CAC Payback Period Calculator
CAC Payback Period measures the exact number of months required for a customer's gross margin contribution ARPA × (GM / 100) to fully recover Customer Acquisition Cost CAC.
Months required to break even on customer acquisition cost
Fully loaded sales & marketing cost per new logo
Average monthly recurring revenue (MRR) per customer
Subscription gross margin percentage
Step-by-Step Calculation
CAC Payback Period measures the exact number of months required for a customer's gross margin contribution ARPA × (GM / 100) to fully recover Customer Acquisition Cost CAC.
Real-World Reference Values
Rapid capital recycling for self-serve acquisition
Institutional venture efficiency standard
Higher upfront CAC offset by >115% net dollar retention
20-Row Comparison Table
CAC Payback Period (PB (mo)) · Customer Acquisition Cost (CAC)
| # | Customer Acquisition Cost ($) | CAC Payback Period (mo) | Δ % |
|---|---|---|---|
| 01 | 50 $ | 0.166667 mo | -98.61% |
| 02 | 2,045.69 $ | 6.819 mo | -43.18% |
| 03 | 3,600.00 $Current | 12 mo | 0.00% |
| 04 | 6,037.07 $ | 20.1236 mo | +67.70% |
| 05 | 8,032.76 $ | 26.7759 mo | +123.13% |
| 06 | 10,028.45 $ | 33.4282 mo | +178.57% |
| 07 | 12,024.14 $ | 40.0805 mo | +234.00% |
| 08 | 14,019.84 $ | 46.7328 mo | +289.44% |
| 09 | 16,015.53 $ | 53.3851 mo | +344.88% |
| 10 | 18,011.22 $ | 60.0374 mo | +400.31% |
| 11 | 20,006.91 $ | 66.6897 mo | +455.75% |
| 12 | 22,002.60 $ | 73.342 mo | +511.18% |
| 13 | 23,998.29 $ | 79.9943 mo | +566.62% |
| 14 | 25,993.98 $ | 86.6466 mo | +622.06% |
| 15 | 27,989.67 $ | 93.2989 mo | +677.49% |
| 16 | 29,985.36 $ | 99.9512 mo | +732.93% |
| 17 | 31,981.05 $ | 106.6035 mo | +788.36% |
| 18 | 33,976.74 $ | 113.2558 mo | +843.80% |
| 19 | 35,972.43 $ | 119.9081 mo | +899.23% |
| 20 | 37,968.13 $ | 126.5604 mo | +954.67% |
Frequently Asked Questions
Why must ARPA be multiplied by Gross Margin?+
Hosting, support, and payment processing costs consume (100% - GM%) of revenue; only gross margin dollars remain to pay back sales and marketing outlay.
How do I determine the maximum CAC my team can spend for a 12-month payback?+
Click SOLVE FOR on CAC and set PB = 12 alongside your current ARPA and Gross Margin.
Does upfront annual billing shorten CAC payback?+
While accounting payback stays identical, collecting 12 months of cash on day one reduces cash payback toward zero when PB ≤ 12 months.