Churn Cost & Retention ROI Calculator
What customer churn costs you each year, and the ROI of a retention program that cuts it.
Example scenario—not a forecast or verified benchmark. Enable JavaScript to edit inputs, view charts, save locally and export your analysis.
Example inputs
- Customers at the start of the year
- 1,200
- Customers lost during the year
- 300
- Average revenue per customer per month
- 350
- Gross margin
- 55
- Cost to acquire a replacement customer
- 900
- Churn reduction the program targets
- 5
- Annual cost of the retention program
- 60,000
Example results
Churn of 25% costs $1.5M a year in lost run-rate revenue and replacement CAC; cutting it 5 points returns 221% on a $60K retention program.
- Annual churn rate
- 25%
- Annual cost of churn (run-rate revenue + replacement CAC)
- $1,530,000
- Retention program ROI
- 221%
- Monthly churn rate
- 2.4%
- Revenue lost this year (partial-year)
- $630,000
- Customer lifetime value (gross profit)
- $9,240
- Customers saved per year
- 60
- Annual benefit of program
- $192,600
What stands out
Annual churn is 25% (2.37% a month)
The average customer stays about 4 years and is worth $9,240 in gross profit.
Churn removes $1.3M of annual revenue run-rate
300 lost customers × $4,200 a year. Replacing them costs another $270K in acquisition.
A 5-point churn cut returns 221% on a $60K program
It keeps 60 customers a year and lifts lifetime value from $9,240 to $11,550 per customer.
Break-even: the program must save 19 customers (1.6 pts of churn)
If you cannot credibly move churn that much, shrink the program or target only high-value accounts.
Next actions
- Interview or survey the last 20 churned customers and sort reasons into price, service, fit, and outside factors before spending on fixes.
- Set an early-warning trigger (missed visit, overdue renewal, complaint) and call those customers within 48 hours; that is where the 60 saves will come from.
- Fund the $60K program and measure churn monthly against the 20% target.
Model assumptions & limitations
- Churn rate = customers lost ÷ customers at the start of the year; monthly churn is the compounded equivalent.
- Lost customers are assumed to leave evenly through the year (half a year of in-year revenue lost) and to forfeit a full year of run-rate revenue.
- Program benefit counts one year of gross profit retained plus avoided replacement CAC; multi-year benefit is not included, so ROI is conservative.
- Customer lifetime is 1 ÷ churn, capped at 10 years.