The retention rate measures what percentage of your customers stay with you over time. In retail and e-commerce, "staying" usually means making another purchase within a defined period—for example, the last 12 months.

It's the flip side of churn: if you retain 60% of your customers, you lose 40%.

Why does it matter?

A business that grows solely through new customers must continue to invest in advertising to maintain its sales. When customer retention improves, each customer makes more purchases, LTV (lifetime value) increases, and the cost of acquiring that customer is spread across more purchases.

Measuring it regularly shows you whether your customer loyalty initiatives are working or whether your relationship with your customers is weakening.

How is it calculated?

Formula: ((customers at the end of the period − new customers during the period) ÷ customers at the beginning of the period) × 100.

For example, you start the quarter with 1,000 active customers, add 300 new ones, and end with 900. The retention rate is ((900 − 300) ÷ 1,000) × 100 = 60%.

Story mode

Lucia reviews the numbers for her online sports store and sees that sales are growing, but customer retention is declining quarter by quarter. She realizes she's "filling a bucket with holes."

He decides to allocate part of the budget to a post-purchase workflow and a campaign targeting at-risk customers. The following quarter, more customers make repeat purchases without an increase in ad spending.

How to Use It with Data4Sales

Data4Sales calculates retention using data from all your sources, so a customer who makes a purchase online and then in-store is counted as the same customer thanks to Identity Resolution. In addition:

• You can see the entire lifecycle of your database and how it moves between states.
• The churn probability alerts you to who might leave before it happens.
• Active post-purchase, repurchase, and reactivation workflows via WhatsApp, email, or SMS.

Related terms

• Churn or cancellation rate
• Cohorts
• Customer Loyalty
• LTV