You kept 460 of your 500 starting customers, a 92% retention rate. That is healthy: most of your base stuck around, so growth came from new customers on top of a stable foundation rather than backfilling losses.
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Customer retention rate is the share of your existing customers you keep across a period. The formula subtracts new customers so the result reflects only the people you already had: ((customers at end minus new customers) divided by customers at start) times 100. If you started with 500 customers, ended with 520 and acquired 60 along the way, you retained 460, which is a 92% retention rate. The calculator above runs this math instantly from your own numbers.
The formula has three inputs: customers at the start of the period, customers at the end and new customers acquired during it. The step people forget is subtracting new customers. Without it, fresh signups paper over the customers who quietly left, and your retention rate looks better than reality.
Work through the example. You begin a quarter with 500 customers. Over the quarter you win 60 new ones, and you finish with 520 on the books. Subtract the 60 new customers from the 520 ending total to get 460 original customers retained. Divide 460 by your 500 starting customers and multiply by 100, and you land on a 92% retention rate. The flip side is churn: 100 minus 92 gives an 8% churn rate, the share of the original base that did not stick. Keep the period consistent so each calculation is comparable to the last.
Retention is cheaper than acquisition, and the gap is large. Winning a new customer means paying for ads, content, sales time and often a first-order discount to earn trust from zero. An existing customer already trusts you and already knows the product, so serving them again costs a fraction of that. Studies across industries consistently find acquisition runs several times the cost of retention, which is why a few recovered retention points can move profit more than the same money spent chasing new leads.
High retention also compounds. When most of your base stays, every new customer adds to a stable foundation instead of backfilling losses, so growth stacks period after period instead of running in place. A business holding 90% retention keeps far more of its base over a year than one at 75%, and that surviving base keeps buying, referring and expanding. Small, durable improvements in retention quietly become some of the highest-leverage growth you can buy.
Start with onboarding. The first days decide whether a customer reaches the moment they feel real value, so guide them to a clear first win quickly and remove friction from setup. Next, keep delivering value: customers stay when the product or service reliably solves the problem they hired it for, so watch for the points where people get stuck and fix them before they become reasons to leave. Finally, stay engaged: proactive check-ins, useful content and a fast, human response when something breaks all signal that you are paying attention. Watch your retention rate over consecutive periods rather than a single snapshot, and let the trend tell you whether those efforts are working. For a steady inbound pipeline that keeps your retained base growing, request a free SEO audit and we will map the opportunity with real data.
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