Tool
Payback Period Calculator
How many months until your ad spend pays itself back? Enter CAC and monthly gross profit per customer. We'll calculate payback period, profit ramp, and where you cross your CAC line.
Your Unit Economics
Revenue minus COGS, not overhead
Sanity check — flags if monthly profit looks off
Enter your CAC and monthly profit to see your payback period
Months to Payback
0.0
Enter your numbersWhat your payback period means
Read your number against the cash you have on hand.
Under 6 months?
Aggressive but healthy — push harder on top channels because your cash recycles fast. Reinvest payback dollars into new acquisition every quarter and you'll compound spend without external capital.
6-12 months?
Standard for SaaS and DTC. Make sure you have working capital to fund the gap between spend and recovery — growth at this payback eats cash fast unless margin or pricing improves.
Over 12 months?
Look at your LTV-to-CAC ratio first. If it's above 3:1 you can survive long payback — if not, you need to cut CAC or improve product retention before scaling spend further.
Frequently asked questions
What's a healthy payback period?
Under 12 months is healthy for most SaaS, DTC, and B2B SMB businesses. Enterprise SaaS with strong retention can support 12-24 month payback. Anything beyond 18 months is risky unless your LTV-to-CAC ratio is meaningfully above 3:1.
How does payback differ from LTV : CAC ratio?
Payback measures time to recover cash. LTV-to-CAC measures lifetime profitability. You need both healthy: a 5:1 ratio with a 36-month payback can still strain working capital, while a 2:1 ratio with 4-month payback recycles cash fast but caps your scale.
Should I use gross profit or contribution margin?
Gross profit — revenue minus COGS. Don't subtract overhead, salaries, or fixed costs; those aren't variable per customer. The point of payback is to see how each new customer covers the cost of acquiring them, so only customer-specific costs belong in the calculation.
What about churn?
Payback assumes the customer stays through the recovery period. If your monthly churn is above 5%, multiply CAC by 1/(1-churn) to get an effective CAC that reflects survival probability. A 5% monthly churn means roughly 30% of cohorts won't reach 12-month payback.
How does Pace help?
Pace doesn't directly track customer-level payback (no CRM integration today), but it watches the ad-spend half of the equation. Daily budget pacing keeps a slow-payback channel from quietly burning months of working capital before you notice — and the Portfolio dashboard shows ROAS and CPA per account so you can spot which channels recover ad spend fastest.
Don't burn working capital while payback ticks down.
While Pace doesn't track customer-level payback, it watches the ad-spend side — pacing budgets daily so a slow-payback channel can't quietly run ahead of plan and torch months of working capital before you notice.
| This calculator | With Pace | |
|---|---|---|
| Granularity | Blended CAC and profit | Per ad account / campaign / ad group |
| Refresh | Manual, when you remember | Daily pacing against live spend |
| Action | Tells you the months | Caps overspend before payback breaks |
| Source data | What you type in | Live data from your ad accounts |