Churn Rate Calculator
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Measure how fast you are losing customers and revenue over a period, and see your retention rate at the same time. Add optional revenue figures to compute gross revenue churn. Everything runs in your browser.
What churn rate tells you
Churn rate is the percentage of customers — or revenue — you lose over a defined period, usually a month or a year. It is one of the most important health metrics for any subscription or recurring-revenue business, because even a strong acquisition engine cannot outrun a leaky bucket. A 5% monthly churn quietly costs you nearly half your customer base over a year if nothing is added back.
Its mirror image is the retention rate, which is simply 100% minus churn. Retention is often the more motivating way to frame the same number: "we keep 95% of customers each month" lands differently from "we lose 5%."
Customer churn vs revenue churn
This calculator handles both. Customer churn counts heads: how many logos left. Revenue churn counts dollars: how much recurring revenue walked out the door. The two can diverge sharply. If the customers you lose are small accounts, revenue churn will be lower than customer churn; if you lose a few whales, revenue churn can be far higher even though few customers left.
Because of that, revenue churn is usually the more important number for the business, while customer churn better reflects product-market fit and support quality.
- Customer churn % = customers churned ÷ customers at start × 100
- Customer retention % = 100 − customer churn %
- Revenue churn % = revenue churned ÷ revenue at start × 100
- Gross revenue retention % = 100 − revenue churn %
Getting the period and denominator right
Consistency is everything with churn. Always measure over a fixed window and use the count at the start of that window as your denominator. Do not add customers acquired during the period into the denominator — that understates churn and makes fast-growing companies look healthier than they are.
Two caveats worth knowing. First, this tool computes gross revenue churn; it does not add expansion revenue back, so it will not show net revenue retention (which can exceed 100% for great products). Second, monthly and annual churn do not convert by simply multiplying or dividing by 12, because churn compounds — a 5% monthly churn is roughly 46% annually, not 60%. Measure at the cadence you actually care about.
Frequently asked questions
Is a lower churn rate always better?
Yes, lower churn means you keep more customers and revenue. What counts as good varies by market: consumer apps tolerate higher churn than enterprise SaaS, where monthly churn under 1% is considered strong.
Why do my customer and revenue churn differ?
They weight losses differently. If your departing customers pay less than average, revenue churn is lower than customer churn; if you lose large accounts, revenue churn is higher. Comparing the two reveals which segment is leaving.
Does this show net revenue retention?
No. It calculates gross revenue churn and retention, which exclude expansion and upsell revenue. Net revenue retention adds expansion back and can exceed 100%.
How do I convert monthly churn to annual?
Churn compounds, so use 1 − (1 − monthly churn)^12 rather than multiplying by 12. This calculator reports the rate for whatever period you enter.
What if I gained customers during the period?
Keep the denominator as the customers you had at the start. New customers acquired mid-period should not be included, or your churn rate will be artificially low.
Is my data private?
Completely. All the math runs in your browser and nothing you enter is transmitted or stored anywhere.
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