Churn Rate Calculator

Time Period

Input Method

Customers at Start of Period

Customers Lost During Period

Avg. Monthly Revenue per Customer (ARPU)

Optional — enables revenue impact calculation

Enter Your Customer Data

Fill in your customer counts (or MRR for net revenue mode) to calculate churn rate, retention, lifetime value, and revenue impact.

Last updated October 20, 2018

Calculate churn, retention, revenue impact, and multi-year projections

Customer churn — the rate at which subscribers or paying customers stop doing business with you — is one of the most critical metrics for any subscription-based or recurring-revenue business. Whether you run a SaaS platform, a membership site, a mobile app, or an e-commerce subscription box, understanding your churn rate is essential for forecasting revenue, evaluating product-market fit, and identifying retention problems before they escalate into existential threats. This free churn rate calculator goes far beyond simple percentage math. It offers four calculation modes to cover every common use case: Customer Churn (the core metric), Revenue Churn (translating customer loss into dollar impact), Net Revenue Churn (accounting for expansion MRR from upsells and upgrades), and Multi-Year Projection (forecasting subscriber count and revenue over a 1–10 year horizon with both growth and churn factored in). All modes auto-calculate as you type, so you get instant feedback without pressing any buttons. For the Customer Churn mode, you can enter data two ways: Method A requires only starting customer count and customers lost — the quickest calculation. Method B is used when you know period start and end counts plus new acquisitions, and automatically derives the number churned. Both methods produce the same key outputs: churn rate (%), retention rate (%), customer lifetime in months and years, and precise monthly-to-annual or annual-to-monthly churn rate conversions using the mathematically correct compounding formula (Annual = 1 − (1 − monthly)^12) rather than the common but inaccurate simple multiplication. When you enter an Average Revenue Per User (ARPU), the calculator instantly shows you the monthly and annual revenue at risk from your current churn, and optionally models a target churn rate scenario — how much additional revenue would be retained if you achieved that lower churn rate. This "improvement scenario" is powerful for business cases: quantify exactly what a retention initiative is worth in dollar terms before investing in it. The Revenue Churn mode takes a revenue-first perspective: enter the same inputs with ARPU required, and the results emphasize dollar losses over customer count percentages. This framing is often more compelling for executive or investor presentations. Net Revenue Churn is a more sophisticated metric used primarily by SaaS companies. It combines lost MRR from churned accounts with expansion MRR from upgrades and upsells by existing customers. When expansion exceeds churn, you achieve "negative churn" — a highly desirable state where your existing customer base grows revenue organically even without acquiring new customers. The WaterfallChart visualization makes this decomposition immediately intuitive. The Multi-Year Projection mode builds a year-by-year forecast table showing beginning customers, new additions, churned customers, and ending customers for each year, plus annual revenue if ARPU is provided. A LineGraph compares two scenarios: the current trajectory with churn and growth applied versus a hypothetical no-churn baseline, visually illustrating the compounding cost of churn over time. All results include an industry benchmark reference table spanning B2B Enterprise, B2B SMB, B2C SaaS, and eCommerce segments, plus a color-coded status badge (Excellent / Good / Average / High / Critical) so you can immediately see how your churn compares to industry norms. A monthly-to-annual conversion reference table is also included for the eight most common monthly churn rates.

Understanding Churn Rate

What Is Churn Rate?

Churn rate (also called attrition rate or customer turnover rate) is the percentage of customers or subscribers who cancel or don't renew their relationship with a business during a specific period. It is the opposite of retention rate: if your monthly churn rate is 3%, your monthly retention rate is 97%. Churn can be measured at the customer level (how many accounts were lost) or at the revenue level (how much MRR was lost). Customer churn and revenue churn can differ significantly when customers of different sizes churn at different rates — losing one enterprise account that pays $50,000/month has a much larger revenue impact than losing fifty small accounts at $100/month each.

How Is Churn Rate Calculated?

The core formula is straightforward: Churn Rate = (Customers Lost ÷ Customers at Start of Period) × 100. When you know only start and end counts (and new acquisitions), lost customers = Start + New Acquired − End. Revenue churn adds an ARPU dimension: Monthly Revenue Lost = Customers Lost × ARPU. For period conversions, the mathematically precise formula is used: Annual Churn = 1 − (1 − Monthly Rate)^12. The simple approximation (Annual ≈ Monthly × 12) significantly overstates annual churn at higher monthly rates; for example, a 5% monthly churn equals approximately 46% annually — not 60% as the naive multiplication would suggest. Net Revenue Churn = (Lost MRR − Expansion MRR) ÷ Starting MRR × 100, and can be negative when expansion exceeds churn losses.

Why Does Churn Rate Matter?

