What is Customer Retention Rate?
Customer retention rate measures the percentage of customers who continue doing business with you over a given period. It's the inverse of churn rate and one of the most important metrics for sustainable growth.
Retention is often more valuable than acquisition. Acquiring a new customer costs 5-25x more than retaining an existing one. Retained customers also tend to spend more and refer others.
Why Retention Rate Matters
A 5% improvement in retention can increase profits by 25-95%, according to research by Bain. Retained customers have lower CAC (they're already acquired), higher lifetime value, and generate referrals.
Retention rate also indicates product-market fit and customer satisfaction. If customers keep coming back, you're delivering value.
Retention Rate Benchmarks
Varies dramatically by business model. Subscription SaaS: 90-95% annually is strong. Ecommerce: 20-40% first-year repurchase is typical. Mobile apps: 25-40% Day 30 retention is good.
How to Calculate Customer Retention Rate Step by Step
Step 1: Pick your time period. Monthly for SaaS, quarterly or annually for ecommerce.
Step 2: Count customers at the start, end, and new customers acquired.
- Customers at start of quarter: 500
- Customers at end of quarter: 520
- New customers acquired during quarter: 65
Step 3: Apply the formula. Retention Rate = (End Customers - New Customers) ÷ Start Customers × 100
- Retained customers = 520 - 65 = 455
- Retention Rate = 455 ÷ 500 = 91%
You retained 91% of your starting customers. 45 customers (9%) churned. For SaaS, this is slightly below the 95% target.
Step 4: Calculate the inverse (churn rate). Churn = 1 - Retention = 9% quarterly. See churn rate for the detailed breakdown.
Step 5: Segment retention by cohort, plan, and source. Enterprise customers might retain at 98% while SMB retains at 82%. This segmentation drives strategy. Do you invest in SMB retention or focus on acquiring more enterprise?
Common mistakes founders make:
- Including new customers in the count (inflates retention)
- Not specifying the time period (monthly vs annual retention are very different numbers)
- Comparing retention across different business models (SaaS vs ecommerce norms differ)
- Tracking only logo retention without pairing with revenue retention
Formula
Retention Rate = ((Ending Customers - New Customers) ÷ Starting Customers) × 100
Or: (Customers Retained ÷ Starting Customers) × 100
Churn Rate = 100% - Retention Rate
Example
Quarterly retention:
- Customers at start: 1,000
- New customers acquired: 300
- Customers at end: 1,100
- Churned customers: 1,000 + 300 - 1,100 = 200
Retention Rate = (1,100 - 300) ÷ 1,000 = 80%
You retained 800 of your original 1,000 customers. 20% churned.