Convert ED50 / UTM zone 31N to ETRS89 / UTM zone 31N

Convert coordinates from ED50 / UTM zone 31N (EPSG:23031) to ETRS89 / UTM zone 31N (EPSG:25831) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

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Input (x, y)

Output (x, y)

Direct link to this transformation: epsgtransform.com/transform/epsg-23031-to-epsg-25831

Official EPSG transformation from ED50 / UTM zone 31N to ETRS89 / UTM zone 31N

The EPSG Geodetic Parameter Dataset defines 1 transformation between ED50 / UTM zone 31N (EPSG:23031) and ETRS89 / UTM zone 31N (EPSG:25831). Its parameters, accuracy and area of use are listed below.

ED50 / UTM zone 31N to ETRS89 / UTM zone 31N (1)

EPSG:5166±0.05 m

Method:: Similarity transformation
Area of use:: Spain - Catalonia onshore
Scope:: Transformation of coordinates at 0.05m level of accuracy.

Parameter	Value	Unit
Ordinate 1 of evaluation point in target CRS	-129.549	metre
Ordinate 2 of evaluation point in target CRS	-208.185	metre
Scale factor for source CRS axes	1.0000015504	unity
Rotation angle of source CRS axes	1.56504	arc-second

ICC publishes as two tfms, code 100800400 for ED50 to ETRS89 and code 800100400 for reverse when ordinate 1 = 129.547m, ordinate 2 = 208.186m, dS = 0.9999984496 and rotation = -1.56504". See ED50 to ETRS89 (14) (code 5661) for emulation using NTv2.

Convert EPSG:23031 to EPSG:25831 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:23031", "EPSG:25831", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:23031 — ED50 / UTM zone 31N

projected system measured in linear units (typically metres) · Area of use: Europe - 0°E to 6°E and ED50 by country

+proj=utm +zone=31 +ellps=intl +units=m +no_defs +type=crs

More about EPSG:23031 →

Target: EPSG:25831 — ETRS89 / UTM zone 31N

projected system measured in linear units (typically metres) · Area of use: Europe - 0°E to 6°E and ETRS89 by country

+proj=utm +zone=31 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs

More about EPSG:25831 →

Frequently asked questions

How accurate is converting ED50 / UTM zone 31N to ETRS89 / UTM zone 31N?: The most accurate official EPSG transformation between these systems is accurate to about ±0.05 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:25831 to EPSG:23031 →