Churn directly determines the financial sustainability of a recurring-revenue business. High churn forces companies into a "leaky bucket" mode — spending heavily on acquisition just to replace lost customers, with little net growth. The compounding effect is severe: at a 5% monthly churn rate, a business loses approximately 46% of its customer base every year, meaning nearly half its revenue must be rebuilt annually through new sales. Customer Lifetime Value (CLV) is the inverse of churn: lower churn means higher lifetime value, which justifies higher customer acquisition cost (CAC), enabling you to outspend competitors on marketing and win market share. Even small improvements in churn have massive revenue impact — reducing monthly churn from 3% to 2% can increase CLV by 33%.

Limitations and Caveats

Churn rate is a lagging indicator — it tells you what has already happened, not why. A single aggregate churn number can mask important cohort differences: newly acquired customers often churn at higher rates than tenured ones, and different product tiers or customer segments may have very different retention profiles. The "improvement scenario" in this calculator assumes the rate reduction is immediately applicable to the existing customer base, which is optimistic — churn reduction programs typically take months to show results. Industry benchmark ranges are approximate and vary by company stage, pricing model, market segment, and economic conditions. Use benchmarks as directional guides rather than precise targets.

Churn Rate Formulas

Customer Churn Rate

Churn Rate = (Customers Lost ÷ Customers at Start) × 100

The core churn formula — the percentage of customers who cancelled or did not renew during a given period.

Revenue Churn (Gross MRR Churn)

Revenue Churn Rate = (Lost MRR ÷ Starting MRR) × 100

Measures churn in dollar terms rather than customer count. More meaningful when customers vary significantly in size.

Net Revenue Retention (NRR)

NRR = ((Starting MRR − Lost MRR + Expansion MRR) ÷ Starting MRR) × 100

Accounts for expansion revenue from upsells. NRR above 100% means existing customers grow revenue even without new acquisition — the gold standard for SaaS.

Monthly to Annual Churn Conversion

Annual Churn = 1 − (1 − Monthly Churn)^12

The mathematically precise compounding formula. The naive approximation (monthly × 12) significantly overstates annual churn at higher rates.

Churn Rate Reference Tables

Healthy Churn Rate Benchmarks by Industry

Typical monthly and annual churn rate ranges by business segment. Lower churn is always better — even small improvements compound significantly.

Industry Segment	Monthly Churn	Annual Churn	Rating
B2B Enterprise SaaS	< 0.5%	< 5%	Excellent
B2B SMB SaaS	0.5–1.5%	6–17%	Good to Average
B2C SaaS / Consumer Subscription	1–3%	12–30%	Average
eCommerce Subscription Boxes	3–7%	30–58%	Average to High
Mobile Apps (Freemium)	5–10%	46–72%	High (expected)
Streaming / Media	2–5%	22–46%	Average to High
Telecom / ISP	1–2%	12–22%	Average

Churn Impact on Customer Base Over Time

How different monthly churn rates compound to erode your customer base over 1, 2, and 5 years (assuming no new customer acquisition).

Monthly Churn	Annual Churn	Customers Remaining After 1 Year	After 2 Years	After 5 Years
1%	11.4%	88.6%	78.5%	54.6%
2%	21.5%	78.5%	61.6%	29.4%
3%	30.6%	69.4%	48.1%	16.3%
5%	46.0%	54.0%	29.2%	4.6%
7%	58.3%	41.7%	17.4%	1.2%
10%	71.8%	28.2%	7.9%	0.1%

Worked Examples

Monthly Churn from 1,000 Customers Losing 30

A SaaS company starts the month with 1,000 active customers. During the month, 30 customers cancel their subscriptions. ARPU is $49/month.

Churn Rate = (30 ÷ 1,000) × 100 = 3.0%

Retention Rate = 100% − 3.0% = 97.0%

Customer Lifetime = 1 ÷ 0.03 = 33.3 months (2.8 years)

Monthly Revenue Lost = 30 × $49 = $1,470

Annual Revenue Lost = $1,470 × 12 = $17,640

Equivalent Annual Churn = 1 − (1 − 0.03)^12 = 30.6%

A 3% monthly churn rate compounds to 30.6% annually. The company loses $17,640 per year from each month's churned cohort, and the average customer stays only 2.8 years.

Annual Impact of 5% Monthly Churn

A subscription business has 2,000 customers at $99/month with 5% monthly churn. They want to understand the annual impact and model reducing churn to 3%.

Annual Churn = 1 − (1 − 0.05)^12 = 46.0%

Customers lost in first year = 2,000 × 46.0% = 920 customers

Annual Revenue Lost = 920 × $99 × 12 = $1,092,960

At 3% monthly: Annual Churn = 30.6%, losing 612 customers

Revenue saved by reducing to 3% = (920 − 612) × $99 × 12 = $365,904

At 5% monthly churn, the company loses 920 customers and over $1M annually. Reducing to 3% monthly would save 308 customers and $365,904 per year — a clear ROI target for retention initiatives.

Net Revenue Churn with Expansion MRR

Starting MRR is $100,000. During the month, $4,500 in MRR is lost to cancellations, but $2,000 is gained from existing customer upgrades and expansions.

