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Convert Monte Mario to ETRS89

Convert coordinates from Monte Mario (EPSG:4265) to ETRS89 (EPSG:4258) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.

Direct link to this transformation: epsgtransform.com/transform/epsg-4265-to-epsg-4258

Official EPSG transformations from Monte Mario to ETRS89

The EPSG Geodetic Parameter Dataset defines 3 transformations between Monte Mario (EPSG:4265) and ETRS89 (EPSG:4258). Each applies to a specific area — pick the one whose area of use covers your data.

Monte Mario to ETRS89 (1)

EPSG:1659±4 mBest accuracy
Method:
Position Vector transformation (geog2D domain)
Area of use:
Italy - mainland
Scope:
Transformation of coordinates at 4m level of accuracy.
ParameterValueUnit
X-axis translation(tx)-104.1metre
Y-axis translation(ty)-49.1metre
Z-axis translation(tz)-9.9metre
X-axis rotation(rx)0.971arc-second
Y-axis rotation(ry)-2.917arc-second
Z-axis rotation(rz)0.714arc-second
Scale difference(ds)-11.68parts per million

May be taken as approximate transformation Monte Mario to WGS 84 - see code 1660. For more accurate transformations to explicit realizations of ETRS89 see Monte Mario to IGM95 (4) and Monte Mario to RDN2008 (5), CTs 9733 and 9734.

Monte Mario to ETRS89 (2)

EPSG:1661±4 m
Method:
Position Vector transformation (geog2D domain)
Area of use:
Italy - Sardinia onshore
Scope:
Transformation of coordinates at 4m level of accuracy.
ParameterValueUnit
X-axis translation(tx)-168.6metre
Y-axis translation(ty)-34metre
Z-axis translation(tz)38.6metre
X-axis rotation(rx)-0.374arc-second
Y-axis rotation(ry)-0.679arc-second
Z-axis rotation(rz)-1.379arc-second
Scale difference(ds)-9.48parts per million

May be taken as approximate transformation Monte Mario to WGS 84 - see code 1662. For more accurate transformations to explicit realizations of ETRS89 see Monte Mario to IGM95 (4) and Monte Mario to RDN2008 (5), CTs 9733 and 9734.

Monte Mario to ETRS89 (3)

EPSG:1663±4 m
Method:
Position Vector transformation (geog2D domain)
Area of use:
Italy - Sicily onshore
Scope:
Transformation of coordinates at 4m level of accuracy.
ParameterValueUnit
X-axis translation(tx)-50.2metre
Y-axis translation(ty)-50.4metre
Z-axis translation(tz)84.8metre
X-axis rotation(rx)-0.69arc-second
Y-axis rotation(ry)-2.012arc-second
Z-axis rotation(rz)0.459arc-second
Scale difference(ds)-28.08parts per million

May be taken as approximate transformation Monte Mario to WGS 84 - see code 1664. For more accurate transformations to explicit realizations of ETRS89 see Monte Mario to IGM95 (4) and Monte Mario to RDN2008 (5), CTs 9733 and 9734.

Convert EPSG:4265 to EPSG:4258 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4265", "EPSG:4258", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4265 — Monte Mario

geographic system using latitude and longitude on an ellipsoid · Area of use: Italy - including San Marino and Vatican

+proj=longlat +ellps=intl +no_defs +type=crs
More about EPSG:4265 →

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 Monte Mario to ETRS89?
The most accurate official EPSG transformation between these systems is accurate to about ±4 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:4265 →