I think it is usually enough to set 2 for decimals (that will be centimeters). In this case you don't need extra accuracy. You usually use extra accuracy, when you need nigher accuracy than is available by setting the highest value in for Decimals.
2 for decimals should be fine for areas and volumes as well, also for angles.
Set it this way, create some lists, and see if it is enough for your purposes. If not set decimals a step higher.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28
