Churn Impact Calculator

Why churn is the silent killer

Acquisition is visible. Churn is quiet. Every month, some customers leave. Most businesses don't notice until growth stops — because the leak has quietly offset every new customer acquired.

Churn compounds negatively. A 5% monthly churn rate loses 46% of your customer base in a year. A 10% monthly churn loses 72%. Reducing churn is often the highest-leverage move in a small business because it multiplies everything else — LTV, MRR, and profit.

The formulas

• Customers lost per month = current customers × churn rate
• Monthly revenue lost to churn = current revenue × churn rate
• Annual revenue lost = monthly × 12
• LTV per customer = ARPA ÷ churn rate
• LTV with target churn = ARPA ÷ target churn rate
• Value of churn reduction = LTV gain × active customers

Worked example

$5,000 MRR, 200 customers, 5% monthly churn, ARPA $25, target churn 3%:

• Customers lost per month: 10
• Monthly revenue lost: $250
• Annual revenue lost: $3,000
• LTV at 5% churn: $25 ÷ 0.05 = $500
• LTV at 3% churn: $25 ÷ 0.03 = $833
• LTV gain per customer: $333
• Total portfolio value gained (200 customers): $66,600

Reducing churn from 5% to 3% is worth more than $66,000 in lifetime value across your existing customer base. No acquisition channel comes close on a per-effort basis.

Churn benchmarks

• SaaS (SMB): 3–7% monthly
• SaaS (enterprise): under 1% monthly
• Subscription boxes: 5–10% monthly
• E-commerce repeat: 60–80% annual retention is healthy (i.e. 20–40% annual churn)
• Mobile apps: 90%+ churn in 30 days is common — but only if engagement is shallow

Why customers actually leave

1. No onboarding — they don't know how to use the product. Forget and cancel.
2. Unclear value — they can't say what the product does for them.
3. Price — too expensive for perceived value.
4. Lack of use — they don't engage, so they cancel.
5. Competitor — a cheaper or better alternative appeared.
6. Bugs / quality — a bad experience broke trust.
7. Business change — customer pivoted, downsized, or closed.

How to reduce churn

• Better onboarding. First 7 days matter more than the next 90.
• Regular value communication. Show them what they've accomplished with your product.
• Win-back campaigns. Reach out at 30, 60, 90 days before cancelling.
• Annual plans. Convert monthly subscribers to annual, reduces churn by 3–5×.
• Pause option. Let customers pause instead of cancel.
• Exit interviews. Ask why they left. Fix the top three reasons.
• Usage alerts. If a customer stops using, reach out immediately.

What this tool does not include

• Cohort-level churn (early vs late)
• Expansion revenue from retained customers
• CAC vs LTV ratio impact
• Churn reason breakdown
• Seasonality of churn

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