Irish Transverse Mercator → WGS 84

Irish Transverse Mercator to latitude and longitude converter

Convert Irish Transverse Mercator eastings and northings to WGS 84 latitude and longitude, with coverage, datum and input-format notes.

Batch coordinate converter

Enter one Irish Transverse Mercator coordinate per line as easting, northing in metres.

Input example: 600000, 750000

0 of 100 coordinates

Results use: latitude, longitude order.

Output example: 53.5, -8

Numeric coordinates are rounded for display: decimal latitude/longitude to up to 6 decimal places, metre-based coordinates to up to 3, DMS seconds to up to 2, and DDM minutes to up to 4.

About this conversion

Convert Irish Transverse Mercator (EPSG:2157) eastings and northings from the island of Ireland to WGS 84 latitude and longitude.

Frequently asked questions

What input is accepted?

Enter ITM easting followed by northing, both in metres. Do not enter an older Irish Grid letter reference.

What output will I receive?

By default, results show WGS 84 latitude first and longitude second in decimal degrees. Select Reverse coordinate order to show longitude first. Displayed decimal places do not add accuracy to the source.

Which axes and units are used?

ITM input uses easting then northing in metres. WGS 84 output defaults to latitude then longitude in degrees.

How are precision and datum handled?

EPSG:2157 is based on IRENET95, aligned with ETRS89 for Irish mapping. Datum differences and source-coordinate quality still limit the result.

Where can I use this coordinate system?

ITM is intended for the island of Ireland. Coordinates outside its area of use are rejected rather than extrapolated.

What should I check?

  • Enter easting before northing and use numeric ITM values.
  • Distinguish ITM from the older Irish Grid letter-reference system.
  • Use source coordinates from the island of Ireland.

Can I enter an older Irish Grid reference?

No. Enter numeric Irish Transverse Mercator eastings and northings in EPSG:2157.

What datum is ITM based on?

EPSG:2157 is based on IRENET95, aligned with ETRS89 for Irish mapping.