Calculator Tools
Churn Rate Calculator
Calculate monthly, quarterly, or annual churn rate, GRR, NRR, and net new MRR. Customer and revenue churn with annualized projection.
Period
Pick the cadence you measure on. The math is identical; period only changes how the recurring revenue is labeled (MRR) and whether the annualized projection is shown.
Quick examples
Inputs for the period
Customers
Active paid customers at the start of the month.
From the starting cohort. Do not include new sign-ups that also cancelled in the period unless you measure that way.
Used for the ending count and the net new figure. New customers do not affect the churn rate itself.
Revenue (MRR)
Display only. Use $, €, £, or anything short.
Recurring revenue from the existing customer book at the start of the period.
Recurring revenue from customers who cancelled.
Revenue lost when customers reduced their plan or seats but did not cancel.
Upsells, cross-sells, seat or usage increases from the existing book. Drives NRR above 100%.
Recurring revenue from brand-new customers. Excluded from GRR and NRR by definition.
Churn rate (month)
3.00%
customer churn (30 of 1,000)
Revenue retention
GRR
95.20%
NRR
100.00%
Revenue churn rates
Gross
4.80%
Net
0%
Net new MRR
+$4,000
new + expansion - lost - downgrade
Period breakdown
How the month closed across the existing book and the new business added.
| Movement | Customers | MRR |
|---|---|---|
| Start of period | 1,000 | $50,000 |
| Cancellations | -30 | -$1,800 |
| Downgrades | 0 | -$600 |
| Expansion | 0 | +$2,400 |
| Existing book at end | 970 | $50,000 |
| New customers | +60 | +$4,000 |
| End of period (with new) | 1,030 | $54,000 |
Annualized projection
If the current monthly rate held for a full year. Compounded uses the standard SaaS formula 1 - (1 - r)^12 that accounts for the shrinking cohort each month. Simple is the naive 12x figure some boards still quote.
| Metric | Per month | Annual (compounded) | Annual (simple x12) |
|---|---|---|---|
| Customer churn | 3.00% | 30.62% | 36.00% |
| Gross revenue churn | 4.80% | 44.58% | 57.60% |
| Net revenue churn | 0% | 0% | 0% |
Annualized projections assume a steady rate. Real businesses change month to month, so treat these as a trend line, not a forecast.
Formulas used
Customer churn rate = lost customers / starting customers
Customer retention rate = 1 - customer churn rate
Gross revenue churn = (lost MRR + downgrade MRR) / starting MRR
Net revenue churn = (lost MRR + downgrade MRR - expansion MRR) / starting MRR
Gross revenue retention (GRR) = 1 - gross revenue churn
Net revenue retention (NRR) = 1 - net revenue churn
Net new MRR = new + expansion - lost - downgrade
Standard SaaS metric definitions. NRR and GRR exclude new business by design, so a healthy book with growing seats can show NRR above 100% even before counting sign-ups.
How to use
- Pick a period: Monthly, Quarterly, or Annual. The math is the same; the period only changes the revenue label (MRR, QRR, ARR) and whether the annualized projection shows.
- Enter starting customers, lost customers (cancellations from the starting cohort), and new sign-ups during the period.
- Enter starting recurring revenue, lost revenue, downgrade revenue, expansion revenue, and new revenue. Leave a field at zero if it does not apply.
- Read customer churn, GRR, NRR, gross and net revenue churn, and net new revenue in the result panel. Negative churn is highlighted in green.
- Open the period breakdown to see how the book closed and the annualized projection to compare compounded vs. simple yearly rates.
- Tap Copy summary to paste a clean text report into a board deck, investor update, or QBR.
About this tool
Churn Rate Calculator turns the customer movement and recurring revenue numbers you already track into the full SaaS retention picture in one pass. Pick a period (monthly, quarterly, or annual), then enter starting customers, lost customers, new sign-ups, starting recurring revenue (MRR, QRR, or ARR), lost revenue, downgrade revenue, expansion revenue, and new revenue. The tool returns customer churn rate, customer retention rate, gross revenue churn rate, net revenue churn rate, gross revenue retention (GRR), net revenue retention (NRR), and net new MRR, all on the same screen. A period breakdown table walks through how the book closed: starting balance, cancellations, downgrades, expansion, ending existing book, new customers and revenue, and the final end-of-period numbers. An annualized projection panel converts the period rate into both compounded (1 - (1 - r)^n, the standard SaaS smoothing) and simple (rate times periods per year) annual figures, so you can quote the version your board or investor expects without reaching for a spreadsheet. Negative churn (when expansion exceeds lost plus downgrade) is detected and highlighted, which matters because best-in-class SaaS books often run there. A formula reference card explains every metric in plain English so a new analyst or operator can defend the numbers in a review. Useful for monthly board snapshots, investor data rooms, quarterly business reviews, pricing experiments, retention deep dives, customer success scorecards, and benchmarking against published GRR and NRR ranges. All math runs locally in your browser, so the cohort and revenue figures you type stay on your device. This calculator implements standard SaaS metric definitions; consult your finance team for GAAP and audit-grade reporting.
Free to use. Works in your browser. No signup, no login.
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