Irish Transverse Mercator to wgs 1984 web mercator (auxiliary sphere)

[BrendanMcCann]

Hi all, would anyone know a way of converting ITM co ordinates to wgs 1984 web mercator (auxiliary sphere) using ArcGIS pro? I've tried using different websites but they round up the Easting and Northing giving an inaccurate latitude and longitude. I've attached a CSV containing the ITM co ordinates for reference. Thanks. 

[DanPatterson]

If you make it a table (assuming it has coordinates in it), then define its coordinate system as it stands, then use the Project Tool to project it to your desired coordinate system.

several options for step 1

XY Table To Point (Data Management)—ArcGIS Pro | Documentation

Make XY Event Layer (Data Management)—ArcGIS Pro | Documentation

Project (Data Management)—ArcGIS Pro | Documentation

[BrendanMcCann]

Yeah we can do all that.

Just wondering what coordinate system choice relates to coordinates
captured to the ITM irish coordinate system as opposed to the TM75 Irish
Grid option?

Thanks

[Robert_LeClair]

@MelitaKennedy  - any thoughts?