At the end of every month, I calculate my user growth rate in a google sheet.
Tracking user growth helps me understand how effective my marketing strategies are on a monthly basis.
Here's the calculation I use to track user growth rate
Latest Months User # - Previous Months User # / Latest Months User # x 100
3600 - 560 / 3702 x 100 = 561.07%
January '20 = 184
February '20 = 401 (+117.93%)
March '20 = 560 (+39.65%)
April '20 = 3702 (+561.07%)
Average Growth Rate = (+239.55%)