This article provides general educational information about churn rate calculation and does not constitute financial or business advice. Churn rate measures the proportion of customers or recurring revenue lost over a defined period and is widely used to assess retention in subscription businesses. This guide explains the standard formulas for customer and revenue churn, how the two differ, and walks through hypothetical worked examples that illustrate how each calculation is applied.
1. What Churn Rate Measures
Churn rate, also called attrition rate, quantifies the share of a starting base that is lost during a measurement window. For subscription businesses, the base is typically either the count of active customers at the start of the period or the amount of recurring revenue at the start of the period. The result is expressed as a percentage and reflects retention dynamics over that interval only.
A low churn rate indicates that most of the starting base remained subscribed through the period, while a higher churn rate indicates a larger share was lost. Churn does not measure new customer acquisition or expansion revenue on its own; it isolates loss from the starting cohort. Like any single metric, churn is most informative when evaluated alongside acquisition, expansion, and overall net retention.
Churn is always measured against a defined starting base and a fixed period (e.g., month, quarter, year). This example assumes a monthly period unless stated otherwise, and this calculator estimates churn using the same period-bound approach.
2. Customer Churn Rate Formula
Customer churn, often called logo churn, divides the number of customers who cancelled or failed to renew in the period by the number of customers active at the start of the period. New customers added during the period are not included in the denominator, because they were not at risk of churning at the start.
Customer Churn Rate = (Customers Lost in Period ÷ Customers at Start of Period) × 100
Where:
• Customers Lost = Subscriptions that cancelled or did not renew during the period
• Customers at Start = Active paying customers on day one of the period
• New customers added mid-period are excluded from the denominatorSome organizations use an adjusted denominator, such as the average of starting and ending customers, to smooth for intra-period growth. The simple start-of-period method described above is the most widely cited standard and the one this calculator estimates by default. Whichever denominator is chosen should be applied consistently across periods for comparability.
3. Revenue Churn Rate Formula
Revenue churn measures the proportion of recurring revenue lost from the starting base, rather than the count of logos. It captures contraction and cancellation in dollar terms. Gross revenue churn isolates losses, while net revenue churn offsets losses with expansion from the same cohort.
Gross Revenue Churn Rate = (MRR Churned + MRR Contraction in Period ÷ MRR at Start of Period) × 100
Net Revenue Churn Rate = (MRR Churned + MRR Contraction − MRR Expansion in Period ÷ MRR at Start of Period) × 100
Where:
• MRR Churned = Recurring revenue from customers who cancelled
• MRR Contraction = Revenue lost from downgrades in the retained cohort
• MRR Expansion = Additional revenue from upsells or cross-sells in the retained cohort (net churn only)Gross revenue churn cannot be negative, because it only counts losses. Net revenue churn can be negative when expansion in the retained cohort exceeds losses in the same period. Both figures are estimates based on the recurring revenue included in MRR; one-time fees and non-recurring charges are excluded from the inputs.
4. Customer vs Revenue Churn: When Each Matters
Customer and revenue churn can diverge materially, especially when account sizes vary. The table below summarizes how each type is defined and when it is typically reviewed.
| Dimension | Customer (Logo) Churn | Revenue Churn |
|---|---|---|
| What it counts | Number of customers lost | Dollars of MRR lost |
| Formula base | Customers at start of period | MRR at start of period |
| Sensitive to account size | No — every logo counts equally | Yes — larger accounts weigh more |
| Can be negative | No | Net revenue churn can be negative with expansion |
| Best signal for | Breadth of retention across the base | Financial impact of retention on recurring revenue |
| Example divergence | 5 of 100 SMB customers churn = 5% logo churn | If those 5 were the smallest accounts, revenue churn may be only 2% |
This example assumes a product with mixed plan sizes. If larger accounts churn disproportionately, revenue churn will exceed logo churn. If smaller accounts churn disproportionately, logo churn will exceed revenue churn. Reviewing both together provides a more complete view than either metric alone.
