CAC Calculator
Customer acquisition cost & LTV:CAC ratio
$5,000 of marketing that wins 50 new customers is a customer acquisition cost of $100. Enter your own sales and marketing spend and the customers it brought in to calculate CAC, and add lifetime value to see the LTV:CAC ratio that decides whether growth is profitable.
How CAC works
The cac formula behind this customer acquisition cost calculator is deliberately simple; what you put into it is the hard part.
Customer acquisition cost is everything you spent to win customers, divided by the number of new customers it produced. Spending $8,000 across sales and marketing to land 50 customers is a $160 CAC.
| Marketing | Sales | New customers | CAC |
|---|---|---|---|
| $5,000 | — | 50 | $100.00 |
| $5,000 | $3,000 | 50 | $160.00 |
| $5,000 | $3,000 | 100 | $80.00 |
| $20,000 | $15,000 | 100 | $350.00 |
The first two rows are the point. Adding $3,000 of sales cost that many companies leave out raises CAC by 60% on identical results. What you include decides the answer.
What belongs in the numerator
The honest version of CAC is fully loaded: everything spent on winning customers, not just the media bill.
| Include | Exclude |
|---|---|
| Paid media and ad spend | Customer support |
| Marketing salaries and benefits | Account management |
| Sales salaries and commission | Product development |
| Agency and contractor fees | Onboarding of existing customers |
| Marketing and sales software | General overheads |
| Content production, events | Expansion revenue efforts |
Ad-spend-only CAC is a useful channel metric and a misleading company metric. Salaries are usually the largest line for anything with a sales team, and a CAC that excludes them can be less than half the true figure. Whichever definition you use, label it and keep it consistent — a CAC that quietly changes definition between quarters is worse than no CAC at all.
The attribution window problem
The denominator is harder than it looks. Customers acquired this month were often influenced by spend from previous months, so dividing this month's cost by this month's customers is only fair when spend is roughly steady.
- Ramp up spending and CAC looks artificially high, because the customers that spend produces have not arrived yet.
- Cut spending and CAC looks great for a quarter, as customers from earlier spend keep landing.
- Long sales cycles make monthly CAC almost meaningless. Match the measurement period to the sales cycle: quarterly for B2B, monthly for e-commerce.
- Organic customers are the deepest question. Including them lowers CAC and flatters you; excluding them ignores that content and SEO cost real money. Reporting blended and paid CAC separately is the usual answer.
CAC only means something next to LTV
A $350 CAC is excellent for enterprise software and ruinous for a $30 product. The number is meaningless alone.
| CAC | LTV : CAC | Reading |
|---|---|---|
| $100 | 6 : 1 | Room to spend more |
| $150 | 4 : 1 | Strong |
| $200 | 3 : 1 | The usual target |
| $300 | 2 : 1 | Thin |
| $600 | 1 : 1 | Loses money overall |
Enter your LTV above to see the ratio. Note that a ratio well above 4:1 usually indicates underspending rather than excellence — you could profitably acquire more customers and are choosing not to. Work out lifetime value first with the LTV calculator.
Bringing CAC down
Because CAC is only spend ÷ customers, there are just two moves available: spend less, or convert more of the traffic you already pay for. The levers below are in rough order of how fast they move the number.
- Raise conversion rate before raising spend. Doubling conversion halves CAC at identical budget, and it is usually the cheaper lever. See the conversion rate calculator.
- Tighten the targeting. Clicks from people who were never going to buy inflate CAC faster than anything else. Narrowing audiences and excluding weak placements lowers cost per click and lifts conversion at the same time, so it hits the ratio from both ends.
- Cut the worst channels. Blended CAC hides enormous variation; one channel is often several times worse than the average.
- Referrals carry the lowest CAC of any channel by a wide margin, and almost nobody asks systematically.
- Use the channels with no per-click floor. Paid traffic has a price per visitor that never reaches zero; content and search do. They start slowly and then compound, pulling blended CAC down every month they keep working.
- Improve retention. It does not lower CAC but it raises LTV, which raises the CAC you can afford — the same effect on the ratio from the other direction.
- Shorten the sales cycle. Sales salaries are the biggest CAC input for B2B, so time is literally money here.
Two companies can report the same CAC and the same healthy LTV:CAC ratio and still be in completely different positions, because one earns the money back in four months and the other in eighteen. Watch the CAC payback period as you pull these levers: faster payback is what frees the cash to fund the next one.
Track CAC by channel and by segment rather than as one company number. The blended figure tells you whether things are working; the segmented figures tell you what to do about it.
What the CAC figure assumes
CAC is (marketing spend + sales spend) ÷ new customers acquired in the same period. The LTV:CAC ratio divides your entered lifetime value by that result.
- Same-period attribution. Spend and customers are matched within one period, which is only fair when spend is roughly steady. Ramping up overstates CAC and cutting back understates it, because customers lag the spend that produced them.
- What you include is your decision. The calculator takes two spend fields so you can separate media from fully loaded cost. A company-level CAC should include salaries; a channel-level one usually should not.
- Organic customers are counted if you include them in the denominator, which produces blended CAC. Excluding them gives paid CAC. Both are legitimate and they are not comparable to each other.
- Not modelled: multi-touch attribution, sales cycle lag, channel-level breakdown, and the difference between new and expansion revenue.
- Benchmarks for the LTV:CAC ratio are conventions rather than rules, and they assume gross-profit-based LTV.
Reviewed September 2026.
Figures reviewed . Every worked example on this page is checked against the calculator above.
CAC Calculator: frequently asked questions
How do I calculate customer acquisition cost?
Divide total sales and marketing spend for a period by the new customers acquired in that period. Spending $5,000 on marketing and $3,000 on sales to win 50 customers gives a CAC of $160.
What costs go into CAC?
Fully loaded: paid media, marketing and sales salaries, commission, agency fees, software, content and events. Exclude support, account management, product development and general overheads.
Should CAC include salaries?
Yes for a company-level figure. Salaries are usually the largest input for anything with a sales team, and an ad-spend-only CAC can be less than half the true number. Adding $3,000 of sales cost to a $5,000 media budget raises CAC by 60%.
What is a good LTV:CAC ratio?
Around 3:1. Below that, gross profit struggles to cover product, support and overheads as well as acquisition. Well above 4:1 usually means you are underspending on growth rather than performing exceptionally.
What is a good CAC?
There is no absolute answer. A $350 CAC is excellent for enterprise software and ruinous for a $30 product. CAC only means something next to lifetime value and payback period.
What is the difference between blended and paid CAC?
Blended divides total spend by all new customers including organic ones; paid counts only customers from paid channels. Blended flatters the number, paid ignores that content and SEO cost money. Report both.
How does attribution affect CAC?
Considerably. Customers arriving this month were often influenced by earlier spend, so ramping up makes CAC look high and cutting back makes it look good. Match the measurement period to your sales cycle.
How do I reduce CAC?
Raise conversion rate first, since doubling conversion halves CAC on the same budget. Then cut the worst-performing channels, build referrals, and shorten the sales cycle, which directly reduces the salary cost per customer.