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Retention Rate Calculator method
Define what it means to remain a customer before collecting counts. Use the same reporting scope and count each person once. The new-customer input must include only new customers present in the ending count.
CalculatorsFREE · NO SIGNUP
Retention Rate Calculator
Calculate customer retention from the customers you started with, ended with and acquired during one reporting period. Use a consistent customer definition and exclude new customers from the retained cohort.
FREE TO USEA LOOK ATLAS TOOL
01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Use one declared scenario.
LIVE RESULT
Customer retention rate
85.00%Count-based retention for one declared customer definition and period.RETAINED ORIGINAL CUSTOMERS850
ORIGINAL CUSTOMERS LOST150
NEW CUSTOMERS EXCLUDED250
18
GROWTH CAN HIDE LOST CUSTOMERS
Separate new arrivals from the people who stayed
A bigger customer total does not prove retention improved. Subtract the newly acquired customers who are included at period end before comparing the retained group with the starting group.
WORKING VIEW
85.00% RETENTIONSTART 1,000 · END 1,100 · NEW 250
METHOD(End customers − new customers) ÷ start customers × 100
WORKING NOTE850 of the original 1,000 customers remain; 150 are no longer in the retained cohort.
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
START 1,000 · END 1,100 · NEW 25085.00% RETENTION
850 of the original 1,000 customers remain; 150 are no longer in the retained cohort.
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Keep the inputs consistent
End minus new must be between zero and the starting count. Impossible populations are rejected instead of producing a rate above 100% or a negative retained cohort.
03
Use the result in your workflow
Keep the useful output beside the source values so another person can check the same scenario.
04
Know the limits of this tool
This count-based model does not calculate repeat-purchase rate, revenue retention, subscription churn or causal lift. A long enough observation period and a consistent customer definition remain your responsibility.
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Retention Rate Calculator method
Define what it means to remain a customer before collecting counts. Use the same reporting scope and count each person once. The new-customer input must include only new customers present in the ending count.
Keep the inputs consistent
End minus new must be between zero and the starting count. Impossible populations are rejected instead of producing a rate above 100% or a negative retained cohort.
Use the result in your workflow
Keep the useful output beside the source values so another person can check the same scenario.
Compare acquisition efficiency with the customer acquisition cost calculator using the new-customer count. Use the average order value calculator separately to measure basket value; retention is a customer-count rate rather than a revenue rate.
Know the limits of this tool
This count-based model does not calculate repeat-purchase rate, revenue retention, subscription churn or causal lift. A long enough observation period and a consistent customer definition remain your responsibility.
Questions, answered.
How does the retention rate calculator work?
Define what it means to remain a customer before collecting counts. Use the same reporting scope and count each person once. The new-customer input must include only new customers present in the ending count.
What should I check before using the result?
End minus new must be between zero and the starting count. Impossible populations are rejected instead of producing a rate above 100% or a negative retained cohort.
What does this tool leave out?
This count-based model does not calculate repeat-purchase rate, revenue retention, subscription churn or causal lift. A long enough observation period and a consistent customer definition remain your responsibility.
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