Find your customer churn rate, retention rate, and average customer lifespan in seconds — and see how your retention stacks up. Free, private, no sign-up.
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Churn is the number that quietly decides everything else. It sets your average customer lifetime, which sets your LTV, which sets what you can afford to spend acquiring anyone. The Parix.ai churn rate calculator gives you both customer and revenue churn, because they are not the same problem.
Customer churn = customers lost ÷ customers at the start of the period
Revenue churn = MRR lost ÷ MRR at the start of the period
Exclude customers acquired during the period from the denominator. Including them dilutes the rate and makes churn look lower than it is — particularly during a growth month, which is exactly when you want the truth.
These can point in opposite directions, and the gap is the interesting part.
Customer churn higher than revenue churn means you are losing small accounts. Uncomfortable but survivable.
Revenue churn higher than customer churn means you are losing your largest customers. That is the more serious problem and the one an average hides.
Track both. Either one alone can look acceptable while the business has a real problem.
| Segment | Healthy monthly churn |
|---|---|
| Enterprise B2B | Under 1% |
| Mid-market B2B | 1–2% |
| SMB B2B | 3–5% |
| B2C subscription | 5–7% |
Note how a monthly figure compounds. 5% monthly churn is roughly 46% annually — you replace nearly half your customer base each year simply to stay level.
The goal for subscription businesses. When expansion revenue from existing customers exceeds the revenue lost to cancellations, your revenue grows without a single new customer.
That is what net revenue retention above 100% describes, and it is the strongest position a subscription business can be in. The MRR and ARR Calculator breaks the movement down.
Customer success teams tracking whether retention work is landing. Founders who need the figure before an LTV calculation means anything. Investors reading a subscription business from the outside. Pair it with the LTV Calculator and the CAC Calculator.
Enter customers and revenue lost above. Check both figures — the gap between them is usually the story.
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