Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Blended CAC
$700.00
Paid CAC
$631.58
Cost per lead
$26.67
Lead to customer rate
6.67%
Share of customers from organic
36.7%
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter marketing spend ($/mo).
- 2Enter sales team cost ($/mo).
- 3Enter new customers.
- 4Enter of which came from paid.
- 5Enter leads generated.
- 6Read your blended cac on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Blended CAC divides all sales and marketing spend by every new customer, including organic ones. Paid CAC isolates the customers your ad spend actually bought — that is the number to optimise.
Worked example
Using the values the calculator loads with:
Inputs
- Marketing spend: 24000 $/mo
- Sales team cost: 18000 $/mo
- New customers: 60
- Of which came from paid: 38
- Leads generated: 900
Results
- Blended CAC: $700.00
- Paid CAC: $631.58
- Cost per lead: $26.67
- Lead to customer rate: 6.67%
- Share of customers from organic: 36.7%
What each field means
Inputs
- Marketing spend ($/mo)
- The marketing spend used in the calculation, measured in $/mo. Starts at 24000 $/mo so you have a working example on load.
- Sales team cost ($/mo)
- The sales team cost used in the calculation, measured in $/mo. Starts at 18000 $/mo so you have a working example on load.
- New customers
- The new customers used in the calculation. Starts at 60 so you have a working example on load.
- Of which came from paid
- The of which came from paid used in the calculation. Starts at 38 so you have a working example on load.
- Leads generated
- The leads generated used in the calculation. Starts at 900 so you have a working example on load.
Results
- Blended CAC
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Paid CAC
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Cost per lead
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Lead to customer rate
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Share of customers from organic
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the customer acquisition cost calculator work?
Blended CAC divides all sales and marketing spend by every new customer, including organic ones. Paid CAC isolates the customers your ad spend actually bought — that is the number to optimise. The underlying maths is: CAC = (Marketing + Sales spend) ÷ New customers.
What do I need to enter?
5 values: marketing spend, sales team cost, new customers, of which came from paid, and leads generated. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the blended cac result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Customer Acquisition Cost Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/cac
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/cac" target="_blank" rel="noopener">Customer Acquisition Cost Calculator — RevenueLab</a> (2026).</p>
Source: [Customer Acquisition Cost Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/cac) (2026).