Customer and user retention

Retention Rate Calculator

Calculate how much of a starting customer or user cohort remained through one period, separate acquisition from retention, and compare a target scenario.

Runs locally in your browser. No customer counts are uploaded or saved.

Customer retention rate

85.00%

August 2026

Retained from start

850

Churn complement

15.00%

Lost from start

150

Net customer change

-50

Formula shown

(950 − 100) ÷ 1,000 × 100 = 85.00%

Target scenario: 90.0%

Retain 50 more starting customers to reach the target.

That means retaining 900 starting customers and ending with 1,000 total customers if new acquisitions stay at 100.

Customer churn is shown as 100% minus retention for this same starting cohort. It is not revenue churn and does not reveal which customers or revenue were retained.

Transparent calculation

The retention rate formula

Subtract customers acquired during the period from the ending total to isolate people who could have belonged to the starting cohort. Divide that retained count by the starting cohort and multiply by 100.

Customer retention rate

(ending − new) ÷ starting × 100

Example: start with 1,000 customers, end with 950, and acquire 100 during the month. Retained customers are 850, so retention is 85%. The matching customer churn complement is 15%.

Measurement discipline

Keep the cohort and period consistent

The arithmetic is simple; the definitions determine whether the answer is useful. Document these choices before comparing periods or teams.

Define active consistently

Use the same rule for an active customer or user at both cutoffs. A paid account, login, purchase, or subscription renewal can produce different retention rates.

Align start and end cutoffs

Use one timezone, reporting source, and complete time window. Partial days and late-arriving events can distort short periods.

Separate new acquisitions

Subtract only customers who joined after the period began. Otherwise growth can hide losses from the starting cohort.

Decide how reactivations count

Choose whether returning customers are new, retained, or reported separately, then apply that policy to every comparison.

Interpretation and limits

Use the target as a planning scenario

The calculator converts a target percentage into a required retained-customer count. It does not predict behavior or prescribe a universal benchmark.

Retention versus churn

For the same starting cohort, customer churn is the complement of retention: 100% minus the retention rate.

Customer versus revenue retention

This page counts customers or users. Gross and net revenue retention use recurring revenue and require different inputs.

Compare like with like

A monthly product-user cohort should not be compared directly with annual contract renewals without explaining the different window and eligibility rules.

Segment before acting

An overall rate can hide differences by plan, channel, region, tenure, or use case. Calculate separate cohorts before deciding what to change.

Retention questions