​​List Growth Rate refers to a metric that measures the rate at which a contact list (e.g., email subscribers, leads) grows over a specific period. The list growth rate is calculated by comparing the number of new contacts added to the list against unsubscribes or opt-outs.

Formula For List Growth Rate 

Subtracting new subscribers from unsubscribe and then dividing by the total number of subscribers the t start. Multiply by 100 

List Growth Rate (%) =  (New Subscribers−Unsubscribes​)(Divided By)(Total Subscribers at Start) ×100

Parameters 

New Subscribers= The number of new people who joined your list in a specific period.

Unsubscribes= People who left your list in that same period.

Total Subscribers at Start= The number of subscribers at the beginning of the period.

A high list growth rate indicates lead generation and audience engagement strategies.