Maxi Calculator

Churn Rate Calculator

Calculate beginning-cohort churn, retention and net customer change for one period, with optional revenue estimates and explicit constant-rate assumptions.

Churn Rate Calculator

Enter the number of customers at the start of the period

Starting customers still active at the end, plus new customers active at the end

Starting customers no longer active at the end of this period

New customers acquired during this period and still active at the end

Choose the time period for the churn calculation

Optional: Enter the average monthly revenue per customer

Table of Contents

Understanding Customer Churn

Customer churn, also known as customer attrition, is the rate at which customers stop doing business with a company over a given period. Understanding churn is crucial because:

  • It directly impacts revenue and growth potential
  • It shows how many starting customers leave during the period
  • Trends can prompt investigation of product or service changes
  • It affects customer lifetime value and business sustainability

Calculating Churn Rate

Basic Churn Rate Formula

Churn Rate = (Lost Customers / Starting Customers) × 100

Net Customer Change Formula

Net Customer Change Rate = ((Lost Customers - New Customers) / Starting Customers) × 100

Count unique customers over one selected period. Here, lost means customers from the starting cohort who are not active at period end; new means customers acquired during the period who remain active at period end. Ending customers must equal starting minus lost plus new. For example, 100 starting, 20 lost, and 10 new customers gives 90 ending customers, 20% churn, 80% retention, and 10% net customer decline.

Time Periods

Monthly, quarterly, and annual rates describe different periods. The equivalent monthly and annual figures assume the measured churn rate repeats at a constant rate across periods:

  • Monthly: One month of observed customers
  • Quarterly: Three months of observed customers
  • Annually: Twelve months of observed customers

Types of Churn Metrics

Customer Churn

Measures the percentage of customers who stop using your product or service.

Revenue Churn

Calculates the loss of recurring revenue from churned customers. This can differ from customer churn if customers spend different amounts.

Net Customer Change

Subtracts new customers from lost customers, then divides by the starting customer count. It is a customer count measure, not net revenue churn.

Retention Rate

The opposite of churn rate, showing the percentage of customers who continue using your product or service.

Strategies to Reduce Churn

  • Improve Customer Onboarding: Ensure customers understand and get value from your product quickly
  • Regular Communication: Keep customers engaged and informed about new features and benefits
  • Proactive Support: Address issues before they lead to customer dissatisfaction
  • Gather Feedback: Regularly collect and act on customer feedback
  • Identify At-Risk Customers: Use analytics to spot warning signs of potential churn
  • Add Value: Continuously improve your product and demonstrate its value to customers

Frequently Asked Questions

What is a good churn rate?

A useful comparison uses the same customer definition, period, market, and business model. This calculator does not grade churn against an industry threshold.

How does churn affect customer lifetime value (CLV)?

The calculator shows a simple lifetime revenue estimate: entered monthly revenue per customer divided by the equivalent monthly churn fraction. It assumes that churn and monthly revenue stay constant. It excludes costs, margin, discounting, and customer differences. At zero observed churn this estimate is undefined.

Should I focus on reducing churn or acquiring new customers?

Compare the expected costs and returns of each using your own customer data. Customer churn alone cannot determine which investment has the better return.

How often should I measure churn?

Choose a period suited to your customer purchase or billing cycle. Compare like periods over time. Converted monthly and annual rates are model estimates, not separately observed results.

Definition and source

The count formulas use one customer definition and one observation period. Beginning-cohort losses exclude customers acquired during the period who also leave; new customers in the reconciliation are those still present at the end. These are customer counts, not revenue retention or evidence of profitability.

Formula reference; checked: Stripe — Retention rate vs. churn rate. 2026-09-30.