In order to estimate the cost, it is necessary to find out whether it is pay per user, pay per use or just the licensing fee.
Pay per user method charges for each member that gets herself or himself registered into the learning management system.
Pay per use is based on costs charged from a user for using the LMS software for a limited period of time.
Then there is license fee which is varied for varied learning management software.
All in all, the average learning management software cost varies for each learning management solution. Paid learning management systems also provide usage of their tools for free on trial basis for a limited period.