#979 · Startup Tool

Investor Churn Calculator

Evaluate churn, gross revenue churn, and net revenue retention from an investor perspective. Use it to identify retention risk, revenue durability, and diligence red flags.

Calculator

Startup assumptions
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How to use this calculator

  • Enter starting customer count.
  • Enter customers lost during the period.
  • Enter starting MRR.
  • Add expansion MRR from retained customers.

What the result means

Churn tells investors how durable the revenue base is. Strong NRR can offset churn and indicate that existing accounts are expanding.

Customer churn = churned customers ÷ starting customers. Estimated NRR = (starting MRR - estimated churned MRR + expansion MRR) ÷ starting MRR.

For exact revenue churn, use actual churned MRR. This calculator estimates churned MRR from customer churn when only customer count is available.

Example calculation

Starting with 500 customers and losing 25 gives 5% customer churn. If starting MRR is $120,000 and expansion is $18,000, estimated NRR is 110%.

Tips for better results

  • Analyze churn by segment and acquisition channel.
  • Compare logo churn and revenue churn separately.
  • Track expansion revenue because it can offset lost accounts.
  • Investigate churn concentration in large customers.

FAQ

What churn rate is acceptable for SaaS investors?

Acceptable churn depends on segment, but investors generally prefer low logo churn and NRR above 100%.

How does churn affect startup valuation?

High churn reduces revenue durability, increases replacement cost, and can lower the valuation multiple.

What is the difference between churn and NRR?

Churn measures lost customers or revenue, while NRR measures retained revenue plus expansion after churn.

Why do investors care about gross revenue retention?

Gross revenue retention shows how much revenue remains before expansion, revealing the true durability of the customer base.

Can high expansion revenue hide churn problems?

Yes. Strong expansion can lift NRR while underlying logo churn remains high, so both metrics should be reviewed.

Startup decision modules

ModuleWhat it shows
Churn SummaryCustomer churn and estimated revenue retention.
NRR DashboardNet retention after churn and expansion.
Risk IndicatorRetention risk from an investor perspective.
Diligence NotesWhat to investigate before investment.

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