Convert RT90 to ETRS89

Convert coordinates from RT90 (EPSG:4124) to ETRS89 (EPSG:4258) — 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-4124-to-epsg-4258

Official EPSG transformation from RT90 to ETRS89

The EPSG Geodetic Parameter Dataset defines 1 transformation between RT90 (EPSG:4124) and ETRS89 (EPSG:4258). Its parameters, accuracy and area of use are listed below.

RT90 to ETRS89 (1)

EPSG:1437±0.5 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Sweden
Scope:: Transformation of coordinates at 0.5m level of accuracy.

Parameter	Value	Unit
X-axis translation(tx)	419.3836	metre
Y-axis translation(ty)	99.3335	metre
Z-axis translation(tz)	591.3451	metre
X-axis rotation(rx)	-0.850389	arc-second
Y-axis rotation(ry)	-1.817277	arc-second
Z-axis rotation(rz)	7.862238	arc-second
Scale difference(ds)	-0.99496	parts per million

Derived at 22 points in 1993. Replaced by RT90 to SWEREF99 (1) (code 1895) from 2001. This transformation is actually between ETRS89 and RR92. RR92 is a geographic 3D CRS where the horizontal component is RT90.

Convert EPSG:4124 to EPSG:4258 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4124", "EPSG:4258", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4124 — RT90

geographic system using latitude and longitude on an ellipsoid · Area of use: Sweden

+proj=longlat +ellps=bessel +towgs84=414.1,41.3,603.1,-0.855,2.141,-7.023,0 +no_defs +type=crs

More about EPSG:4124 →

Target: EPSG:4258 — ETRS89

geographic system using latitude and longitude on an ellipsoid · Area of use: Europe - ETRF by country

+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs +type=crs

More about EPSG:4258 →

Frequently asked questions

How accurate is converting RT90 to ETRS89?: The most accurate official EPSG transformation between these systems is accurate to about ±0.5 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:4258 to EPSG:4124 →