Add up sales and marketing spend per new customer and check the CAC payback.
Please do not make financial decisions based on these results.
What is the Customer Acquisition Cost Calculator – CAC Calculator?
Add up sales and marketing spend per new customer and check the CAC payback. To use the Customer Acquisition Cost Calculator – CAC Calculator, enter marketing spend, sales spend, new customers, monthly revenue per customer, gross margin; it returns customer acquisition cost, cac payback, monthly gross profit per customer, and shows them instantly as you type.
From impressions to profit
Every campaign is a funnel. Impressions become clicks (CTR), clicks become customers (conversion rate) and customers become profit (lifetime value less acquisition cost). The Online Marketing Conversion Calculator follows the whole funnel, and the ROAS Calculator tells you whether the ad spend paid back.
For subscriptions, watch retention first. A small drop in monthly churn lengthens customer lifetime and raises SaaS lifetime value sharply. Compare it with customer acquisition cost to see how fast each customer repays their cost.
- Paid media. CPC, CPM, CTR, CPA and ROAS are linked: change one and the others move.
- Subscription metrics. MRR, ARR, churn, net revenue retention and the quick ratio show growth quality.
- Creator income. AdSense, website ad and YouTube calculators estimate income from traffic and RPM.
How to use the Customer Acquisition Cost Calculator – CAC Calculator
- Enter your numbers. Start with Marketing spend ($), Sales spend ($), New customers, then fill in Monthly revenue per customer ($), Gross margin (%). Use real figures from your own records where you can. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the Customer acquisition cost, and the cards below show CAC payback, Monthly gross profit per customer. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the Customer Acquisition Cost Calculator – CAC Calculator using the default values shown in the calculator above:
Inputs
| Marketing spend ($) | 42,000 |
|---|---|
| Sales spend ($) | 28,000 |
| New customers | 140 |
| Monthly revenue per customer ($) | 120 |
| Gross margin (%) | 78 |
Results
| Customer acquisition cost | $500.00 |
|---|---|
| CAC payback | 5.3 months |
| Monthly gross profit per customer | $93.60 |
With these inputs the calculator returns Customer acquisition cost: $500.00. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Marketing spend ($) from 42,000 to 50,400 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Customer acquisition cost | $500.00 | $560.00 | +12% |
| CAC payback | 5.3 months | 6 months | +12% |
| Monthly gross profit per customer | $93.60 | $93.60 | 0% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the Customer Acquisition Cost Calculator – CAC Calculator reports Customer acquisition cost, cac payback and monthly gross profit per customer. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. The result is only as accurate as the numbers you enter and the formula shown above. It is for information, not financial, tax or legal advice.
Frequently asked questions
What CAC payback is healthy?
SaaS companies often target under 12 months of payback.
Do these calculators connect to my analytics?
No. You type in your own figures, and nothing is sent to our servers.
What is a good LTV to CAC ratio?
Three to one is the usual benchmark: each customer should return about three times what it cost to win them.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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