EPSG:2157 · Europe
Irish Transverse Mercator (ITM) to KML & KMZ
Convert Irish Transverse Mercator (ITM) eastings and northings to latitude and longitude, and save them as a Google Earth KML or KMZ. Try a single point here, or convert a whole spreadsheet in the web app.
- Converter already set to EPSG:2157
- Datum shift to WGS 84 applied automatically
- Whole sheets with photos and boundaries in the web or Windows app
About Irish Transverse Mercator (ITM)
Irish Transverse Mercator is the national grid for Ireland and Northern Ireland, on the IRENET95 datum (the Irish realisation of ETRS89). It replaced the older Irish Grid for new mapping and is treated as WGS 84 for Google Earth work.
Where it's used: Ireland and Northern Ireland: national mapping, planning and engineering surveys.
Convert a whole spreadsheet
- Open the web app or the Windows app, and paste your rows from Excel or open a CSV file.
- Under Coordinate system, search for “2157” and pick IRENET95 / Irish Transverse Mercator.
- Check one point you know on the map, then press Save KML or Save KMZ (with photos) and open it in Google Earth.
Check points for Irish Transverse Mercator (ITM)
Five points inside the area of use of Irish Transverse Mercator (ITM), with their latitude and longitude on WGS 84 and their easting and northing in this grid (metres). Enter an easting and northing in the converter above: you should get the latitude and longitude shown, to a few centimetres.
| Point | Latitude | Longitude | Easting | Northing |
|---|---|---|---|---|
| Middle of the area of use | 53.41000° N | 7.95000° W | 603,324.38 | 739,986.43 |
| Towards the north-west | 54.62200° N | 9.51600° W | 502,096.37 | 875,919.16 |
| Towards the north-east | 54.62200° N | 6.38400° W | 704,361.10 | 876,063.10 |
| Towards the south-west | 52.19800° N | 9.51600° W | 496,365.76 | 606,218.49 |
| Towards the south-east | 52.19800° N | 6.38400° W | 710,469.84 | 606,366.15 |
Common mistakes with Irish Transverse Mercator (ITM)
- Easting and northing swapped. In Irish Transverse Mercator (ITM) the middle of the grid is near easting 603,324.38 and northing 739,986.43. If your easting column holds numbers like 739,986.43, the columns are the wrong way round and every point lands far away: swap them before converting.
- Feet entered as metres. Irish Transverse Mercator (ITM) is in metres. Coordinates copied from a drawing in feet must be converted first, or every point moves outwards from the grid's origin.
- Forgetting the datum. Irish Transverse Mercator (ITM) is not on WGS 84: treated as WGS 84, no shift (the datums agree to about a metre or better). Picking a WGS 84 grid with the same projection instead leaves the points off by that amount.
- Points outside the grid's area. Irish Transverse Mercator (ITM) is meant for Ireland - onshore. United Kingdom (UK) - Northern Ireland (Ulster) - onshore. Points well outside that area convert with growing error; the converter flags them so you can choose the right grid.
- A local site grid. If every point is off by the same distance and direction, the drawing may be on a local site grid. Calibrate on three or more known control points instead.
Before you rely on it
Drawings on the older Irish Grid (EPSG 29902) need that system instead. Their numbers are much smaller: about 400 km less in easting and 500 km less in northing than ITM. Always check one known control point before sending a file out.