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Churn Rate Calculator

Calculate customer churn rate, revenue (MRR) churn, or annualized churn rate from a monthly rate. Instant results with formula breakdown — built for SaaS and subscription businesses.

Author: Naeem Ullah
•Last Updated: July 7, 2026•
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Active Calculation FormulaChurn Rate = (Customers Lost ÷ Customers at Start) × 100

Adjust Variables

customers
customersLostChurn
Min: 0 customersMax: 10k
customers
customersAtStartChurn
Min: 0 customersMax: 10k
Use Real Campaign Presets
Real-Time Results
Customer Churn Rate0%
Customers Retained0
Retention Rate0%
All calculations are compiled with double-precision floating math directly in this browser frame. Perfect precision guaranteed.

Interactive Step-by-Step Calculation Proofs

View how variables resolve algebraically down to peer-reviewed standard outputs.

Dynamic E-E-A-T Metric Valuation

Churn rate measures the percentage of customers (or revenue) a business loses over a given period, and it's one of the most closely watched metrics in subscription and SaaS businesses, where retaining existing customers is often cheaper than acquiring new ones. Customer churn rate is calculated as (Customers Lost ÷ Customers at Start of Period) × 100. But customer count alone can be misleading — losing ten small accounts is very different from losing your single largest customer — which is why SaaS businesses also track revenue churn (MRR churn): the percentage of recurring revenue lost, calculated the same way but using dollars instead of customer counts. Because churn is normally measured monthly but often needs to be communicated as an annual figure, this calculator also converts a monthly rate to an annualized churn rate using compounding (not simple multiplication by 12, which understates the true annual impact). This calculator's 'customer churn' mode uses the same core formula as the attrition rate calculator's customer mode — 'churn rate' and 'customer attrition rate' are the same metric under different names, with 'churn' being the more common term in SaaS and subscription businesses specifically.

Mathematical Formula Explanation

Calculated standard benchmarks are based on direct functional dependencies. The primary calculation logic follows this formula:

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

When using our reverse-solving system, the unknown parameter is algebraically isolated. For instance, solving for total impressions required derived from an active budget uses the inverted ratio, safeguarding metrics calculations against arbitrary platform fees or roundoffs.

Standard Campaign Scenarios (Step-by-Step)

Review these typical campaign outlines to verify how calculation steps behave under realistic media buying conditions:

Case Scenario 1

Example 1: Monthly Customer Churn

“A subscription business starts the month with 1,000 active customers and loses 50 to cancellations. What is the customer churn rate?”

Given Inputs
  • CUSTOMERSLOSTCHURN: 50
  • CUSTOMERSATSTARTCHURN: 1,000
Computed Outputs
  • CHURNRATECUSTOMER: 5
  • CUSTOMERSRETAINEDCHURN: 950
  • RETENTIONRATECHURN: 95
Case Scenario 2

Example 2: Revenue (MRR) Churn

“A SaaS company starts the month with $100,000 in MRR and loses $5,000 in MRR to cancellations and downgrades. What is the revenue churn rate?”

Given Inputs
  • MRRLOST: 5,000
  • MRRATSTART: 100,000
Computed Outputs
  • REVENUECHURNRATE: 5
  • MRRRETAINED: 95,000
Case Scenario 3

Example 3: Annualizing a Monthly Churn Rate

“A business has a steady 5% monthly churn rate. What does that work out to as an annual churn rate?”

Given Inputs
  • MONTHLYCHURNPCT: 5
Computed Outputs
  • ANNUALIZEDCHURNRATE: 45.96
  • ANNUALRETENTIONRATE: 54.04

Frequently Asked Questions (FAQ)

Churn rate is the percentage of customers (or revenue) a business loses over a given period, typically a month. It's the inverse of retention rate and is one of the most important health metrics for subscription and SaaS businesses, since it directly measures how well a company keeps the customers it already has.
The formula is: Churn Rate = (Customers Lost ÷ Customers at Start of Period) × 100. For revenue churn, substitute dollar amounts: Revenue Churn Rate = (MRR Lost ÷ MRR at Start of Period) × 100.
Divide the number of customers lost during the period by the number of customers you had at the start of the period, then multiply by 100. For example, losing 50 of 1,000 starting customers gives a churn rate of (50 ÷ 1,000) × 100 = 5%.
SaaS businesses typically track both customer churn (percentage of accounts lost) and revenue churn (percentage of MRR lost), since the two can diverge significantly — losing many small free-tier-adjacent accounts affects customer churn much more than revenue churn, while losing one large enterprise account can spike revenue churn without moving customer churn much. Most SaaS reporting tracks both side by side.
Revenue churn (MRR churn) measures the percentage of monthly recurring revenue lost to cancellations and downgrades, rather than the percentage of customer accounts lost. A business can have low customer churn but high revenue churn if it's losing a small number of high-value accounts, or the reverse if it's losing many low-value accounts while retaining its biggest customers. Tracking both gives a fuller picture than either alone.
Don't simply multiply the monthly rate by 12 — that overstates the true annual churn because it doesn't account for the shrinking customer base each month. Instead use: Annualized Churn = [1 − (1 − Monthly Churn)¹²] × 100. A steady 5% monthly churn rate compounds to roughly 46% annualized churn, not 60% (5% × 12).
For B2B SaaS, monthly customer churn under 1–2% (roughly 10–15% annualized) is often considered good, though targets vary by customer segment — enterprise customers typically churn much less than small-business or consumer customers. Revenue churn below customer churn (meaning the business retains or grows revenue from surviving accounts, sometimes called 'net negative churn') is considered especially healthy.
Churn rate and retention rate are complementary and always sum to 100%: Retention Rate = 100% − Churn Rate. A 5% churn rate means a 95% retention rate — the same underlying data viewed from opposite directions. Churn rate emphasizes what was lost; retention rate emphasizes what was kept.
Yes, when referring to customers — 'churn rate' and 'customer attrition rate' describe the identical calculation. 'Churn' is the term most commonly used in SaaS, subscription, and telecom businesses, while 'attrition' is more commonly used in HR (employee attrition) and some broader business contexts. See the attrition rate calculator if you're specifically working with employee data.

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