# What is Time to payback CAC?

Time to payback CAC (also called CAC payback period) is a metric showing the number of months needed to get back the money you’ve invested in customer acquisition and you spend to service the customer.

## How to calculate CAC?

$CAC=\frac{Customer&space;Acquisition&space;Cost}{(Monthly&space;Recurring&space;Rate&space;-&space;Average&space;Cost&space;of&space;Service))}$