Letter (A–Z, no I) followed by an even number of digits — the first half is the easting offset, the second the northing offset within that 100 km square. Space is optional.
Decimal degrees, WGS84 / ETRS89. West of Greenwich is negative.
One point per line. Optional label first, comma-separated, then the coordinate in the format selected above (Irish Grid references can also be pasted without a label).
02 Converted coordinates
Enter a coordinate and hit Convert to see it in all four systems.