Churn Rate Calculator
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This churn rate calculator shows what share of your customers left during a period. Enter customers at the start of the period and customers lost to get your churn rate as a percentage. It suits SaaS founders, subscription businesses, agencies and customer success teams. It is free, runs in your browser and needs no sign-up.
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Divides customers lost by starting customers, then adds retention rate, annualized churn and average customer lifetime.
Works for a month, a quarter or a year, as long as both numbers cover the same period.
Enter starting MRR and lost MRR instead of customer counts to get a revenue churn rate.
Runs in your browser with no sign-up, so you can check churn for each month or segment.
Three steps from a blank form to a result you can use.
Add the number of paying customers you had on the first day of the period you want to measure.
Add how many of those starting customers cancelled or did not renew during the same period.
See your churn rate with retention rate, annualized churn and average customer lifetime in periods.
Churn rate is the share of customers who stop paying you in a set period. It is one of the clearest signals of whether customers find lasting value in what you sell.
Do not add customers who joined during the period to either field. The formula measures what happened to the customers you started with.
The calculator uses the standard customer churn formula, the same one given by Amplitude and Omni Calculator:
Churn rate (%) = Customers lost during period ÷ Customers at start of period × 100 Retention rate (%) = 100 - churn rate Annualized churn (if monthly) = 1 - (1 - churn rate)^12 Average customer lifetime (periods) = 100 ÷ churn rate
Example: A subscription service starts March with 400 paying customers. During March, 18 of them cancel. Churn rate is 18 ÷ 400 × 100 = 4.5% for the month, so retention rate is 100 - 4.5 = 95.5%. Annualized churn is 1 - (1 - 0.045)^12 = about 42.5%. Average customer lifetime is 100 ÷ 4.5 = about 22.2 periods, here months, which matches Omni Calculator's 1 ÷ churn rate. These figures are an illustration, not a benchmark.
New customers who signed up in March are left out. Amplitude treats acquisition as a separate factor to look at next to churn. Mixing the two hides churn, because strong sign-ups can make a leaking customer base look healthy.
Monthly churn does not turn into annual churn by multiplying by 12. Each month's losses come from a smaller base, so the effect compounds. Churnkey gives this conversion, and the calculator shows it as Annualized churn (if monthly). It compounds your rate over 12 periods, so read that row only when your period is one month:
Annual churn = 1 - (1 - Monthly churn)^12
| Monthly churn | Annual churn (compounded) | Simple × 12 |
|---|---|---|
| 1% | 11.4% | 12% |
| 2% | 21.5% | 24% |
| 3% | 30.6% | 36% |
| 5% | 46.0% | 60% |
| 10% | 71.8% | 120% |
Churnkey notes that multiplying by 12 is a rough estimate that only holds up at low rates of about 1 to 3%. At 10% monthly churn the shortcut gives an impossible 120%. We suggest always using the compounded figure when you report annual churn.
Customer churn counts people. Revenue churn counts money. Amplitude explains that revenue churn uses the same formula with revenue in place of customer counts, usually monthly recurring revenue (MRR).
| Metric | Formula | What it tells you |
|---|---|---|
| Customer churn | Customers lost ÷ customers at start × 100 | How many customers are leaving |
| Revenue churn | MRR lost ÷ MRR at start × 100 | How much recurring revenue is leaving |
The two can tell very different stories. Losing five small accounts and losing one large account may give the same revenue churn but very different customer churn. Amplitude's own example: a business starts May with $10,000 in MRR and loses two customers paying $500 each. Revenue churn is $1,000 ÷ $10,000 × 100 = 10%. You can use this calculator for revenue churn by entering starting MRR in the first field and lost MRR in the second.
Amplitude advises picking a period that matches how often customers use your product, and looking at more than one timeframe. A monthly subscription suits monthly churn. Annual contracts suit quarterly or annual churn, because almost nobody can leave in a month when renewals come once a year.
| Business model | Period we suggest | Why |
|---|---|---|
| Monthly SaaS or membership | Monthly | Customers can cancel every billing cycle |
| Annual contracts | Quarterly or annual | Losses cluster around renewal dates |
| Agency retainers | Quarterly | Small client counts make monthly numbers jumpy |
A single churn rate for the whole business can hide where the problem sits. Run the calculator for each plan, sales channel or signup month. If newer customers leave faster than long-standing ones, a blended rate can look stable while recent cohorts quietly drain away. Once you know which segment churns most, you know where to spend onboarding and support time first.
Quick answers about the Churn Rate Calculator.
Divide the number of customers lost during a period by the number of customers at the start of that period, then multiply by 100. If you start a month with 500 customers and lose 25, churn is 25 ÷ 500 × 100 = 5%. Leave out customers who joined during the period.
There is no single good churn rate. It depends on your market, price and contract length. Amplitude notes that churn varies widely between SaaS companies and advises against leaning on outside benchmarks. Omni Calculator simply says the closer to zero the better. We suggest tracking your own trend month by month.
Use the compounding formula: annual churn equals 1 minus (1 minus monthly churn) to the power of 12. At 5% monthly churn, annual churn is about 46%, not 60%. Multiplying by 12 only gives a rough estimate at low monthly rates of around 1 to 3%.
No. The standard formula uses customers at the start of the period as the base and counts only how many of them left. New customers who joined during the period are left out. Track new customer growth as a separate number so strong sign-ups do not hide a churn problem.
Customer churn measures the share of customers who left. Revenue churn measures the share of recurring revenue lost, using lost MRR divided by starting MRR. If your biggest accounts leave, revenue churn can be much higher than customer churn. Tracking both gives a fuller picture of retention.
Yes. The churn rate calculator is free and needs no account or sign-up. It runs in your browser. Enter customers at the start of the period and customers lost to get your churn rate. You can also enter starting and lost MRR to calculate revenue churn instead.
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