MRR (Monthly Recurring Revenue)
Starting off with the most obvious new metric to track: How much revenue can you predict on a monthly basis? If you offer a product portfolio of simple subscription plans you only need to calculate the amount of subscribers by the monthly plan price.
Number of subscribers x monthly plan price
However, this can become more complex depending on other billing components, e.g. if you offer subscription periods longer than a month, if you have a usage-based subscription or if you offer many different discounts. Important: one-time fees must not be considered in this calculation.
Why should you track MRR?
Forecasting: Obviously it will tell you how much revenue you can expect for the whole year.However, making a month-on-month comparison is even more useful. It helps you to directly measure your initiatives and their success. If the monthly revenue has significantly changed, you have most likely changed something in your offering. Did you gain or lose more customers than expected? MRR is one of the best metrics to evaluate your performance.