Revenue per customer (per month) = average order value multiplied by the number of orders.
Contribution margin per customer (per month) = revenue from customer minus variable costs associated with a customer. Variable costs include selling, administrative and any operational costs associated with serving the customer.
Avg. life span of customer (in months) = 1 / by your monthly churn.
LTV = Contribution margin from customer multiplied by the average lifespan of customer.
Monthly unit churn = lost customers/prior month total
Retention by cohort
Month 1 = 100% of installed base
Latest Month = % of original installed base that are still transacting