Customer Lifetime Value Calculator (CLV)    
  CLV Inputs  
Average Selling Price (annual in $) [1]  
Average Gross Margin on Sale [2]  
Average number of years a customer is retained [3]  
Upsell potential in future years [4]  
Discount Rate (future money is worth less than money today) [5]  
Customer Lifetime Value (CLV)  
[1] Note that this is an annual Average Selling Price per customer.
[2] Your gross margin, excluding fixed and overhead expenses.
[3] The number of years of your typical customer engagement.
[4] This is an estimate of how much you could upsell your customers each year of your relationship.
[5] If you're not sure, use 15% as a good starting point.