Calculating How Many Maximum Number Of Users Required If We Need To Achieve 12K Transactions With SLA Of 5 Minutes

Total Number of Transactions to be completed = 12,000
Average Response Time = 5 Minutes

To avoid putting much load on the system I will add 5 Minutes so that to total time taken to complete one iteration will be 10 Minutes. This addition will include the thinktime between the each screen/transaction traverse.

Now, I know each iteration will take 10 Minutes to complete, hence in 60 Minutes only 6 transactions can be completed. i.e. 1 User will do 6 transactions in an hour.

Now how to calculate how many users are required to complete 12,000 transactions in an hour?
The calculation will be:
#Users Required = 12,000/6
= 2000 Users

This way we can find the number of users required if total throughput is provided with an average response time.

Hence to achieve 12,000 transactions I need 2000 Users with 5 minutes of thinktime in between the iterations with an average response time of 5 Minutes.

Hope this post helps you to come-up with a Workload Modelling Concept (a bit). Please do let me know if my assumptions are wrong.