5. Worked Example: Hypothetical SaaS Company (900 Customers)
This example assumes a hypothetical SaaS company to illustrate the arithmetic. The scenario is not based on a specific real business, and actual results will vary with pricing, customer mix, and retention patterns. This calculator estimates churn using the same arithmetic applied to the values entered.
- Starting base: This example assumes 900 active customers at the start of the month, each on a $100/mo plan, for $90,000 starting MRR.
- Customers lost: 45 customers cancel during the month and do not renew.
- Customer churn rate: 45 ÷ 900 × 100 = 5.0% monthly customer churn. This example assumes no intra-period averaging; using an averaged denominator would produce a slightly different estimate.
- MRR churned: 45 × $100 = $4,500 in recurring revenue lost to cancellation. Gross revenue churn is therefore $4,500 ÷ $90,000 × 100 = 5.0% as well in this uniform-pricing scenario.
- Implied retention and lifetime: A 5% monthly churn implies approximately 95% monthly retention. A simplified average customer lifetime can be estimated as 1 ÷ churn rate, so 1 ÷ 0.05 = 20 months on average. This is a statistical estimate, not a prediction for any individual customer.
If pricing were not uniform, the two rates would diverge. For instance, this example assumes the 45 lost customers instead included 10 enterprise accounts at $1,000/mo and 35 small accounts at $100/mo. MRR lost would then be (10 × $1,000) + (35 × $100) = $13,500, and gross revenue churn would be $13,500 ÷ $90,000 × 100 = 15.0%, even though logo churn remains 45 ÷ 900 = 5.0%. This illustrates why both views are tracked separately.
6. Monthly vs Annual Churn: How to Convert
Monthly and annual churn are not related by simple multiplication, because retention compounds. Retaining 95% of customers each month for 12 months results in lower cumulative retention than 12 × 5% would suggest. The standard conversion uses compounding, assuming a constant monthly rate throughout the year.
Annual Churn = 1 − (1 − Monthly Churn) ^ 12
Monthly Churn = 1 − (1 − Annual Churn) ^ (1 ÷ 12)
Where rates are expressed as decimals (e.g., 5% = 0.05)| Monthly Churn | Annualized Churn (compounded) | Simple ×12 (incorrect) |
|---|---|---|
| 2.0% | 21.5% | 24.0% |
| 5.0% | 46.0% | 60.0% |
| 7.5% | 61.0% | 90.0% |
| 10.0% | 71.8% | 120.0% |
This example assumes a constant 5% monthly churn. Annual churn is then estimated as 1 − (1 − 0.05)^12 = 1 − 0.95^12 ≈ 1 − 0.540 = 0.460, or about 46% annualized. This calculator estimates annualized churn using the same compounding method. Conversely, a stated 46% annual churn implies a monthly rate of 1 − (1 − 0.46)^(1/12) ≈ 5.0%.
7. What Churn Rate Benchmarks Exist
There is no single churn rate that is universally good or bad. Hypothetical ranges sometimes cited for illustration vary widely by market, contract length, average contract value, and customer segment, and they do not constitute targets or advice.
| Segment (illustrative) | Hypothetical Monthly Churn Range | Context |
|---|---|---|
| SMB self-serve SaaS | 3% – 7% monthly | Higher logo churn common with low ACV and monthly billing |
| Mid-market SaaS | 1.5% – 4% monthly | Contract terms and onboarding support often lower monthly loss |
| Enterprise SaaS | 0.5% – 2% monthly | Annual contracts and high switching costs typically reduce logo churn |
| Consumer subscription | 4% – 10% monthly | Discretionary spend and low commitment increase variability |
These ranges are hypothetical examples for educational context only. Actual churn depends on product-market fit, pricing, competition, and cohort composition. A rate that is typical in one segment may indicate retention or attrition dynamics that warrant investigation in another. This article does not set benchmarks or recommend a target rate.
