# Customer Retention Rate

## Quick Definition
The percentage of customers who continue doing business with you over a specific period, measuring loyalty and satisfaction.

---

## 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](/content/terms/churn-rate/index.html) 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.