How many leads do you have in your sales funnel?
How much does it cost for you to acquire each lead?
What is your conversion rate from leads to paying customers?
How much do your customers pay you?
(per month / per contract / per unit)
What is the average number of recurring transactions per customer?
(expected within 3 year lifecycle)
What is your cost of sale
(any marginal costs associated with sales of your product)