SaaS MRR Growth Calculator
Forecast your MRR and ARR run rate over the next 12 months from monthly new, expansion and churned MRR.
Monthly MRR movements
12-month forecast
MRR after 12 months
Enter your MRR movements to see the forecast.
The four levers of SaaS MRR growth
New MRR, expansion MRR, contraction MRR and churned MRR are the four numbers that decide where your ARR ends up. Many growth-stage SaaS companies find that expansion MRR, driven by upsells, extra seats and tier upgrades, eventually rivals or exceeds new MRR. Companies that ignore expansion and churn end up filling a leaky bucket.
How the forecast works
The calculator adds new and expansion MRR, subtracts churned MRR, and applies that net change every month for 12 months. It assumes your monthly movements stay flat, which makes it a quick baseline rather than a full model. In practice churn usually grows as your customer base grows, so rerun the forecast with updated numbers each quarter.
The ARR run rate is simply month 12 MRR multiplied by 12.
Frequently asked questions
What monthly MRR growth rate is healthy?
It depends heavily on stage. Early-stage SaaS companies often grow 15 to 20% a month from a small base, mid-stage companies 10 to 15%, and mature companies closer to 3 to 5%. Compare yourself with companies at a similar size.
Where does contraction MRR go?
Add downgrades to the churned MRR field. Both reduce revenue from existing customers, and combining them keeps the forecast simple.