What’s the correct denominator for logo (customer) churn — starting customers or ending customers?

Use starting customers for the selected period. Logo churn is meant to measure how much of your beginning customer base you lost, not how many you ended with.

Should I include new customers gained during the period when calculating customer churn?

For true logo churn, don’t include new customers—new logos are a separate growth motion. Only include new customers if you’re intentionally trying to normalize churn against a changing customer base, and then keep that method consistent over time.

How do I compare monthly churn to quarterly or annual churn without misleading myself?

Convert using compounding, not simple division. If your churn is measured over N months, monthly-equivalent churn is: Monthly-equivalent churn (from churn over an N-month period): Monthly churn = 1 − (1 − Period churn)^(1/N) _(read as: “one minus (one minus period churn) to the power of one over N”)_ Annual churn (from monthly churn): Annual churn = 1 − (1 − Monthly churn)^12

When is logo churn the wrong metric, and I should use Net MRR Churn / NRR instead?

Use Net MRR Churn (or NRR) when expansions, downgrades, and account size differences matter—logo churn can look “fine” while revenue retention is slipping (or vice versa).

Customer Churn Rate Calculator (Logo / Account Churn)

Customer Churn Rate Calculator (Logo / Account churn)

Logo (customer count) churn — not revenue/MRR churn. Calculate customer churn rate for a period with a clean, minimal input set, plus scenarios and short “What It Means?” explanations.

Inputs

Period

Use customer counts for a single month. Churn is computed for the selected period; classification uses the monthly-equivalent churn rate.

Starting customers

Customers lost (churned)

Include new customers (optional)

New customers (optional)

Results

Customer churn rate %
Monthly‑equivalent churn (for classification) %
Customer retention rate %
Customers retained
Ending customers (computed)

What is Customer Churn Rate (Logo / Account churn)?

Customer churn rate (logo churn) is the percentage of starting customer accounts that cancel or fail to renew during a defined period (month/quarter/year), ignoring how much they paid.

It matters because logo losses shrink the renewable revenue base, reduce LTV, raise required new bookings just to “stand still,” and weaken unit economics and value creation (ARR/MRR durability, Rule of 40, and capital efficiency).

Formula

Example

Starting customers (beginning of month): 1,000

Customers lost (churned) during month: 30

Customers retained: 970

How to Use the Customer Churn Rate Calculator (Logo / Account churn)

Pick the period, enter your starting customer count and customers lost, and the calculator will instantly show churn %, retention %, and the number of customers retained.

Choose the reporting period
- Select Monthly, Quarterly, or Annually based on how you track churn internally.
Enter Starting customers
- Type the number of active paying customers you had at the start of the selected period.
Enter Customers lost (churned)
- Add the number of customers who canceled or became inactive during that same period.
(Optional) Include new customers + scenarios
- - Turn on Include new customers only if you want your churn view adjusted for customers added during the period.
- Use Scenarios to test “what if churn was lower/higher” without changing your base inputs.
Read the results and take action
- - Review Customer churn rate, Customer retention rate, and Customers retained.
- Use What it means? as a quick diagnostic, then Share / Embed to save or send the result (charts are optional).

Frequently Asked Questions

Use starting customers for the selected period. Logo churn is meant to measure how much of your beginning customer base you lost, not how many you ended with.
For true logo churn, don’t include new customers—new logos are a separate growth motion. Only include new customers if you’re intentionally trying to normalize churn against a changing customer base, and then keep that method consistent over time.
Convert using compounding, not simple division. If your churn is measured over N months, monthly-equivalent churn is:
- - Monthly-equivalent churn (from churn over an N-month period):
Monthly churn = 1 − (1 − Period churn)^(1/N)
_(read as: “one minus (one minus period churn) to the power of one over N”)_
- - Annual churn (from monthly churn):
Annual churn = 1 − (1 − Monthly churn)^12
Use Net MRR Churn (or NRR) when expansions, downgrades, and account size differences matter—logo churn can look “fine” while revenue retention is slipping (or vice versa).

Methodology & Sources

Bibliography

Manas Punhani; Will Bressman; G. J. King; A. J. Wasserstein (2021). On the Nature of Customer Attrition and Revenue Analysis — Yale School of Management (Yale Case) https://som.yale.edu/sites/default/files/2025-04/On%20the%20Nature%20of%20Customer%20Attrition%20and%20Revenue%20Analysis.pdf
Accessed 2025-12-16
Peter S. Fader; Bruce G. S. Hardie (2007). How to Project Customer Retention — Journal of Interactive Marketing (Wiley Periodicals, Inc.) https://faculty.wharton.upenn.edu/wp-content/uploads/2012/04/Fader_hardie_jim_07.pdf
Accessed 2025-12-16
Stripe (2024). Retention rate vs. churn rate: What businesses need to know — Stripe (Guides / Billing) https://stripe.com/resources/more/retention-rate-vs-churn-rate-what-businesses-need-to-know
Accessed 2025-12-16

Customer Churn Rate Calculator (Logo / Account churn)

Inputs

Results

What It Means?

What is Customer Churn Rate (Logo / Account churn)?

Formula

Example

How to Use the Customer Churn Rate Calculator (Logo / Account churn)

Choose the reporting period

Enter Starting customers

Enter Customers lost (churned)

(Optional) Include new customers + scenarios

Read the results and take action

Frequently Asked Questions

Methodology & Sources

Bibliography

Other Calculators in SaaS Metrics

Customer Lifespan (Average Customer Lifespan) Calculator

Net Revenue Retention (NRR) Calculator

Gross Revenue Retention Calculator