Where your computed retention rate falls and the loyalty story each band usually tells, with the matching churn alongside. These are rules of thumb, not standards — healthy retention varies sharply by business model and the period measured, so judge yours against your own trend and direct peers.
Range
What it typically suggests
Below 60%
High churn — more than four in ten of the original base lapses; growth depends on constant, costly acquisition.
60% – 75%
Moderate retention; the base holds but leaks enough that retention work would pay off quickly.
75% – 90%
Above-average for many ecommerce and subscription businesses — most customers stay and new ones are largely additive.
◀ your result (85.0%)
Above 90%
Strong stickiness, typical of well-fit subscriptions; the base compounds and lifetime value runs high.
Estimates only — not financial, tax, or professional advice.
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What it calculates: Retention Rate, Churn Rate, Customers Retained.
The correct formula is customers at the end less those acquired during the period, divided by customers at the start. Dividing end by start without removing new customers makes any growing business look like it retains everyone, and can even produce a rate above 100%.
retention rate = (customers at end − new) / customers at start × 100
Starting with 1,000, ending with 1,100, having acquired 300 means you retained 800 of the original 1,000 — an 80% rate, not 110%. The naive version hides a fifth of the base walking out.
They always sum to 100%, so pick one and be consistent
Churn is simply the complement of retention, and the calculator reports both because teams habitually quote different ones. There is no information in one that is absent from the other.
What does differ is emphasis. Retention frames the customers you kept and suits a board update; churn frames the ones you lost and suits a working session about why.
Monthly and annual retention are wildly different numbers
A 95% monthly retention rate sounds excellent and implies about 54% survival across a year, because the losses compound. Quoting a monthly figure against an annual benchmark is the most common error in this metric.
Choose the period that matches your purchase or billing cycle, state it every time the number is quoted, and never convert between the two by multiplying.
An active account and a paying one are different populations
For a subscription, retention is unambiguous — the subscription either renewed or it did not. For a shop with no contract, you have to define activity, and where you draw that line moves the number substantially.
Whatever definition you choose, freeze it. A retention series that improves because the activity window widened from 90 days to 180 is measuring the definition, not the business.
Frequently Asked Questions
How do I calculate customer retention rate?
Subtract new customers from your end count, divide by the start count, and multiply by 100. With 1,000 at the start, 1,100 at the end, and 250 new, retention is (1,100 − 250) / 1,000 = 85%.
Why subtract new customers?
Because retention measures how well you keep existing customers, not how many you add. Leaving new customers in would mix acquisition with retention and hide losses in your original base.
What is the relationship between retention and churn?
They are two sides of the same coin: churn rate is 100% minus retention rate. An 85% retention rate means a 15% churn rate over the same period.
What is a good retention rate?
It depends heavily on the business model. Subscription and consumable businesses target high retention, while categories with naturally infrequent purchases see lower figures. Track your own trend rather than a generic target.
How can I improve retention?
Deliver a reliable product and experience, communicate after the sale, reward loyalty, and fix the issues that drive cancellations. Small gains in retention compound into large gains in lifetime value.
Does the time period matter?
Yes. Retention measured monthly will look higher than the same business measured annually, because there is less time for customers to lapse. Always report the period alongside the rate.
How does retention affect lifetime value?
Higher retention extends the average customer lifetime, which directly raises lifetime value. Because retained customers cost little to serve, even modest improvements can lift profitability significantly.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Results are estimates for planning and analysis based on the figures you enter. They are not accounting, tax, or financial advice — verify with your own records and a qualified professional before making decisions.
Built and maintained by Jay Sudha, who runs a rice mill and trading business in Kashipur, India, and works with pricing, margins, working capital and bank credit as part of it.
Published the calculator with its formula, worked example, assumptions, limitations and a bespoke guide, and added an automated formula test suite covering it.
Tested retention as end customers less newly acquired, over the starting base, and the churn rate as its complement.
Tested that retention and churn always sum to one hundred, and that a growing base cannot produce a rate above one hundred.
Frequently Asked Questions now show on the page: 7 answers, checked in a page-by-page audit.
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