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Seed Stage Retention Calculator

The Seed Stage Retention Calculator measures how much of an early customer cohort remains active after a selected period. It reports the retained customer count, lost customers, and retention and churn percentages so founders can separate acquisition momentum from genuine product stickiness.

Use a cohort that began under similar conditions, such as customers acquired in the same month or users who completed the same onboarding flow. The result is most useful when compared across cohorts and time windows rather than treated as a standalone score.

Cohort retention inputs

customers
customers
Result
—
of the original cohort remains active
Retained customers—
Customers lost—
Cohort churn rate—

1. Define one cohort
Use customers or users who started in the same period or completed the same milestone.

2. Enter the starting count
Record the cohort size at the beginning of the measurement window.

3. Enter the active count
Use the number that still meets your chosen definition of active at the end.

4. Review retention and churn
Compare the retained share with the customer losses shown in the breakdown.

5. Repeat consistently
Use the same activity definition and time window when comparing cohorts.

Retention rate (%) = Remaining active customers ÷ Starting customers × 100

Customers lost = Starting customers − Remaining active customers
Churn rate (%) = 100 − Retention rate

The cohort must use one consistent definition of “active.” This calculation measures logo retention, not revenue retention.

What the result means

A higher percentage means a larger share of the original cohort stayed active through the selected period.

Retention can change materially with the cohort definition, observation window, seasonality, and product stage.

Given: A cohort begins with 250 customers and 185 remain active after three months.

Calculation: 185 ÷ 250 × 100 = 74.0%. Customers lost = 250 − 185 = 65. Churn = 26.0%.

Result: The cohort retention rate is 74.0%, meaning nearly three quarters of the starting customers remained active.

Should I use customers or individual users?

Use the unit that best matches your business model, but keep it consistent across the starting and ending counts. Account-based products usually track customer logos, while consumer products often track users.

What counts as active?

Define activity before calculating, such as a login, paid subscription, completed order, or core product action. A stricter definition usually produces a lower but more meaningful retention rate.

Can retention exceed 100%?

Not for customer-count cohort retention, because the ending count cannot exceed the original cohort. Revenue retention can exceed 100% when expansion revenue is included, which is a different metric.

Which period should I measure?

Choose a period that fits the product’s normal usage cycle, such as 30, 90, or 180 days. Compare cohorts only when the periods are aligned.

How should I use the result?

Track the rate by acquisition source, onboarding path, customer segment, or product version. Changes between comparable cohorts can help identify where activation or ongoing value improved or weakened.