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Free CAC payback calculator and customer acquisition payback tool. Compute blended CAC, monthly contribution, simple payback months, and churn-adjusted payback. Use with the CLV calculator and SaaS CAC calculator.
Last updated: May 24, 2026
Modeling churn impact? Churn impact calculator
Blended CAC
$1,574.29
Payback window: Healthy
Total Acquisition Cost
$220,400
Gross Profit per Customer / Mo
$212.8
Net Contribution per Customer / Mo
$164.8
Simple Payback
9.55 months
Churn-Adjusted Payback
10 months
Performance: Solid
Within common SaaS target (≤12 mo). Improve onboarding and expansion to compress payback further.
Payback Optimization Tips:
Answers: your true blended CAC, months to recover it, and how churn changes the timeline.
$1,574 CAC · CAC/ARPA 5.62× · onboarding $15,400.
$212.80 gross profit/mo · minus $48 support · $1,978/yr per customer.
9.55 mo simple · 10 mo churn-adjusted (+0.45 mo churn tax).
Default: $120,000 marketing · $85,000 sales · 140 new customers · $280 ARPA · 76% margin · 4.5% monthly churn.
Blended CAC
$1,574
Net contribution/mo
$164.80
Simple payback
9.55 mo
Churn-adjusted
10 mo
Healthy · Solid.
| Metric | Formula | Default example |
|---|---|---|
| Total acquisition cost | Marketing + Sales + (Customers × Onboarding) | $120K + $85K + $15.4K = $220,400 |
| Blended CAC | Total acquisition ÷ New customers | $220,400 ÷ 140 = $1,574 |
| Gross profit / customer / mo | ARPA × Gross margin % | $280 × 76% = $212.80 |
| Net contribution / mo | (Gross profit − Support) × Mode | $212.80 − $48 = $164.80 |
| Simple payback | CAC ÷ Net contribution | $1,574 ÷ $164.80 = 9.55 mo |
| Churn-adjusted payback | CAC ÷ (Net contribution × (1 − Churn)) | $1,574 ÷ $157.38 = 10.0 mo |
| Component | Amount | % of total |
|---|---|---|
| Marketing spend | $120,000 | 54.4% |
| Sales spend | $85,000 | 38.6% |
| Onboarding (140 × $110) | $15,400 | 7% |
| Band | Months | Guidance |
|---|---|---|
| Best-in-Class | ≤ 6 | Scale paid + sales if LTV:CAC holds |
| Healthy | 6 – 12 | Optimize expansion and onboarding |
| Extended | 12 – 18 | Cut CAC or raise net contribution |
| High Risk | > 18 | Pause scale — fix churn and CAC |
Blended CAC = (Marketing + Sales + Customers × Onboarding) ÷ CustomersNet contribution/mo = (ARPA × Margin − Support) × ModePayback (simple) = CAC ÷ Net contributionPayback (churn-adj) = CAC ÷ (Net contribution × (1 − Churn))CAC
$1,574
Simple
9.55 mo
Churn-adj
10 mo
Band
Healthy
$1,574 CAC · 9.55 mo simple · 10.0 mo churn-adjusted · Healthy · $220,400 total acquisition.
CAC
$220
Simple
2.53 mo
Churn-adj
2.61 mo
Band
Best-in-Class
$220 CAC · 2.61 mo payback · Best-in-Class — volume + low touch.
CAC
$650
Simple
2.6 mo
Churn-adj
2.65 mo
Band
Best-in-Class
$650 CAC · 2.65 mo · Best-in-Class.
CAC
$4,650
Simple
58.13 mo
Churn-adj
63.18 mo
Band
High Risk
$4,650 CAC · 63.18 mo · High Risk — fix retention before scale.
CAC
$10,900
Simple
13.97 mo
Churn-adj
14.26 mo
Band
Extended
$10,900 CAC · 14.26 mo · high CAC, high ARPA.
CAC
$1,574
Simple
9.55 mo
Churn-adj
9.75 mo
Band
Healthy
Churn-adjusted payback 9.75 mo vs 10 mo at 4.5% churn — 2% churn saves ~0.25 months.
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