This SaaS Forecast Estimator projects ending recurring revenue from a starting monthly recurring revenue base, expected monthly growth, and a forecast horizon. It also estimates the annualized run rate at the end of the period. The tool is designed for fast planning scenarios where a single compounded growth rate is acceptable. Real forecasts should separate new sales, expansion, contraction, and churn when those components are available.
1. Enter current MRR
Use recurring revenue for the most recent complete month.
2. Set net monthly growth
Enter the expected compounded change after new business, expansion, contraction, and churn.
3. Choose the horizon
Select the number of months to project.
4. Review the run rate
Compare ending MRR, annualized recurring revenue, and cumulative estimated monthly revenue.
5. Stress-test assumptions
Try lower and higher growth rates instead of relying on one point forecast.
The estimator compounds a constant net rate monthly. Cumulative period revenue is the sum of each projected month and does not include non-recurring revenue.
Use the main result together with the supporting metrics to compare scenarios and identify the assumptions with the largest effect.
The estimator compounds a constant net rate monthly. Cumulative period revenue is the sum of each projected month and does not include non-recurring revenue.
Given
Given: starting MRR of $100,000, net monthly growth of 5%, and 12 months.
Calculation
Ending MRR = $100,000 × 1.05^12 = $179,585.63. Ending ARR run rate = $179,585.63 × 12 = $2,155,027.56.
Result
MRR grows by about $79,585.63, reaching roughly 1.80 times the starting level.
Yes. Each month grows from the prior month’s projected MRR.
Yes, as long as it is greater than -100%. A negative rate represents net contraction.
It annualizes the ending month by multiplying MRR by 12. It is not the same as revenue actually earned during the forecast year.
No. Enter a net growth rate that already reflects churn and other recurring-revenue movements.
Use historical cohorts, pipeline, planned pricing changes, and churn expectations. Compare multiple scenarios because a constant rate is a simplification.