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SaaS Churn Rate Calculator
Project customer churn, ending subscribers, and recurring revenue using a monthly churn rate and new-customer estimate.
Quick math
Use this for quick arithmetic, percentages, or to check figures while filling in the main tool, without leaving the page.
Estimate
Projected ending MRR: 136,211 NOK
- Ending customers
- 454.0
- Starting MRR
- 150,000 NOK
- Ending MRR
- 136,211 NOK
- Ending ARR run rate
- 1,634,530 NOK
- Net MRR change
- -13,789 NOK
How this breaks down
- Estimated customers churned
- 286.0
- New customers added
- 240.0
- Projection period
- 12 months
- Monthly churn rate
- 5.0%
Simplified projection with constant monthly customer churn, new customer additions, and average revenue per customer. It does not model revenue churn or account upgrades and downgrades.
How to use this tool
- Use SaaS Churn Rate Calculator for the question described above, and check that the inputs match your records and time period.
- Enter starting customers.
- Enter monthly revenue per customer.
- Enter monthly customer churn.
- Enter new customers per month.
- Enter projection period.
- Change starting customers, monthly revenue per customer, monthly customer churn, new customers per month, projection period to compare scenarios, then check the units in the result.
Worked example with the prefilled values
This example shows how SaaS Churn Rate Calculator uses its starting values. Change the calculator inputs to estimate your own situation.
- Starting customers
- 500 customers
- Monthly revenue per customer
- 300 currency units
- Monthly customer churn
- 5 %
- New customers per month
- 20 customers
- Projection period
- 12 months
Projected ending MRR: 136,211 NOK
- Ending customers454.0
- Starting MRR150,000 NOK
- Ending MRR136,211 NOK
- Ending ARR run rate1,634,530 NOK
- Net MRR change-13,789 NOK
Simplified projection with constant monthly customer churn, new customer additions, and average revenue per customer. It does not model revenue churn or account upgrades and downgrades.
Formula and calculation logic
Each month: ending customers = starting customers × (1 − churn rate) + new customers
Ending MRR = ending customers × monthly revenue per customer
Ending ARR run rate = ending MRR × 12
Project customer churn, ending subscribers, and recurring revenue using a monthly churn rate and new-customer estimate.
Each month the model applies customer churn, adds new customers, and multiplies ending customers by average monthly revenue per account.
Assumptions
- Assumes constant monthly customer churn, new-customer additions, and average revenue per account. Cohorts, revenue churn, expansion, contraction, discounts, and one-time revenue are not modeled.
Published sources
Further reading for checking current rules and information. These links are not live inputs to the tool.
Questions about this tool
What does customer churn mean here?
It is the percentage of customers at the start of each month who cancel during that month.
How is revenue churn handled?
This model estimates customer churn only. It assumes fixed average revenue per account and does not model expansion or contraction revenue.
Can customers be fractional?
Yes. This is an expected-value projection, so fractional customer counts are possible.
Is this a forecast?
It is a scenario based on constant churn, acquisition, and average revenue inputs, not a forecast of actual results.