Customer Acquisition Cost — CAC — is what it costs you to win one new customer. The payback period is how long it takes to earn that back in profit. If it takes longer than a customer typically stays, you are losing money on every customer you win.
Every customer costs something to win. This tool tells you how many months of gross profit it takes to recover that cost — and whether your business economics are working in your favour.
Growth & Retention
Part of the Nocrai Platform
This tool sits within the Growth & Retention pillar — it measures how efficiently acquisition spend converts into profitable customers, and how long the business must wait before that investment pays back. It connects directly to cash runway, contribution margin, and the decisions that determine whether growth is self-funding or cash-hungry.
1
About your business
This determines which calculation is right for you
How do most of your customers pay you?
Either way, this tool shows you how long it takes to recover what you spent winning each customer.
2
Your Numbers
Recurring / Subscription Business
Enter a plain number in your own currency.
Not sure what to include? →
What this is: Every pound or dollar spent on finding and winning customers last month — ads, agency fees, sales staff time, events, referral costs. If it exists because you are trying to get new customers, it counts.
Where to find it: Your accounts under marketing and sales cost lines. If you run ads, your ad platform dashboards will show spend by month. Staff cost should be prorated to the time spent on acquisition activity.
If you cannot separate this from other costs: Your books may not be categorised in a way that isolates acquisition spend. That gap means you are estimating your CAC rather than knowing it — and the estimate is usually too low. Book a free Clarity Call →
Calculated cost per customer:—
Average across all your paying customers. Enter a plain number in your own currency.
If customers pay quarterly or annually, divide by the number of months in their term.
Gross margin (not net profit) — what is left after direct costs only.
Not sure how to find this? →
What this is: The percentage of each customer payment that remains after you subtract the direct costs of delivering your service — materials, delivery labour, payment fees. It does not include rent, salaries for non-delivery staff, or general overhead.
Where to find it: Your profit and loss account — look for gross profit as a percentage of revenue. If you use accounting software, it should be in your P&L report.
If it is not in your accounts: Your books may not separate direct costs from overhead clearly enough to calculate this. That is a bookkeeping structure gap — without it you cannot know your true margin. If you have the accounts but cannot find this figure, a short conversation can help. Book a free Clarity Call →
%
Include only direct costs — materials, delivery, payment fees. Do not include rent or salaries.
Required for payback vs. lifespan comparison.
How long does a typical customer stay with you?
Your Result — Step 3
—
—
⚠ Critical — Read This
Cost to Win Customer
—
Gross Profit / Month
—
after direct costs only
Annual Gross Profit
—
Net Customer Value (pre overhead)
—
before fixed costs and overhead
How Do You Compare?
Range
Rating
What it means
Under 6 months
Excellent
Your growth can largely self-fund. Each customer starts contributing to profit fast.
6–12 months
Good
Healthy numbers. You need some cash reserves to fund growth, but the maths behind your business works.
12–18 months
Watch Closely
Growth is cash-hungry. Reduce acquisition cost or improve margin before scaling.
Over 18 months
Critical
Scaling at this cost level requires significant outside funding. Revisit pricing, costs, or how you find customers.
Payback Timeline vs. Customer Lifespan
What would change your result?
Adjust any lever below to model a scenario. Your scenario result will appear beneath.
Scenario Result
—
—
—
Scenario CAC
—
Scenario GP/Month
—
Scenario Annual GP
—
Scenario Payback
—
Scenario Payback Position
You just saw one number in five minutes, no spreadsheet. It is one of thirty-four that show your whole business the same way, in plain English.
Every client you win costs something to acquire. This calculator measures how long it takes to recover that cost — and shows you the ongoing value sitting in your existing client relationships, whether or not you currently charge for it.
Enter a plain number in your own currency.
Not sure what to include? →
What this is: Every pound or dollar spent on finding and winning clients last month — ads, agency fees, networking costs, sales staff time, referral payments. If it exists because you are trying to get new clients, it counts.
Where to find it: Your accounts under marketing and sales cost lines. If you run ads, your ad platform dashboards will show spend by month. Staff cost should be prorated to the time spent on acquisition activity.
If you cannot separate this from other costs: Your books may not be categorised in a way that isolates acquisition spend. That gap means you are estimating your CAC rather than knowing it — and the estimate is usually too low. Book a free Clarity Call →
Calculated cost per customer:—
Typical amount a customer spends in one purchase. Enter a plain number in your own currency.
Gross margin (not net profit) — what is left after direct costs only.
Not sure how to find this? →
What this is: The percentage of each sale that remains after you subtract the direct costs of delivering it — materials, packaging, fulfilment. Not your rent, not general staff salaries, not overhead.
Where to find it: Your profit and loss account — look for gross profit as a percentage of revenue. If you use accounting software, it should appear in your P&L report as a gross margin line.
If it is not in your accounts: Your books may not separate direct costs from overhead clearly enough to calculate this. That is a bookkeeping structure gap. If the information exists but you cannot find it, a short conversation can help. Book a free Clarity Call →
%
Include only what it costs to deliver this sale — materials, packaging, fulfilment.
Enter a plain number in your own currency. Leave blank if this does not apply.
Used to convert purchases into months. Required to calculate payback period.
Count each client once.
Any follow-on work counts.
Required for payback vs. lifespan comparison.
How long does a typical customer relationship last?
Your Result — Step 3
—
—
⚠ Critical — Read This
Cost to Win Customer
—
Gross Profit / Sale
—
after direct costs only
Annual Gross Profit
—
Net Customer Value (pre overhead)
—
before fixed costs and overhead
Lifetime value breakdown
Transactional gross profit: —
Ongoing income gross profit: —
Total lifetime gross profit: —
Less acquisition cost: — Net customer value (pre overhead): —
How Do You Compare?
Range
Rating
What it means
Under 6 months
Excellent
Your growth can largely self-fund. Each customer starts contributing to profit fast.
6–12 months
Good
Healthy numbers. You need some cash reserves to fund growth, but the maths behind your business works.
12–18 months
Watch Closely
Growth is cash-hungry. Reduce acquisition cost or improve margin before scaling.
Over 18 months
Critical
Scaling at this cost level requires significant outside funding. Revisit pricing, costs, or how you find customers.
Payback Timeline vs. Customer Lifespan
What would change your result?
Adjust any lever below to model a scenario. Your scenario result will appear beneath.
Scenario Result
—
—
—
Scenario CAC
—
Scenario GP/Sale
—
Scenario Annual GP
—
Scenario Payback
—
Scenario Payback Position
You just saw one number in five minutes, no spreadsheet. It is one of thirty-four that show your whole business the same way, in plain English.
This tool is provided for informational and educational purposes only. All results are projections based solely on the figures you enter and do not constitute financial, accounting, legal, tax, or business advice. You acknowledge that actual outcomes may differ materially due to market conditions, business decisions, regulatory changes, or factors not captured by this calculator. You agree not to make financial, investment, or business decisions based solely on this output. This tool is provided "as is" and "as available" without warranties of any kind, express or implied, including but not limited to accuracy, completeness, merchantability, or fitness for a particular purpose. To the fullest extent permitted by applicable law, Nocrai and its affiliates disclaim all liability for any direct, indirect, incidental, consequential, special, or punitive damages arising from your use of, reliance on, or inability to use this tool. For decisions affecting your business, consult a qualified professional licensed in your jurisdiction. Your use of this tool constitutes acceptance of these terms.
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Starter ProCAC Payback Calculator