CAC Calculator
Customer acquisition cost.
Customer acquisition cost.
How to use CAC Calculator
- Enter your total sales and marketing spend and new customers acquired
- Add an optional lifetime value and pick your currency
- Read your CAC, LTV:CAC ratio, and net value per customer
About CAC Calculator
The CAC Calculator finds your customer acquisition cost by dividing your total sales and marketing spend for a period by the number of new customers you won in that same window. Type in the spend and the customer count and it returns cost-per-customer instantly, whether you are pulling the spend figure from Google Ads alone or a fully loaded budget that also covers salaries, agency fees, and software.
Add your customer lifetime value and it goes further: it works out your LTV:CAC ratio — the number growth teams watch most — and gives a quick health read against the roughly 3:1 benchmark, so you can see at a glance whether each customer earns back what you paid to acquire them. It also shows the net value left per customer after acquisition cost, which is a plain way to sanity-check payback before you scale a channel.
You can display every result in USD, EUR, GBP, CAD, AUD, INR, JPY, or BRL; only the formatting changes, never the math. Note that this is the marketing metric — customer acquisition cost — not the coronary artery calcium (CAC) heart score, so if you came looking for a medical result this is not the right tool. It is completely free with no sign-up and no limits, and every calculation runs entirely in your browser — your spend, customer, and lifetime-value numbers are never uploaded, stored, or shared.
Frequently asked questions
- How do you calculate customer acquisition cost (CAC)?
- CAC is your total sales and marketing spend for a period divided by the number of new customers acquired in that same period. For example, spending $10,000 to acquire 200 customers gives a CAC of $50 per customer. The calculator does this instantly and guards against dividing by zero.
- What is a good LTV:CAC ratio?
- A widely cited benchmark is around 3:1 — meaning each customer is worth about three times what it costs to acquire them. Below roughly 3:1 your acquisition is eating into margin, while a ratio well above 5:1 can be excellent but may also hint you are under-investing in growth. Enter your customer LTV to see your ratio and a health note.
- How do I calculate the LTV to CAC ratio?
- Divide your customer lifetime value by your customer acquisition cost. If a customer is worth $600 over their lifetime and costs $150 to acquire, your LTV:CAC ratio is 4:1. Enter both figures and the calculator works out the ratio and flags whether it looks healthy.
- What should I include in sales and marketing spend?
- Include the full cost of acquiring customers over the period: ad spend, marketing tools and software, salaries and commissions for sales and marketing staff, agency fees, and content or creative costs. Using total spend rather than ad spend alone gives a truer, fully loaded CAC.
- Does the CAC calculation include Google Ads spend?
- It includes whatever spend figure you enter. If you only run Google Ads, put in that ad spend and your new-customer count for the same period. For a fully loaded CAC, add your other channels, tools, and team costs into the spend total as well.
- What does net value per customer mean here?
- It is your customer lifetime value minus your customer acquisition cost — the money left over from each customer after you have paid to win them. A positive figure means acquisition is profitable per customer; a negative one means each new customer currently loses money.
- What time period should I use for CAC?
- Use the same period for both spend and new customers — a month, quarter, or year — so the two line up. Many teams calculate CAC monthly to track trends, but pick whatever window matches how you report marketing spend and new-customer counts.
- Can I calculate CAC in a currency other than US dollars?
- Yes. Use the currency selector to display results in USD, EUR, GBP, CAD, AUD, INR, JPY, or BRL. The math is identical — only the currency formatting of your results changes.
- Is this the MESA coronary artery calcium (CAC) score calculator?
- No. This tool calculates customer acquisition cost, the marketing and business metric, not a coronary artery calcium score. If you are looking for a MESA or CAC heart-risk percentile, this is not the right calculator — please check a medical resource or ask your doctor.
- Is this CAC calculator free?
- Yes, it is 100% free to use with no account, no sign-up, and no usage limits. You can run as many calculations as you like.
- Is my data uploaded or stored anywhere?
- No. The calculator runs entirely in your browser using JavaScript. Your spend, customer counts, and lifetime value figures never leave your device — nothing is uploaded to a server, saved, or shared.