Convert Monte Mario to WGS 84

Convert coordinates from Monte Mario (EPSG:4265) 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-4265-to-epsg-4326

Official EPSG transformations from Monte Mario to WGS 84

The EPSG Geodetic Parameter Dataset defines 11 transformations between Monte Mario (EPSG:4265) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.

Monte Mario to WGS 84 (4)

EPSG:1660±4 mBest accuracy

Method:: Position Vector transformation (geog2D domain)
Area of use:: Italy - mainland
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)	-104.1	metre
Y-axis translation(ty)	-49.1	metre
Z-axis translation(tz)	-9.9	metre
X-axis rotation(rx)	0.971	arc-second
Y-axis rotation(ry)	-2.917	arc-second
Z-axis rotation(rz)	0.714	arc-second
Scale difference(ds)	-11.68	parts per million

Parameter values from Monte Mario to ETRS89 (1) (code 1659). Assumes ETRS89 and WGS 84 can be considered the same to within the accuracy of the transformation.

Monte Mario to WGS 84 (2)

EPSG:1662±4 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: Italy - Sardinia onshore
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)	-168.6	metre
Y-axis translation(ty)	-34	metre
Z-axis translation(tz)	38.6	metre
X-axis rotation(rx)	-0.374	arc-second
Y-axis rotation(ry)	-0.679	arc-second
Z-axis rotation(rz)	-1.379	arc-second
Scale difference(ds)	-9.48	parts per million

Parameter values from Monte Mario to ETRS89 (2) (code 1661). Assumes ETRS89 and WGS 84 can be considered the same to within the accuracy of the transformation.

Monte Mario to WGS 84 (3)

EPSG:1664±4 m

Method:: Position Vector transformation (geog2D domain)
Area of use:: Italy - Sicily onshore
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)	-50.2	metre
Y-axis translation(ty)	-50.4	metre
Z-axis translation(tz)	84.8	metre
X-axis rotation(rx)	-0.69	arc-second
Y-axis rotation(ry)	-2.012	arc-second
Z-axis rotation(rz)	0.459	arc-second
Scale difference(ds)	-28.08	parts per million

Parameter values from Monte Mario to ETRS89 (3) (code 1663). Assumes ETRS89 and WGS 84 can be considered the same to within the accuracy of the transformation.

Monte Mario to WGS 84 (5)

EPSG:1088±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Adriatic - North Ancona
Scope:: Oil and gas exploration and production.

Parameter	Value	Unit
X-axis translation(tx)	-223.7	metre
Y-axis translation(ty)	-67.38	metre
Z-axis translation(tz)	1.34	metre

Monte Mario to WGS 84 (6)

EPSG:1089±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Adriatic - South Ancona / North Gargano
Scope:: Oil and gas exploration and production.

Parameter	Value	Unit
X-axis translation(tx)	-225.4	metre
Y-axis translation(ty)	-67.7	metre
Z-axis translation(tz)	7.85	metre

Monte Mario to WGS 84 (7)

EPSG:1090±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Adriatic - South Gargano
Scope:: Oil and gas exploration and production.

Parameter	Value	Unit
X-axis translation(tx)	-227.1	metre
Y-axis translation(ty)	-68.1	metre
Z-axis translation(tz)	14.4	metre

Monte Mario to WGS 84 (8)

EPSG:1091±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Otranto channel
Scope:: Marine navigation.

Parameter	Value	Unit
X-axis translation(tx)	-231.61	metre
Y-axis translation(ty)	-68.21	metre
Z-axis translation(tz)	13.93	metre

Monte Mario to WGS 84 (9)

EPSG:1092±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - north Ionian Sea
Scope:: Marine navigation.

Parameter	Value	Unit
X-axis translation(tx)	-225.06	metre
Y-axis translation(ty)	-67.37	metre
Z-axis translation(tz)	14.61	metre

Monte Mario to WGS 84 (10)

EPSG:1093±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Sicily Strait east of 13°E
Scope:: Marine navigation.

Parameter	Value	Unit
X-axis translation(tx)	-229.08	metre
Y-axis translation(ty)	-65.73	metre
Z-axis translation(tz)	20.21	metre

Monte Mario to WGS 84 (11)

EPSG:1094±10 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Sicily Strait west of 13°E
Scope:: Marine navigation.

Parameter	Value	Unit
X-axis translation(tx)	-230.47	metre
Y-axis translation(ty)	-56.08	metre
Z-axis translation(tz)	22.43	metre

Monte Mario to WGS 84 (1)

EPSG:1169±44 m

Method:: Geocentric translations (geog2D domain)
Area of use:: Italy - Sardinia onshore
Scope:: Military survey.

Parameter	Value	Unit
X-axis translation(tx)	-225	metre
Y-axis translation(ty)	-65	metre
Z-axis translation(tz)	9	metre

Derived at 1 station. Accuracy 25m in each axis.

Convert EPSG:4265 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4265", "EPSG:4326", 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: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 Monte Mario to WGS 84?: 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:4326 to EPSG:4265 →