Free tool
GDA94 to GDA2020 converter
Convert points between GDA94 and GDA2020, as latitude and longitude or as MGA grid coordinates. It runs in your browser. Nothing you enter is sent anywhere.
Method and accuracy
- Method: the 7-parameter conformal transformation published by ICSM in the GDA2020 Technical Manual (three shifts, three rotations and a scale change applied to Earth-centred coordinates on the GRS80 ellipsoid). The reverse direction applies the exact inverse of the same transformation.
- MGA grid coordinates are converted to latitude and longitude and back using the Transverse Mercator projection on GRS80 (scale factor 0.9996, false easting 500,000 m, false northing 10,000,000 m). The result stays in the zone you choose.
- Accuracy: the transformation reproduces the published values to the precision of the published values. It does not model local distortion in the GDA94 network, which can be up to about 0.1 m in places. For cadastral or other work that needs it, use the ICSM conformal and distortion grid.
- Heights: the optional height in latitude and longitude mode is an ellipsoidal height and is transformed too. This tool does not convert AHD heights or apply a geoid model.
- Use the reference check above to see the Alice Springs (ALIC) station run through the tool next to the values in the GDA2020 Technical Manual.
- This tool is a convenience, not a survey deliverable. Check results against your own control, and use the official ICSM tools for work you certify. Provided as is, in line with the terms.