What Is Customer Retention Rate?
Customer Retention Rate (CRR) measures the percentage of existing customers a business keeps over a given period, excluding any new customers gained. It is one of the most important metrics for subscription businesses, SaaS companies, and any organization that depends on recurring revenue. A high retention rate signals satisfied, loyal customers and is far cheaper than constantly acquiring new ones.
How to Use This Calculator
Enter three numbers for the same time period (a month, quarter, or year): the number of customers you had at the start, the number you had at the end, and the number of new customers acquired during that period. The calculator instantly returns your retention rate, the count of retained customers, and your churn rate.
The Formula Explained
The standard CRR formula is:
$$\text{Retention Rate} = \frac{\text{Customers at End} - \text{New Customers Acquired}}{\text{Customers at Start}} \times 100$$
Subtracting new customers from the ending total isolates how many of your original customers stayed. Dividing by the starting count and multiplying by 100 turns that into a percentage. Churn rate is simply 100 minus the retention rate.
Worked Example
Suppose you began the quarter with 200 customers (\(S = 200\)), ended with 220 customers (\(E = 220\)), and acquired 40 new customers (\(N = 40\)). Retained = \(220 - 40 = 180\). $$\text{CRR} = \frac{180}{200} \times 100 = 90\%$$ Your churn rate is \(100 - 90 = 10\%\).
FAQ
Can retention rate exceed 100%? No. Because new customers are removed before dividing, the rate caps at 100% (when you lose zero original customers).
What is a good retention rate? It varies by industry, but SaaS companies often target 90%+ annually. Higher is almost always better.
How is retention different from churn? They are complements: retention measures who stayed, churn measures who left. They add up to 100%.
