What Is Churn Rate? The Formula, a Worked Example, and Customer vs Revenue Churn

Every subscription business leaks customers. The question is how fast — and whether the leak is getting worse. Churn rate is the number that answers it: the percentage of customers who stop paying for a product or service during a given period. It is, in the words of one widely used definition, the complete opposite of the growth rate, which makes it one of the most important metrics for any business that lives on recurring revenue.

For a small business, churn is not an abstract SaaS metric. A gym loses members, a software tool loses subscribers, a meal-kit service loses weekly customers, a consultancy loses retainer clients. The maths is the same in every case, and a small change in the rate compounds brutally: lose 5% of your customers a month and you replace your entire customer base roughly every 20 months. Lose 2% and you have over four years.

What Is Churn Rate?

Churn rate (also called attrition rate or customer turnover) measures the proportion of customers or subscribers who leave a defined group during a specified period. For subscription businesses, it is the rate at which customers cancel or stop paying. It is usually expressed monthly, because monthly is the rhythm most subscriptions run on — but the same formula works for a quarter or a year, as long as you use the same period every time.

Churn is the inverse of retention. A 5% monthly churn rate means you kept 95% of your customers that month. That framing matters when you talk to a team about it: retention sounds like the goal, churn sounds like the problem, and they are the same number seen from opposite sides.

There are two kinds of churn, and confusing them is the most common mistake in the whole topic. Voluntary churn is customers choosing to leave — they cancel, they do not renew, they switch to a competitor. Involuntary churn is customers lost to failed payments: an expired card, a declined transaction, a bank flag. On the Recurly network, involuntary churn runs at about 1.06% a month in SaaS — roughly a third of total churn — and it falls to 0.18% for subscriptions billing over $250 a month. The fix for involuntary churn is entirely different from the fix for voluntary churn, so the first job is always to split the two apart.

How to Calculate Churn Rate: The Customer Formula

The basic customer churn formula is simple:

Customer churn rate = (customers lost during the period ÷ customers at the start of the period) × 100

Three rules keep the number honest. First, the denominator is the customers you had at the start of the period — not the end, not the average, and not the total including new signups. Second, do not count new customers acquired during the period in the starting count, and do not count customers who signed up and cancelled inside the same period: they were never in the starting base, so counting them inflates the rate. Third, pick one period and use it every time — monthly churn compared against quarterly churn is meaningless.

Worked example: a software company starts January with 500 customers. During January, 50 of those customers cancel. The churn rate is 50 ÷ 500 × 100 = 10%. The retention rate for the same month is 90%. If the company also signed up 80 new customers in January, those 80 are ignored in this calculation — they belong to February’s starting base, not January’s.

Annualising monthly churn is where most people go wrong. Do not multiply the monthly rate by 12. The correct conversion compounds it: annual churn rate = 1 − (1 − monthly churn rate)^12. A steady 5% monthly churn compounds to about 46% a year, not 60% — because each month’s churn applies to a shrinking base. The simple multiplication method significantly overstates the figure, and investors who know the maths will notice.

Customer Churn vs Revenue Churn

Customer churn counts people. Revenue churn counts money. They diverge whenever your customers are not all worth the same amount — which is almost always.

Revenue churn rate = (recurring revenue lost during the period ÷ recurring revenue at the start of the period) × 100

Only count revenue from the customers you had at the start of the period. If a $50-a-month customer and a $5,000-a-month customer both cancel, customer churn counts them equally — one each. Revenue churn counts the $5,000 customer a hundred times more heavily, which is the honest picture of what the business just lost.

There are two versions of revenue churn. Gross revenue churn counts only what was lost — cancellations and downgrades. Net revenue churn subtracts expansion revenue (existing customers upgrading or buying more) from the loss, so it can go negative. Negative net revenue churn means your remaining customers are spending more than the churned ones took away, which is the hallmark of a healthy subscription business: SaaS Capital’s 2026 survey of private B2B SaaS companies found median net revenue retention of 103%, meaning the typical company in that survey grew revenue from its existing base even after churn.

A related number worth knowing is customer lifetime value, which falls straight out of the churn rate: LTV = average revenue per customer ÷ monthly churn rate. At $50 a month per customer and 5% monthly churn, the average customer is worth $1,000 over their lifetime. Cut churn to 2.5% and the same customer is worth $2,000 — without acquiring a single new one. That is why retention work usually pays better than acquisition work.

What Is a Good Churn Rate in 2026?

There is no single good number — it depends on the market, the price, and whether the customer is a business or a consumer. But the 2026 benchmarks give a useful frame. Recurly’s network data from July 2026 puts median total churn for SaaS businesses at 3.22% a month, with the top quartile holding churn at 1.78% or below. B2B software voluntary churn sits near 3.36% a month, against about 4% for B2C software, with involuntary churn adding roughly another 1 to 1.7 points on top. B2C-oriented subscriptions overall average around 6.5% a month, and the cheapest plans churn hardest: Recurly’s data shows 4.29% total churn for plans billing $10 to $25 a month, falling to 2.87% at $100 to $250.