8. Common Churn Calculation Mistakes
Errors in churn calculation often stem from mixing the wrong denominator, period, or revenue definition into the formula. The table below summarizes frequent mistakes and the corresponding correct approach. Each correction reflects a general estimation practice; actual treatment may vary by business model.
| Mistake | Why It Is Wrong | Correct Approach |
|---|---|---|
| Including new customers in the denominator | New logos were not at risk at period start and dilute the rate | Divide only by customers or MRR at the start of the period |
| Mixing gross and net revenue churn | Net churn offsets losses with expansion and masks gross attrition | Report gross and net separately; use gross for pure loss, net for cohort growth |
| Multiplying monthly churn by 12 | Ignores compounding and overstates or understates annualized churn | Use 1 − (1 − monthly)^12 for annualization |
| Counting trials or free users as churn | Trials that never converted were never active subscribers | Include only active paying subscriptions at period start |
| Using inconsistent periods | Comparing a 30-day month to a 31-day month without normalization distorts trends | Fix period length or normalize to a consistent window and apply it consistently |
| Including one-time fees in MRR churn | One-time charges do not recur and inflate revenue base | Include only automatically recurring revenue in MRR inputs |
Applying these corrections consistently across periods improves comparability. This calculator estimates churn based on the recurring base entered and does not constitute business advice about retention strategy.
Frequently Asked Questions
- How do you calculate churn rate?
- This example calculates customer churn rate as (Customers Lost in Period ÷ Customers at Start of Period) × 100. For instance, this example assumes 45 customers lost out of 900 at the start, so 45 ÷ 900 × 100 = 5.0% for the period. New customers added mid-period are excluded from the denominator because they were not at risk at the start. This calculator estimates churn using the same formula applied to the values entered.
- What is the difference between customer churn and revenue churn?
- Customer (logo) churn counts the number of customers lost divided by starting customers, so every logo counts equally. Revenue churn divides recurring revenue lost (MRR churned plus contraction) by starting MRR, so larger accounts weigh more. This example assumes uniform pricing where 45 of 900 customers churn, producing 5.0% on both measures; with mixed account sizes the two rates diverge and are tracked separately.
- What is gross vs net revenue churn?
- Gross revenue churn measures only losses — MRR churned plus contraction divided by starting MRR — and cannot be negative. Net revenue churn subtracts expansion in the retained cohort from those losses, so it can be negative when expansion exceeds losses. This example assumes $4,500 lost on $90,000 starting MRR for 5.0% gross churn; if $6,000 in expansion occurred in the same cohort, net revenue churn would be ($4,500 − $6,000) ÷ $90,000 = −1.7%.
- How do you convert monthly churn to annual churn?
- Annual churn is not monthly churn × 12 because retention compounds. This example estimates annual churn as 1 − (1 − Monthly Churn)^12 with rates as decimals. For instance, this example assumes 5% monthly churn, so annual churn is 1 − 0.95^12 ≈ 46%. The reverse conversion is Monthly Churn = 1 − (1 − Annual Churn)^(1/12). This calculator estimates annualized churn using the same compounding method.
- What is a good churn rate for SaaS?
- There is no universally good churn rate; what is typical varies by target market, contract length, average contract value, and customer segment. The hypothetical ranges in this article (e.g., 3%–7% monthly for SMB self-serve versus lower ranges for enterprise) are illustrative examples only and not targets. Churn is most informative when evaluated alongside acquisition, expansion, and net retention rather than against a single benchmark.
- Can churn rate be negative?
- Customer (logo) churn cannot be negative because it only counts customers lost. Gross revenue churn also cannot be negative for the same reason. Net revenue churn can be negative when expansion revenue in the retained cohort exceeds the revenue lost to churn and contraction in the same period — a condition sometimes called net negative churn. This indicates cohort growth despite losses, not negative customer loss.