Retention Rate Calculator
Calculate customer retention rate and churn rate from beginning and ending customer counts.
To calculate retention accurately, you must isolate the effect of new customer acquisition. The formula subtracts new customers from the ending customer count to determine how many of the original customers remained, then divides by the starting count. For example, if you started with 1,000 customers, ended with 980, and added 50 new customers, your retained count is 930, yielding a retention rate of 93% and a churn rate of 7%.
Retention has a compounding effect on revenue and growth. Even small improvements in retention multiply over time because retained customers continue to generate revenue month after month. Research consistently shows that improving retention is five to seven times more cost-effective than acquiring new customers. This makes retention rate one of the highest-leverage metrics any business can optimize.
Tracking retention over time also helps identify seasonal patterns, the impact of product changes, and early warning signs of customer dissatisfaction. This calculator takes your starting customer count, ending customer count, and new customers added, then returns the retention rate, number of churned customers, and churn rate.
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How to Use
- Enter the number of customers at the beginning of the period
- Enter the number of customers at the end of the period
- Enter the number of new customers added during the period
- Click Calculate to see retention rate, churn rate, and churned customer count
- Track these metrics monthly to identify trends and measure improvement efforts
FAQ
How is retention rate calculated?
Retention rate is calculated as (Customers at End - New Customers) / Customers at Start x 100. This isolates the percentage of original customers who remained active, excluding any new acquisitions during the period.
What is the difference between retention rate and churn rate?
Retention rate and churn rate are two sides of the same coin. Retention rate measures the percentage of customers who stayed, while churn rate measures the percentage who left. They always sum to 100%. A 93% retention rate equals a 7% churn rate.
What is a good retention rate?
Good retention rates vary by industry and measurement period. For monthly SaaS retention, 95% or higher is considered excellent, meaning monthly churn of 5% or less. For annual retention in enterprise SaaS, 90% or higher is a strong benchmark. Consumer subscription businesses typically see lower retention rates than B2B SaaS.