What is Cohort Retention Analysis?

Cohort retention analysis is an advanced business evaluation technique where customers are grouped by their acquisition date (a cohort) and tracked over time. Rather than measuring average site-wide customer retention, cohort tracking reveals how long customers remain active and repeat purchases. Our Cohort Retention & LTV Simulator enables store owners and SaaS founders to forecast customer lifetime values (LTV) and compounding revenue schedules.

How to Calculate Cumulative Customer LTV

Customer Lifetime Value (LTV) represents the total gross revenue generated by a single customer before they churn. To calculate the cumulative LTV of a cohort over a specific time horizon, use the following formula:

Cumulative Cohort LTV = Total Cumulative Cohort Revenue / Initial Cohort Size

If a cohort of 1,000 customers generates $143,650 in total revenue over 6 months, the 6-month LTV is **$143.65** per customer.

Understanding Cohort Decay and Retention Curves

A cohort decay curve plots the decline in active customers over time. In e-commerce and subscription software models, decay is steepest in Month 2 (immediate churn) and flattens out in later months as loyal core cohorts remain active. Maintaining a flat retention curve in later months is the signature of high product-market fit.

Strategies to Maximize Cohort Retention

• Implement Post-Purchase Email Flows: Target new customers with automated email and SMS discount codes 30 days after their first order to secure repeat transactions.
• Build Subscription Offerings: Convert transactional e-commerce shoppers into monthly recurring subscribers, flattening the cohort decay curve.