MRR Forecasting Tool

What is this?

MRR (Monthly Recurring Revenue) forecasting models your future revenue by applying growth, churn, and expansion rates to your current MRR. New MRR comes from acquiring new customers, churned MRR is lost from cancellations, and expansion MRR comes from upsells and upgrades. The net of these three forces determines your revenue trajectory. This is the most common model used by SaaS companies for planning and fundraising.

Why it matters

Accurate MRR forecasting helps you plan hiring, set fundraising targets, and identify when you will hit key revenue milestones. Investors use MRR projections to evaluate deal attractiveness — showing a clear path to $1M ARR or $100K MRR demonstrates product-market fit momentum. Forecasting also reveals the compounding impact of small improvements: reducing churn by 1% can dramatically change your 12-month outlook.

How to use this calculator

Enter your current MRR, monthly new customer growth rate, monthly churn rate, and monthly expansion rate (from upsells/upgrades). Set the forecast horizon (up to 36 months). The calculator projects your MRR month by month, showing milestones at 6, 12, and 24 months, plus the ARR equivalent. Experiment with different churn and growth scenarios to see how they compound.