These are the NSW topographic map boundaries, extracted from the NSW DTDB (Digital Topographic Database) as at 06/05/2016. The maps are a mix of 1:25000, 1:50000 and 1:100000. Most NSW maps are a standard size:
Some maps, typically those on parts of the coast, are only half as wide, to avoid printing large amounts of sea. A few are slightly larger, to avoid printing an extra map. Two maps (Bombo Point, Nadgee) have a separate inset, and one map (Caloola, on the Queensland border) is not rectangular in shape.
Spreadsheet to convert 6-figure grid references for NSW to full UTM references. Inputs are the map name and the 6 figure grid reference. Basic spreadsheet with no macros.
Download conversion spreadsheet (XLSX)