A major ERP upgrade will run about 18 percent of the original installation cost, according to an AMR Research survey. For companies with 500 users of ERP software, the average cost was $533,594 or about $1,000 per user. For companies with 2,000 users, the cost was $1.2 million or about $595 per user. For large companies with more than 8,400 users, the total came to $2.6 million or $300 per user.
Source: AMR Research January 2002 survey of 109 companies with at least 2,500 employees