Customer Churn Rate Calculator
From starting customers and customers lost in a period, compute the churn rate and the retention rate.
Input Data
Results
At a glance:Churn rate = customers lost / starting customers x 100%; retention = 100% - churn. Example: 1,000 start, 120 lost → 12% churn, 88% retention. Lower churn is better. WARNING: State the period (month/quarter/year) — a 2% monthly churn ≈ 21.5% annualised; distinguish customer churn from revenue churn (losing low-value customers may barely affect revenue). Reducing churn is usually cheaper than acquiring. Education, not advice.
Formula
Churn rate = customers lost / starting customers × 100%.
Retention rate = 100% − churn rate.
$$$Churn=\\dfrac{Lost}{Start}\\times100\\%$$$$$$Retention = 100\\% - Churn$$$How to Use
- Enter the starting customer count.
- Enter the customers lost in the period.
- View the churn and retention rates.
FAQ
What period should I use for churn?
State it explicitly (month, quarter or year) and keep it consistent. A 2% monthly churn looks tiny but annualises to over 20% (1 - 0.98^12 ≈ 21.5%). Always compare or set targets on the same period — never mix monthly and annual churn.
Is customer churn the same as revenue churn?
No. Customer churn counts how many customers left; revenue churn counts how much revenue left. If the lost customers are low-spend, revenue impact may be small; if you lose a few big accounts, revenue churn can be huge despite a low customer count. Subscription businesses should track both.
How do I reduce churn?
Find the causes and high-risk segments (inactive, complained, near renewal), then target retention: improve product experience, proactive outreach, renewal offers or loyalty rewards. Since keeping a customer usually costs far less than acquiring one, investing in retention often pays more.
Why is reducing churn usually cheaper than acquiring?
In most industries, retaining an existing customer costs far less than acquiring a new one (which needs ads, sales, discounts). And existing customers are likelier to upgrade and refer. High churn is a 'leaky bucket' — you spend dear money on acquisition just to refill losses. Fix the leak (lower churn) first; healthy growth combines low churn with steady acquisition.
What is net revenue churn?
Net revenue churn nets expansion (upgrades, cross-sell) from losses. If existing customers' growth offsets churn, net revenue churn can even be negative (revenue grows despite churn). So customer churn alone can under- or over-state the financial impact; analyse it alongside revenue dimensions.
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References
Content review: Calculatorism Finance Team. Results are for reference only; please refer to the relevant authorities for the official figures.