TL;DR
Churn rate is customers (or revenue) lost during a period divided by the starting count, multiplied by 100. Monthly churn compounds — 5 percent monthly annualizes to 46 percent, not 60 percent. Customer churn rate counts logos; revenue churn rate counts ARR or MRR. 2026 benchmarks: SMB 3 to 5 percent monthly, Mid-Market 1 to 2 percent, Enterprise 0.5 to 1 percent.
Definition
Churn rate is the most misreported metric in subscription business reporting. The arithmetic is simple, but the labels around the number are where the errors compound. A founder who says "our churn is 5 percent" without specifying period, basis, and inclusion rules is producing a number that the board cannot use. The same 5 percent could mean 5 percent monthly customer churn (which annualizes to 46 percent), 5 percent annual revenue churn (which is best-in-class enterprise), or 5 percent gross including involuntary (which overstates the voluntary problem).
The discipline is in the labels, not the math. Every churn figure needs three labels: period (monthly, quarterly, annual), basis (customer count or revenue), and inclusion rule (voluntary, involuntary, or gross). Without all three, the number is anecdotal. The team that locks these definitions stops fighting about churn in the board meeting and starts using it as the operating compass it was designed to be.
How to calculate churn rate
The base formula is identical for monthly and annual churn. The denominator is the starting count of customers (or starting revenue) for the period. The numerator is the count (or revenue) lost during the period. Multiply by 100 to express as a percentage.
Monthly customer churn
Customers lost / customers at start of month
12 / 500 = 2.4%
Annual customer churn
Customers lost / customers at start of year
90 / 500 = 18%
Monthly revenue churn
MRR lost / MRR at start of month
6,000 / 200,000 = 3%
Net revenue churn
(Churned ARR + Contraction) - Expansion / Starting ARR
Can be negative when expansion exceeds churn
The mid-period customer rule matters. Customers added during the period should not appear in the denominator of the churn calculation for that period. The denominator is the count at the start, not the average count, not the end count. A team that includes mid-period new customers in the denominator artificially deflates the churn rate.
The compounding trap
The single biggest churn reporting error in SaaS is multiplying monthly churn by 12 to produce an "annual" number. The math does not work because churn compounds. Each month the denominator shrinks. The same percentage applied to a shrinking base produces a smaller absolute loss every month, and the cumulative loss over 12 months is less than 12 times the monthly loss.
The correct annualization formula is: annual churn rate equals 1 minus (1 minus monthly churn rate) raised to the 12th power. For a 5 percent monthly churn rate, the math is 1 minus (0.95 to the 12th), which equals 45.96 percent. Not 60 percent. The straight-line method overstates annual churn by roughly 14 percentage points when monthly churn is 5 percent. The gap grows as monthly churn grows.
Monthly: 1%
×12 = 12%
Actual: 11.4%
Monthly: 3%
×12 = 36%
Actual: 30.6%
Monthly: 5%
×12 = 60%
Actual: 46%
Monthly: 7%
×12 = 84%
Actual: 58%
Monthly: 10%
×12 = 120%
Actual: 71.8%
Benchmarks 2026
Churn rate benchmarks vary by customer segment, ACV band, and contract length. Annual contracts produce structurally lower monthly churn than month-to-month contracts because customers cannot cancel between renewal dates. The benchmarks below combine Bessemer State of the Cloud data, OpenView Partners SaaS benchmarks, and public S-1 disclosures from category-leading SaaS companies.
SMB SaaS
Monthly churn: 3 to 5%
Annual (compounded): 35 to 46%
Best-in-class NRR: 105 to 115%
Mid-Market
Monthly churn: 1 to 2%
Annual (compounded): 12 to 22%
Best-in-class NRR: 115 to 125%
Enterprise
Monthly churn: 0.5 to 1%
Annual (compounded): 6 to 12%
Best-in-class NRR: 120 to 140%
PLG / Self-Serve
Monthly churn: 5 to 7%
Annual (compounded): 46 to 58%
Best-in-class NRR: 100 to 110%
See it in the product
Churn rate — tracked in a real Gangly workflow.
Gangly surfaces churn risk signals so reps act before the renewal window closes. No post-hoc reporting. No surprises.
Frequently asked questions
What is churn rate in simple terms?
Churn rate is the percentage of customers or revenue that a business loses during a defined period. A 4 percent monthly customer churn rate means 4 out of every 100 customers at the start of the month cancelled by the end of the month. Churn rate can be expressed monthly, quarterly, or annually, and it can be measured by customer count or by revenue.
How do you calculate monthly churn rate?
Monthly churn rate equals customers lost during the month divided by customers at the start of the month, multiplied by 100. If a SaaS team starts the month with 500 customers and loses 12 by month end, the monthly churn rate is 2.4 percent. The same formula applies to revenue: revenue lost during the month divided by revenue at the start of the month.
Does 5 percent monthly churn equal 60 percent annual churn?
No. Monthly churn compounds. A 5 percent monthly churn rate annualizes to 1 minus 0.95 raised to the 12th power, which equals approximately 46 percent annual churn. Multiplying 5 percent by 12 to get 60 percent overstates the actual annual churn rate by roughly 14 percentage points. This is the single most common churn reporting error in SaaS.
What is the difference between customer churn and revenue churn?
Customer churn rate counts logos. Revenue churn rate counts dollars. A team can have 5 percent customer churn but only 1 percent revenue churn if the customers who leave are small. Conversely, losing one large enterprise account can spike revenue churn while customer churn stays flat. Both numbers belong on the board pack.
What is a good monthly churn rate for SaaS in 2026?
Bessemer State of the Cloud benchmarks suggest 3 to 5 percent monthly for SMB SaaS, 1 to 2 percent monthly for mid-market, and 0.5 to 1 percent monthly for enterprise. Best-in-class companies report net negative churn, which means expansion revenue from existing customers exceeds churn revenue, producing Net Revenue Retention above 100 percent.
Should I include involuntary churn from billing failures?
Report it separately. Involuntary churn from failed credit cards, expired payment methods, or processor errors is recoverable through dunning and card update services. Mixing it with voluntary churn inflates the apparent retention problem. Best practice is to publish a gross churn number, a voluntary churn number, and an involuntary churn number on the same dashboard.
Is a rising churn rate always bad?
Not always. A rising churn rate is a problem when Net Revenue Retention is falling. It is not a problem when the team is intentionally trimming low-fit accounts to free capacity for higher-ACV segments. The diagnostic question is whether revenue churn is rising alongside customer churn and whether NRR has dropped below 100 percent.