What is Cohort Analysis?
Definition + Examples
Definition
Cohort analysis is the practice of grouping customers by a shared characteristic — typically their acquisition date or acquisition channel — and tracking that group's behavior over time. Instead of looking at all customers as a single blended population, cohort analysis isolates how each cohort retains, spends, and churns. The most common visualization is a retention curve: percentage of each cohort still active in week 1, week 4, week 12, etc.
Why it matters for small businesses
Cohort analysis is the single most useful tool for understanding whether a business is actually getting better. Blended metrics (overall retention, blended LTV) can stay flat or improve even when newer cohorts are deteriorating, because older, healthier cohorts mask the trend. Cohort analysis exposes that. It's also how to evaluate whether a product or marketing change is working — if the post-change cohort retains better than the pre-change cohort at the same week, the change is helping.
Examples
SaaS retention regression
A SaaS company sees blended retention holding steady. Cohort analysis reveals that each new monthly cohort is retaining 2–3% worse than the prior one — a quiet regression that older cohorts were hiding. They identify and fix an onboarding bottleneck.
DTC repeat-purchase cohorts
A DTC brand cohorts customers by acquisition channel. Facebook-acquired customers have a 12% second-purchase rate; influencer-acquired customers have a 31% rate. They re-weight their acquisition spend.
Local gym member cohorts
A gym tracks 12-month retention by membership type. Annual prepaid members retain 78% at 12 months; month-to-month members retain 31%. They incentivize the annual plan and see a 40% lift in expected LTV.
How to use cohort analysis in your marketing
- 01Cohort by acquisition month at minimum. That's the baseline view every business should have.
- 02Add channel cohorts — different acquisition sources almost always produce different retention curves.
- 03Watch the slope, not just the level. A flat retention curve at any level is gold; a declining curve is a warning.
- 04Compare pre/post-change cohorts to measure whether interventions are working.
- 05Use cohort LTV, not blended LTV, to set CAC targets.
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Start freeRelated terms
Customer Lifetime Value is the total revenue (or, more rigorously, gross profit) a business can expect from a single customer over the duration of their relationship.
Customer Acquisition Cost is the total amount a business spends to acquire a single new customer, calculated by dividing the sum of all marketing and sales costs over a period by the number of new customers acquired in that same period.
Conversion rate is the percentage of users who take a defined desired action out of the total who had the opportunity.
Net Promoter Score is a customer satisfaction metric calculated from a single survey question: 'On a scale of 0–10, how likely are you to recommend us to a friend or colleague?' Respondents scoring 9–10 are 'promoters,' 7–8 are 'passives,' and 0–6 are 'detractors.