Depends on the size of chain. 12 or 14mm rope to 8mm or 3/8 chain 16 or 18mm to 10mm chain. Three strand nylon (my preference) or anchorplait both spliced into chain if going over a windlass gypsy. Some people prefer a hard eye and shackle, particulalry if windlass is not used or rope is only for occasional use.
Good chart on Jimmy Green website and their prices can be OK at sale time.