x_0=600000 +y_0=1200000 +ellps=clrk80ign +pm=paris +towgs84=-168,-60,320,0,0,0,0 +units=m +no_defs +type=crs

More about EPSG:27571 →

Target: EPSG:4978 — WGS 84

geocentric Cartesian system (Earth-centred Earth-fixed) · Area of use: World

+proj=geocent +datum=WGS84 +units=m +no_defs +type=crs

More about EPSG:4978 →

Frequently asked questions

How accurate is converting NTF (Paris) / Lambert zone I to WGS 84?: 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.

Need the reverse? Convert EPSG:4978 to EPSG:27571 →