Enterprise SaaS companies use this metric to evaluate the value add of their service if the pricing is based upon end user count. The calculation is simply the ARR or MRR divided by the active end user count. If a service is properly priced, the price per user seat will tell you the true cost of your solution for your customer. The greater the number of active end users the lower the cost per seat for the customer and this indicates a higher degree of engagement and a higher value add. Take special care in defining an active user as one would when doing so for the DAU/MAU calculation.