Churn Rate Calculator — Customer, Gross MRR, Net MRR
Three churn measures: customer churn, gross MRR churn, and net MRR churn with expansion offset. Net below zero means growth without any new sales.
Churn Rate Calculator (Customer + MRR)
Customer churn
3.00%
Gross MRR churn
3.50%
Net MRR churn
2.30%
For SMB SaaS, monthly churn <5% is good, <2% is excellent. Net MRR churn < 0% = "negative churn" = expansion revenue from existing customers beats cancellations. The best SaaS metric in the world.
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Calculate customer, gross MRR and net MRR churn
Enter your starting customers or MRR, what you lost, and any expansion revenue to get the three churn rates SaaS teams actually track — customer churn, gross MRR churn and net MRR churn — plus the retention figures that mirror them.
The formulas
- Customer churn = customers lost ÷ customers at the start.
- Gross MRR churn = (MRR lost to cancellations + downgrades) ÷ starting MRR.
- Net MRR churn = (MRR lost − expansion MRR) ÷ starting MRR. When expansion outweighs losses this goes negative — "negative churn," the holy grail.
Why net churn matters most
Gross churn shows how much you're leaking; net churn shows whether your existing base grows on its own. A business with negative net churn compounds revenue even if it stops adding new customers. Everything is computed in your browser.
Churn is one half of lifetime value and the half that decides it — a small change in retention moves LTV far more than a change in price. The LTV calculator does that arithmetic.
How to use the Churn Rate Calculator (Customer + MRR)
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the Churn Rate Calculator (Customer + MRR) above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the Churn Rate Calculator (Customer + MRR).
What is the difference between customer churn and MRR churn?
Customer churn counts departures; MRR churn measures the revenue that left with them. They can point in opposite directions — losing several small accounts and keeping a large one looks bad on customer churn and fine on revenue churn, and the reverse is worse. Reading only one of them hides which kind of customer you are losing.
What does net MRR churn below zero mean?
That expansion from existing customers exceeded the revenue lost from departures, so revenue grew without a single new sale. It is the strongest signal a subscription business can show, because it means the existing base is compounding on its own rather than needing acquisition to stand still.
Which measure should I report?
More than one, and say which is which. Reporting a single churn number invites the reader to assume a definition, and the three here can differ substantially on the same month. Consistency over time also matters more than the choice — changing definition between reports makes a trend meaningless.
Why does the period matter?
Because a monthly rate and an annual rate are not interchangeable and do not scale by twelve. A small monthly figure compounds into a much larger annual loss, so quoting a monthly rate where an annual one is expected understates the problem considerably. State the period every time.
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