Gross Revenue Churn = ($4,500 ÷ $100,000) × 100 = 4.5%

Net MRR Change = −$4,500 + $2,000 = −$2,500

Net Revenue Churn = ($2,500 ÷ $100,000) × 100 = 2.5%

NRR = (($100,000 − $4,500 + $2,000) ÷ $100,000) × 100 = 97.5%

While gross churn is 4.5%, expansion MRR reduces the net impact to 2.5%. NRR of 97.5% is below the 100% target — the company needs more expansion revenue or less churn to achieve negative net churn.

How to Use the Churn Rate Calculator

Choose Your Calculation Mode

Select from four modes at the top: Customer Churn (track account attrition), Revenue Churn (measure dollar impact), Net Revenue Churn (factor in expansion MRR from upsells), or Multi-Year Projection (forecast customer count and revenue over 1–10 years). For most use cases, start with Customer Churn mode.

Enter Your Customer Counts

In Customer Churn mode, enter the number of customers at the start of your period and the number who cancelled. Alternatively, switch to the 'Start + End + New' method if you know your beginning and ending counts plus new acquisitions — the calculator derives the churned count automatically.

Add ARPU for Revenue Impact

Enter your Average Monthly Revenue per Customer (ARPU) to unlock the revenue impact section, which shows monthly and annual revenue lost to churn. You can also enter a target churn rate to see how much additional revenue would be retained if you achieved that lower rate — quantifying the ROI of retention initiatives.

Review Benchmarks and Export

Check your churn rate against the industry benchmark table to see whether you fall in the Excellent, Good, Average, High, or Critical band. Use the Export CSV button to download your results for reports or spreadsheets, or Print Results for a clean printable summary.

Frequently Asked Questions

What is a good monthly churn rate for a SaaS business?

For B2B SaaS companies targeting enterprise customers, a monthly churn rate below 0.5% (roughly 6% annually) is considered excellent. For SMB-focused SaaS, 0.5–1% monthly (6–12% annually) is generally acceptable. Consumer-facing SaaS products tolerate higher churn — 1–3% monthly is common and considered average. If your monthly churn exceeds 5%, it typically indicates a serious product-market fit or onboarding problem that requires urgent attention. Keep in mind that early-stage companies often have higher churn than mature ones as they refine their ideal customer profile and improve their product.

What is the difference between customer churn and revenue churn?

Customer churn measures the percentage of accounts lost, while revenue churn (also called MRR churn or gross revenue churn) measures the percentage of monthly recurring revenue lost from those churned accounts. These can differ substantially when customers of different sizes churn at different rates. For example, if you lose 10 small customers ($100/month each) but retain all enterprise customers ($10,000/month each), your customer churn rate might be 5% but your revenue churn rate is much lower. Net revenue churn goes further by subtracting expansion MRR (revenue from upsells/upgrades) from gross revenue churn, which can result in negative net revenue churn when expansion outpaces losses.

How do I convert monthly churn rate to annual churn rate?

The precise formula is: Annual Churn Rate = 1 − (1 − Monthly Churn Rate)^12. For example, a 3% monthly churn rate converts to Annual = 1 − (0.97)^12 = 1 − 0.6938 = 30.6% — not 36% as the simple multiplication (3% × 12) would suggest. The simple approximation increasingly overstates annual churn as the monthly rate rises. At low rates (under 1% monthly), the approximation is reasonably accurate, but at 5% monthly the error becomes significant: precise annual churn is approximately 46%, not 60%. This calculator always uses the precise compounding formula.

What is negative churn and how is it achieved?

Negative churn occurs when expansion MRR from upsells, cross-sells, and plan upgrades by existing customers exceeds the MRR lost from churned accounts — meaning net revenue from the existing customer base grows even after accounting for all cancellations. Achieving negative churn is considered the gold standard for SaaS businesses because it creates a self-reinforcing growth engine: even if you stopped acquiring new customers entirely, your revenue would continue growing. Negative churn is most common in product-led growth companies with usage-based pricing, or in businesses with strong land-and-expand motions where customers naturally grow their usage over time.

Why does the Multi-Year Projection mode show two lines in the chart?

The projection chart displays two scenarios side by side: the blue line shows what customer count would look like if only your growth rate applied with zero churn (the theoretical maximum), while the primary-color line shows the realistic trajectory with both your growth rate and churn rate applied. The gap between the two lines represents the cumulative cost of churn over time — a powerful visual that demonstrates how even modest churn rates compound into significant customer base erosion over multiple years. This comparison is especially useful for board presentations and investor pitches to justify investment in retention programs.

How should I use the target churn rate scenario?

The target churn rate field lets you model the financial benefit of reducing churn to a specific goal. Enter your current churn data and ARPU, then set a target rate below your current rate — for example, if you're at 4% monthly and want to model a target of 2%. The calculator shows how many additional customers would be retained and the resulting monthly and annual revenue gains. This is a valuable tool for building internal business cases for retention investments: if reducing churn from 4% to 2% generates an additional $50,000 per month, that quantifies what you should be willing to spend on retention technology, customer success headcount, or product improvements.

Churn Rate Calculator