Convert GDA94 to WGS 84

Convert coordinates from GDA94 (EPSG:4283) 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-4283-to-epsg-4326

Official EPSG transformations from GDA94 to WGS 84

The EPSG Geodetic Parameter Dataset defines 3 transformations between GDA94 (EPSG:4283) and WGS 84 (EPSG:4326). Each applies to a specific area — pick the one whose area of use covers your data.

GDA94 to WGS 84 (1)

EPSG:1150±3 mBest accuracy

Method:: Geocentric translations (geog2D domain)
Area of use:: Australia - GDA
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)	0	metre
Y-axis translation(ty)	0	metre
Z-axis translation(tz)	0	metre

Approximation at the 3m level assuming WGS 84 is equivalent to GDA94. Ignores the low accuracy of the WGS 84 ensemble and the inconsistent application of tectonic plate motion to WGS 84 data.

GDA94 to WGS 84 (2)

EPSG:9688±3 m

Method:: Coordinate Frame rotation (geog2D domain)
Area of use:: Australia - GDA
Scope:: Alignment of datasets referenced to WGS 84 which have been derived from GDA2020 via the null transformation EPSG::8450 with GDA94 datasets.

Parameter	Value	Unit
X-axis translation(tx)	61.55	millimetre
Y-axis translation(ty)	-10.87	millimetre
Z-axis translation(tz)	-40.19	millimetre
X-axis rotation(rx)	-39.4924	milliarc-second
Y-axis rotation(ry)	-32.7221	milliarc-second
Z-axis rotation(rz)	-32.8979	milliarc-second
Scale difference(ds)	-9.994	parts per billion

Concatenation of CTs 8048 and 8450 through GDA2020. Scale difference in ppb where 1/billion = 1E-9. See GDA94 to WGS 84 (2) (CT code 9689) for alternative for Australia including distortion model.

GDA94 to WGS 84 (3)

EPSG:9689±3 m

Method:: NTv2
Area of use:: Australia - onshore
Scope:: Alignment of datasets referenced to WGS 84 which have been derived from GDA2020 via the null transformation EPSG::8450 with GDA94 datasets.

Grid file: GDA94_GDA2020_conformal_and_distortion.gsb

Equivalent to concatenation of CT 8447 and null CT 8450 through GDA2020. See GDA94 to WGS 84 (2) (CT code 9688) for conformal-only alternative (i.e. without distortion modelling).

Convert EPSG:4283 to EPSG:4326 in code

The same transformation with common GIS tools and libraries:

from pyproj import Transformer

transformer = Transformer.from_crs("EPSG:4283", "EPSG:4326", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)

Source: EPSG:4283 — GDA94

geographic system using latitude and longitude on an ellipsoid · Area of use: Australia - GDA

+proj=longlat +ellps=GRS80 +no_defs +type=crs

More about EPSG:4283 →

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 GDA94 to WGS 84?: The most accurate official EPSG transformation between these systems is accurate to about ±3 m within its stated area of use. Browser-based converters approximate datum shifts with Helmert parameters; for surveying-grade work apply the official transformation (including the grid-shift files listed below) 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:4283 →