The customer retention rate calculator turns existing customers, total customers, new customers into customer retention rate, attrition rate. It suits students checking a worked example, professionals sanity-checking a figure, and anyone who wants to see how the pieces of the calculation fit together.
What Is the Customer Retention Rate Calculator?
It is built around customer retention rate, attrition rate, and it works the same way whether you are checking a homework answer, confirming a colleague's figure, or working something out for yourself. Everything runs in your browser, so nothing you enter is uploaded anywhere.
How the Customer Retention Rate Calculation Works
Nothing is hidden: each output is worked out from the values above it, which makes it easy to see where a surprising answer came from.
The relationship between existing customers, total customers, new customers and customer retention rate, attrition rate is fixed, so the same figures always give the same answer. That makes it a good cross-check: run the numbers a second way and see whether the result agrees.
Getting a Result You Can Trust
The most common mistake is mixing units. Keep existing customers and total customers and new customers in the same system throughout, and make sure any rates or ratios are quoted per the same period. When a result looks far out of range, the units are nearly always the reason.
Frequently Asked Questions
What do I need to work out customer retention rate?
Enter existing customers, total customers, new customers. The calculator then works through the relationship and reports customer retention rate, attrition rate.
What does the customer retention rate actually calculate?
It takes existing customers and total customers and new customers and converts them into customer retention rate, attrition rate using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter existing customers?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.