HesapHanem

Customer Retention Rate Calculator

Enter customers at start, customers at end, and new customers acquired to find the retention rate.

How it is calculated

The tool applies retained = E − N, retention = retained ÷ S × 100 and churn = 100 − retention. Here S is the number of customers at the start of the period, E is the number at the end (including newcomers) and N is the number of new customers won during the period. Customer counts are plain numbers, and the results are percentages with two decimals plus the retained headcount. The start count must be at least 1; end and new counts cannot be negative. If end minus new is below zero (fewer customers at the end than were won during the period), or more than the start count (more customers retained than you began with), the counts contradict each other and the tool returns no result instead of a retention rate below 0% or above 100%.

Worked example

A subscription business starts the quarter with 1,000 customers, ends it with 1,050 and signed 200 new ones. Step 1: retained customers = 1,050 − 200 = 850. Step 2: retention = 850 ÷ 1,000 × 100 = 85%. Step 3: churn = 100 − 85 = 15%. The tool shows 85.00% retention, 15.00% churn and 850 customers retained. Headcount grew by 5%, but 150 of the original customers left.

Try this example →

Common mistakes

  • Forgetting to take new customers into account: 1,050 ÷ 1,000 suggests 105% retention, which hides the 150 customers that left.
  • Including customers who joined and left within the same period in the end or new count, which distorts the retained figure.
  • Treating retention and net growth as the same thing — a business can grow in size while its retention rate is falling.
  • Comparing a monthly figure with an annual one; keep the period length the same when you track the trend.
  • Entering the start count as the average of start and end, when the formula needs customers at the very beginning of the period.

Sources

About this calculator

Customer retention rate measures the share of a company’s existing customer base that stays through a given period, calculated as (customers at period end − new customers acquired during the period) ÷ customers at the start of the period, expressed as a percentage. Subtracting new customers matters because without it, strong new-customer growth could mask serious churn among the customers a business already had.

Retention rate is the mirror image of churn rate (100% minus retention roughly equals churn), and because acquiring a new customer typically costs far more than keeping an existing one, even small improvements in retention tend to have an outsized effect on long-term revenue and customer lifetime value. Subscription businesses, SaaS companies and customer-success teams track this metric monthly or annually as a core health indicator alongside churn and lifetime value.

Was this helpful?

You can pick up to 3 reactions.

Comments (1)

  • Editorial team

    Retention here is customers at the end, minus those newly acquired, divided by customers at the start. A result above 100 percent means the inputs do not fit together, since you cannot keep more customers than you began with. Compare only periods of the same length, because yearly and monthly figures are not interchangeable. How do you count a customer who pauses?

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators