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CAC Payback Calculator

How fast does each new customer pay for itself?

CAC payback is the months it takes to recover the cost of acquiring a customer from their gross margin contribution. Lower is better. Sub-12 months is healthy. Under 6 months is best-in-class. Drag the sliders. Watch the curve cross 100%.

<6mo
Best-in-class payback
<12mo
Healthy SaaS floor
18mo+
Cash flow trap
3:1
LTV : CAC floor pairs with payback
Estimated CAC Payback Period
0.0months
Months until acquisition cost is recovered. Expansion-adjusted, margin-aware.
Payback Health Check Verdict
0-6 mo Best 6-12 mo Healthy 12-18 mo Slow 18+ mo Broken
Healthy
SaaS

Sets sensible defaults. Transactional businesses (law, real estate) target much faster payback than recurring revenue models.

$150

Monthly revenue per active customer. For transactional businesses, use average order value.

Model default: $80-300/mo
80%

% retained after cost of delivery. SaaS hits 75-85%. Restaurants live at 15-25%. Margin is the real engine.

Model default: 75-85%
$400

Blended cost: paid media + sales headcount + content + tools, divided by net new customers won.

Model default: $300-500
70%

What % of CAC is paid media vs. organic, referral, content. Higher paid share means faster, more fragile growth.

Model default: 60-80%
1.5%

How fast each customer's monthly revenue grows from upsells, add-ons, usage. Negative means contraction.

Model default: 1-2%/mo
% CAC Recovered by Month 3
36%
Cumulative margin contribution as a share of CAC after the first quarter.
% CAC Recovered by Month 6
73%
Where the best-in-class line sits. If you cross 100% here, you have unfair economics.
% CAC Recovered by Month 12
156%
By month 12 you should be in pure profit territory. Below 100% is a yellow flag.
Annual Margin Per Customer
$1,440
Year-1 gross-margin dollars per customer, with expansion compounding monthly.
CAC Recovery Curve (0-24 months)
% CAC Recovered 100% Breakeven
Breakeven Month M5
100% Breakeven
How You Compare With the Model Defaults
Model default You
Payback Months Months to recover CAC (lower is better)
5.0 mo
ARPU Monthly revenue per customer (higher is better)
$150
Gross Margin % revenue retained after delivery cost (higher is better)
80%
CAC Cost to acquire a customer (lower is better)
$400
LTV : CAC Implied Rough ratio from your margin and expansion (higher is better)
3.0x
Sensitivity: which lever cuts payback the most?
Modeled against your current inputs
Operator Playbook
1 Margin moves payback faster than CAC. A 5 point margin lift typically cuts payback by 30 to 40 percent. A 20 percent CAC cut only buys you a 20 percent improvement. Fix delivery cost first, then media spend.
2 Push the breakeven inside one quarter. If your business can recover CAC inside 90 days, you can self-fund growth without raising or taking on debt. That is the goal. Run pricing, packaging, and onboarding against that single number.
3 Expansion revenue compounds payback wins. 1.5 percent monthly ARPU growth from upsells flips a 12 month payback to roughly 9 months. The upsell motion is more leveraged than the next paid channel.
4 Audit paid CAC share before it eats you. When paid media is 70 percent or more of CAC, every CPC rate hike shows up directly in payback. Build at least one organic or referral channel that can carry 20 percent of net-new growth.
5 If payback breaks 18 months, pause the channel that broke it. Do not cut total spend across the board. Find the single channel whose payback drags the blended number above 18, kill that one, and let the others keep running.

What happens next

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How this calculator works

What formula is this using?
The naive payback formula is CAC / (ARPU x GrossMargin), which gives you a flat-line payback in months. The naive formula misses expansion. We layer it back in by walking the cohort month by month, growing each customer's monthly revenue at your expansion rate, and stopping the clock the month cumulative margin crosses CAC. The recovery curve plots that walk all the way out to month 24 so you can see how fast you cross 100 percent.
Why is sub-6 months considered best-in-class?
Sub-6 month payback means a single new customer funds the next new customer inside one quarter, with cash left over. That is the regime where you can self-fund growth without external capital. Top quartile SaaS operators hit 5 to 8 months. Best-in-class transactional businesses (high-margin services) hit 1 to 3 months because each transaction is fully margin-recovered at first sale. Above 12 months you are running a cash-flow business pretending to be a growth business.
How is this different from LTV : CAC?
LTV : CAC is the long-run profitability ratio. Payback is the speed ratio. You can have a healthy LTV : CAC of 4 to 1 with a payback that takes 22 months. That math works on paper but suffocates cash flow. Payback tells you how fast capital recycles. LTV : CAC tells you how much profit a customer prints. You need both. Use this tool for payback, and the LTV calculator for the ratio.
Does paid CAC share actually change the payback math?
Not the math directly. The blended CAC number already includes paid spend. The reason we surface paid share is because paid CAC is volatile. CPC rates move with platform auctions and seasonality. If 70 percent of your CAC is paid, a 20 percent CPC hike makes your payback 14 percent worse overnight. We use paid share in the playbook tips to flag the fragility of your current ratio, not to alter the calculation.
Why does expansion make such a big difference?
Because it compounds. 1.5 percent monthly revenue growth per customer adds about 19 percent more annual margin per customer over a year. At 3 percent monthly growth you add 43 percent. Most operators model payback assuming flat ARPU for the customer's life, which is wrong. Real customers buy more over time if your product earns them more. Modeling expansion correctly is how SaaS companies with 4 percent monthly churn still print money.
What is in the detailed PDF report?
Five pages: (1) Your numbers with sensitivity table and 24 month recovery curve. (2) The model defaults for your industry side by side with your inputs. (3) The three specific levers most likely to cut your payback, ranked by ROI. (4) A pricing and onboarding audit checklist scoped to your industry. (5) An implementation roadmap for week 1 through day 90. No marketing fluff. We'll email it after you submit. Delivery time can vary. the form.