Churn Rate Calculator
Enter your starting subscriber count, how many you lost this month, new adds, and average revenue per subscriber. See monthly churn, annualized churn, subscriber lifespan, revenue lost to churn, and what a 10% churn reduction unlocks. Built for subscription businesses, memberships, and SaaS sellers.
Instant calculations · Editable fee assumptions · Export-ready results
Inputs
Values update results instantly. Adjust fee assumptions to match your seller dashboard.
Subscribers
Subscribers at beginning of month.
Subscribers lost this month
New subscribers added this month
Revenue
Monthly revenue per subscriber.
Costs
CAC per subscriber.
Results
Live estimates based on your inputs and editable fee assumptions.
Monthly churn rate
6.0%
Percent of starting base lost.
Annualized churn rate
52.4%
Compounded yearly churn if monthly rate held.
Avg subscriber lifespan (months)
16.67
1 divided by monthly churn rate.
Revenue lost to churn
$870.00
Lost subs times ARPU.
Net subscriber change
15
New minus lost.
Ending subscribers
515
Start - lost + new.
Churn cost (lost + CAC waste)
$1,320.00
Revenue lost plus CAC spent on churned.
Annual impact of 10% churn reduction
$1,044.00
Subs saved per month times ARPU times 12.
What this means
Monthly churn 6.00%, annualized 52.4%. Lifespan 16.7 months. Lost $870/mo revenue + $450 CAC waste. Net +15 subs. Cutting churn 10% saves 3.0 subs/mo = $1044/yr.
Subscriber movement this month
Interactive breakdown of fees, costs, and remaining profit.
Distribution
- Retained$470.0086.2%
- Lost$30.005.5%
- New$45.008.3%
Total $545.00 · 3 segments · interactive
Line-item breakdown
Dollar amounts, share of revenue, and visual proportion.
- Monthly churn rate
- 6.0%
- Annual churn rate
- 52.4%
- Avg lifespan months
- 16.67
- Revenue lost monthly
- $870.00
- CAC wasted
- $450.00
- Total churn cost monthly
- $1,320.00
- Net subscriber change
- 15
- 10% reduction saves per month
- $87.00
- 10% reduction annual impact
- $1,044.00
Assumptions used
- • 30 lost of 500 start = 6.00% monthly
- • Annual 1-(1-0.0600)^12 = 52.4%
- • Revenue lost 30×$29.00=$870.00
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Churn Rate Calculator
Generated 8/4/2026, 2:50:32 PM · Currency USD
Inputs
- Starting subscribers this month: 500
- Subscribers lost this month: 30
- New subscribers this month: 45
- Average revenue per subscriber: 29
- Acquisition cost per subscriber: 15
Results
- Monthly churn rate: 6.0%
- Annual churn rate: 52.4%
- Avg lifespan months: 16.67
- Revenue lost monthly: $870.00
- CAC wasted: $450.00
- Total churn cost monthly: $1,320.00
- Net subscriber change: 15
- 10% reduction saves per month: $87.00
- 10% reduction annual impact: $1,044.00
Interpretation
Monthly churn 6.00%, annualized 52.4%. Lifespan 16.7 months. Lost $870/mo revenue + $450 CAC waste. Net +15 subs. Cutting churn 10% saves 3.0 subs/mo = $1044/yr.
How it works
Methodology & formulas
This calculator is transparent by design. Review the steps and formulas so you can trust the estimate and adjust assumptions when your dashboard differs.
Calculation steps
- 1Divide lost by starting for monthly churn rate.
- 2Compounding monthly retention over 12 months gives annual churn.
- 3Reciprocal of churn rate yields average customer lifetime months.
- 4Multiply lost by ARPU for revenue lost, plus CAC waste for total churn cost.
- 5Calculate savings from reducing churn 10% and extrapolate to annual revenue.
Formulas
- monthlyChurn = lost / starting × 100
- annualChurn = (1 - (1 - monthlyRate)^12) × 100
- lifespan = 1 / monthlyRate months
- revenueLost = lost × ARPU
- churnCost = revenueLost + lost × CAC
- 10% saving annual = lost×0.10×ARPU×12
Important assumptions
- Monthly churn = lost / starting.
- Annual churn = 1 - (1 - monthlyRate)^12.
- Avg lifespan = 1 / monthly churn rate months.
- Revenue lost = lost × avg revenue per subscriber.
- CAC waste = lost × acquisition cost per subscriber.
- 10% reduction saves lost × 10% subs monthly.
Worked example
500 subscribers with 6% churn
500 start, 30 lost, 45 new, $29 ARPU, $15 CAC. Monthly 6%, annual 52.4%, lifespan 16.7 months.
FAQ
Common questions
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