The pattern behind the numbers is consistent. Enterprise software, with long contracts and high switching costs, aims for monthly churn below 1% — annualised, under 10%. Small-business SaaS typically lives between 3% and 7% a month. Consumer subscriptions run higher still. What matters more than the absolute number is the direction: churn that is falling quarter by quarter is a healthy business even if the level is still high, and churn that is creeping up is a warning even if the level looks fine today.

Two traps deserve a mention. First, never compare your monthly churn against someone else’s annual churn — Recurly itself labels some of its figures inconsistently, and mixing periods is the easiest way to fool yourself. Second, free trial users who never convert are not churn; they were never paying customers, so they belong nowhere in the calculation.

Why Customers Actually Leave

The reasons cluster into a handful of groups, and each one points at a different fix. Price is the most cited: Recurly’s research found 71% of companies naming price increases as the number-one driver of customer loss. But “price” usually means “the value stopped justifying the price” — a customer who uses the product daily rarely churns over a small increase, while a customer who barely logs in churns over almost any increase.

The second group is failed onboarding. RevenueCat’s 2026 data found that 35% of annual subscriptions are cancelled in the first month. The first 30 days are where churn is won or lost: if a customer has not reached their first success with the product before the first renewal, the cancellation is almost a formality. The third group is failed payments — the involuntary churn covered above — which is the only kind of churn you can fix without changing the product at all. The fourth is genuine fit: the customer outgrew the product, their business closed, or their needs changed. Some churn is unavoidable, and chasing zero churn wastes effort that belongs elsewhere.

How to Reduce Churn Rate

Start with the cheapest wins, in this order.

Fix failed payments first. Add automatic card updating so expired cards refresh without the customer doing anything, retry failed charges intelligently over several days instead of once, and send a clear dunning email the moment a payment fails. Recurly’s data suggests fixing involuntary churn can lift revenue by 8.6% in the first year — and none of it requires touching the product.

Win the first 30 days. Map the single action that separates customers who stay from customers who leave — the “activation moment” — and design onboarding to get every new customer there fast. A welcome sequence, a short setup call for higher-value plans, and a check-in before the first renewal all belong here.

Watch the warning signs. Customers rarely cancel without signalling first: logins drop, usage falls, support tickets turn frustrated, invoices go unpaid. A simple CRM that flags accounts whose usage has fallen by half in a month gives you a list to call before the cancellation arrives. If you do not have one yet, our guide to how much a CRM costs for a small business puts real 2026 prices against team size.

Save the ones you can, cheaply. An exit survey on the cancellation page, a pause-instead-of-cancel option, and a downgrade path instead of a hard cancel all recover a share of leavers at almost no cost. The customers you save this way are also the ones most likely to come back later.

Raise value before you raise price. If a price increase is coming, ship the improvement first and announce the increase second, with the new value front and centre. Customers accept paying more for something that got better; they churn over paying more for something that stayed the same.

None of this is exotic. The businesses with the lowest churn are usually the ones that measure it properly, split voluntary from involuntary, and work the list every month instead of discovering the leak in a quarterly review.

Churn and the Rest of the Business

Churn does not live alone. It is the other side of burn rate and runway: a startup that loses 5% of its customers a month needs to replace them just to stand still, and the acquisition cost of those replacements is what eats the cash. Read our guide to burn rate and runway to see how the two numbers interact in a cash forecast. It also shapes fundraising: investors read churn as a verdict on the product, and pre-seed vs seed funding conversations go very differently for a company with 2% monthly churn than for one with 8%. A founder who can show churn falling over four quarters has a stronger story than one who can only show growth — because growth bought with churn is growth that has to be bought again next month.

The Bottom Line

Churn rate is the percentage of customers you lose in a period: customers lost divided by customers at the start, times 100. Revenue churn applies the same maths to money, and net revenue churn nets off expansion from existing customers. A good SaaS benchmark for 2026 is around 3.2% a month, with the top quartile at 1.78% or below — but the number that matters most is your own trend, split into voluntary and involuntary, measured the same way every month. Fix failed payments first, win the first 30 days, and remember the arithmetic: at $50 a month, cutting churn from 5% to 2.5% doubles the lifetime value of every customer you already have.

Sources (text only, no links): Recurly churn rate benchmarks, July 2026 network data; SaaS Capital 2026 survey of private B2B SaaS companies; RevenueCat 2026 subscription retention report; Ahrefs churn rate guide; Stripe churn rate guide.

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