Convert S-JTSK [JTSK03] to ETRS89

Convert coordinates from S-JTSK [JTSK03] (EPSG:8351) 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-8351-to-epsg-4258

Official EPSG transformation from S-JTSK [JTSK03] to ETRS89

The EPSG Geodetic Parameter Dataset defines 1 transformation between S-JTSK [JTSK03] (EPSG:8351) and ETRS89 (EPSG:4258). Its parameters, accuracy and area of use are listed below.

S-JTSK [JTSK03] to ETRS89 (1)

EPSG:8367±0.001 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Slovakia
Scope:: Geodesy.

Parameter	Value	Unit
X-axis translation(tx)	485.021	metre
Y-axis translation(ty)	169.465	metre
Z-axis translation(tz)	483.839	metre
X-axis rotation(rx)	-7.786342	arc-second
Y-axis rotation(ry)	-4.397554	arc-second
Z-axis rotation(rz)	-4.102655	arc-second
Scale difference(ds)	0	parts per million

Derived at 684 points. At the 1mm accuracy level this transformation is not reversible: for reverse see transformation code 8365. May be taken as approximate transformation to WGS 84 - see code 8368.

Convert EPSG:8351 to EPSG:4258 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:8351", "EPSG:4258", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:8351 — S-JTSK [JTSK03]

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

+proj=longlat +ellps=bessel +towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0 +no_defs +type=crs

More about EPSG:8351 →

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 S-JTSK [JTSK03] to ETRS89?: The most accurate official EPSG transformation between these systems is accurate to about ±0.001 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:8351 →