Free SaaS calculator
SaaS Churn Calculator
Use this SaaS churn calculator to estimate revenue churn from lost recurring revenue. It helps founders see how much recurring revenue remains after cancellations or downgrades.
How to use this calculator
Enter starting MRR for the period you are measuring.
Enter the MRR lost to cancellations or downgrades.
Review revenue churn, retained MRR, and the annualized impact of lost MRR.
Calculator Inputs
Adjust assumptions and review the result.
Recurring revenue at the beginning of the period.
Recurring revenue lost from cancellations or downgrades.
Export or save this scenario for planning notes.
Revenue churn rate
5%
Churned MRR / starting MRR
Retained MRR
$23,750
MRR left after churn
Lost ARR run rate
$15,000
Annualized lost MRR
Interpret this result
Measured revenue loss
This scenario shows the percentage of recurring revenue lost from the starting base. Use it with acquisition and expansion metrics to understand whether the business is growing efficiently.
Assumption quality check
- The calculation assumes churned MRR belongs to the same period as starting MRR.
- Separate voluntary churn, involuntary churn, and downgrades when you need a deeper retention analysis.
Formula used
Revenue churn rate = Churned MRR / Starting MRR
Revenue churn rate
Churned MRR / Starting MRR x 100
Retained MRR
Starting MRR - Churned MRR
Lost ARR run rate
Churned MRR x 12
For broader model limits, read the Aura Revenue methodology.
Educational disclaimer
Aura Revenue provides educational forecasting tools and examples only. Outputs are estimates based on user-provided assumptions and should not be treated as financial, legal, tax, accounting, or investment advice.
Common mistakes to avoid
- Mixing customer churn with revenue churn without labeling the metric.
- Using ending MRR as the denominator instead of starting MRR.
- Ignoring downgrade/contraction revenue when measuring revenue churn.
Related resources
Next planning step
Use this result in a forecast workflow
A single metric is useful, but SaaS planning works best when revenue, churn, acquisition efficiency, and capital efficiency are reviewed together.
SaaS Churn FAQ
What is revenue churn?
Revenue churn measures recurring revenue lost during a period as a percentage of starting recurring revenue.
Should downgrades count as churned MRR?
For a simple revenue churn view, downgrades can be included as lost recurring revenue. More detailed reporting may separate contraction MRR from full cancellations.
Why does churn affect forecasts so much?
Churn lowers the revenue base that future growth compounds from, so small monthly changes can create large long-term differences.