Convert CH1903+ to WGS 84

Convert coordinates from CH1903+ (EPSG:4150) to WGS 84 (EPSG:4326) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

From

Input (lon, lat (decimal degrees))

Output (lon, lat (decimal degrees))

Direct link to this transformation: epsgtransform.com/transform/epsg-4150-to-epsg-4326

Official EPSG transformation from CH1903+ to WGS 84

The EPSG Geodetic Parameter Dataset defines 1 transformation between CH1903+ (EPSG:4150) and WGS 84 (EPSG:4326). Its parameters, accuracy and area of use are listed below.

CH1903+ to WGS 84 (1)

EPSG:1676±1 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Europe - Liechtenstein and Switzerland
Scope:: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences.

Parameter	Value	Unit
X-axis translation(tx)	674.374	metre
Y-axis translation(ty)	15.056	metre
Z-axis translation(tz)	405.346	metre

Parameter values are from CH1903+ to ETRS89 (1) (code 1647) assuming that ETRS89 is equivalent to WGS 84.

Convert EPSG:4150 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4150", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4150 — CH1903+

geographic system using latitude and longitude on an ellipsoid · Area of use: Europe - Liechtenstein and Switzerland

+proj=longlat +ellps=bessel +towgs84=674.374,15.056,405.346,0,0,0,0 +no_defs +type=crs

More about EPSG:4150 →

Target: 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=crs

More about EPSG:4326 →

Frequently asked questions

How accurate is converting CH1903+ to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±1 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official 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:4326 to EPSG:4150 →