Subscription Business Churn Forecast Calculator

Churn rate and MRR forecasting for subscription businesses

Monthly churn rate is one of the most consequential numbers in a subscription business. It represents the percentage of monthly recurring revenue that is lost each month due to cancellations, downgrades, and non-renewals. A churn rate that appears small in isolation can have a dramatic compounding effect on revenue over time. A business with $50,000 in MRR and a 3 percent monthly churn rate loses $1,500 in revenue in the first month. If no new customers are added, by month 12 the MRR has fallen to approximately $34,200, a decline of 31.6 percent despite the seemingly modest 3 percent monthly rate. The compounding nature of churn is frequently underestimated.

Conversely, when new MRR is added each month, the net trajectory of revenue depends on whether new MRR exceeds churn-driven losses. At 3 percent monthly churn on $50,000 MRR, the first month's churn loss is $1,500. If $2,000 in new MRR is added, the net gain is $500 and MRR grows to $50,500. But in the next month, churn applies to the new higher base, so churn losses also grow. This creates a dynamic where the growth rate of new MRR must exceed the churn rate applied to the growing base for revenue to continue growing. Understanding the relationship between churn and new MRR acquisition is the foundation of subscription business modelling.

The breakeven new MRR requirement is the amount of new MRR that must be added each month just to keep MRR flat. It equals the current MRR multiplied by the monthly churn rate. At $50,000 MRR and 3 percent churn, breakeven requires adding at least $1,500 in new MRR every month. Any new MRR below this results in a shrinking revenue base; any new MRR above this results in growth. A business adding $2,000 per month against $1,500 in churn losses has a net MRR growth of $500, but this net growth slows as the base grows because churn losses also grow. At higher MRR levels, the same $2,000 monthly new MRR addition may no longer keep pace with churn.

Reducing churn vs increasing new MRR

In subscription businesses, reducing churn is typically more capital-efficient than acquiring new customers to compensate for churn. The cost of acquiring a new customer is often three to five times the cost of retaining an existing one, and retained customers have higher lifetime values because their revenue compounds over a longer period. A 1 percentage point reduction in monthly churn rate (from 3 percent to 2 percent) on a $50,000 MRR base reduces monthly churn losses from $1,500 to $1,000, a monthly saving of $500. Achieving the same net MRR improvement through acquisition would require finding $500 in additional new MRR per month, which might require significant additional marketing spend. Retention investment should be weighed against acquisition investment with the same analytical rigour.

Cohort analysis and churn benchmarks

Industry churn benchmarks vary significantly by market segment. B2B SaaS businesses typically target monthly churn rates below 1 to 2 percent, as enterprise customers tend to be stickier once integrated. B2C subscription products often see higher churn, with rates of 3 to 8 percent per month not uncommon for consumer apps and media subscriptions. Cohort analysis, which tracks the retention of customers who joined in the same month over time, provides insight into whether churn has improved or worsened over time and which acquisition channels produce higher-retention customers. A cohort that retains 80 percent of its initial MRR after 12 months is far more valuable than one that retains only 50 percent, even if both cohorts started at the same size.