Short answer
Customer acquisition cost (CAC) is what you spend on sales and marketing to win one new customer: total sales and marketing cost for a period divided by the new customers won in that period. Paid CAC counts only media and campaign spend for the customers those channels won; fully loaded CAC adds salaries, commissions, tools and agencies, and is the one to plan with. Judge it against payback months and the LTV:CAC ratio.
- CAC formula: sales and marketing cost for a period ÷ new customers won in that period.
- Fully loaded CAC includes people; in the example below it's three times the paid figure.
- BLS data puts benefits at 30% of private-sector pay costs, so load salaries by about 1.43.
- CAC payback = CAC ÷ monthly gross profit per customer. Under 12 months is a common guideline.
- LTV:CAC above 3 is the usual rule of thumb, from SaaS investor David Skok.
On this page
- What customer acquisition cost means
- The CAC formula
- Paid, blended and fully loaded CAC
- What to include in fully loaded CAC
- Worked example: three CACs for the same quarter
- CAC payback and LTV:CAC
- Which lever moves it
- Related terms and common confusions
- Self-check before you report CAC
- Sources
- Questions people ask
This page is for founders, sales and marketing leaders and finance teams who need to know what a new customer really costs and whether that cost is affordable. It gives the formula, the costs to include, three versions of CAC, and payback and LTV:CAC worked through with real arithmetic.
What customer acquisition cost means
Customer acquisition cost is the average amount you spend on sales and marketing to win one new customer. It counts new customers only. Renewals and upsells to existing customers have their own costs and belong in a separate measure.
On its own, CAC tells you little. A $12,000 CAC is cheap for a customer who brings $100,000 of gross profit and ruinous for one who brings $5,000. That's why CAC is almost always read alongside payback and lifetime value.
The CAC formula
CAC = total sales and marketing cost in a period ÷ new customers won in that period
Three rules keep it honest:
- Same period, same scope. If you count sales and marketing spend for the quarter, count customers won in that quarter, and exclude expansion deals.
- Allow for the lag. If your sales cycle is about 90 days, this quarter's customers came mostly from last quarter's spend. When spend is rising, same-quarter CAC overstates the cost; when it's falling, it understates it. Compare both, or divide by spend lagged by one cycle. The sales cycle length benchmarks show how long B2B cycles typically run.
- Name the version. "Our CAC is $2,000" means nothing until you say what's in it.
Paid, blended and fully loaded CAC
| Version | Cost counted | Customers counted | Use it for |
|---|---|---|---|
| Paid CAC | Paid media and campaign spend for a channel | Customers won through that channel | Judging ad and event channels against each other |
| Blended program CAC | All program spend (media, events, data, tools) | All new customers, including referrals and organic | A quick trend line |
| Fully loaded CAC | All sales and marketing cost, including salaries, benefits, commissions, agencies, tools and programs | All new customers | Planning, pricing and judging whether growth pays |
Fully loaded is the version investors and finance teams expect, and the only one that answers "can we afford to grow this way?"
What to include in fully loaded CAC
| Cost | Include? | Note |
|---|---|---|
| Ads, sponsorships, events, direct mail | Yes | |
| Contact data, sales and marketing software | Yes | Split shared tools by use |
| SDR, account executive and marketing salaries | Yes, with benefits | Multiply base pay by about 1.43 (see below) |
| Commissions and bonuses for new business | Yes | Count them when earned, even if your accounts spread them over the contract |
| Sales and marketing leaders | Yes, for the share of time on new business | |
| Agencies, freelancers, content | Yes | |
| Account managers who only serve existing customers | No | Belongs in retention cost |
| Onboarding and implementation | Usually no | Track it as cost to serve, and say which choice you made |
Salaries cost more than the salary. In the Bureau of Labor Statistics' Employer Costs for Employee Compensation release for June 2026, private-industry employers paid $46.89 an hour in total compensation, of which wages were $32.82 (70.0%) and benefits $14.07 (30.0%). That's about 1.43 times wages ($46.89 ÷ $32.82), so a rep on $84,000 costs about $120,000 a year. Use your own payroll figures where you have them.
Worked example: three CACs for the same quarter
Illustrative example. The company and figures are invented to show the arithmetic.
Northbound Travel Management (northbound.example) runs business travel for mid-sized companies. In the third quarter it won 20 new corporate accounts. Its sales cycle is short enough that same-quarter figures are fair.
| Cost for the quarter | Amount |
|---|---|
| Search and LinkedIn ads | $24,000 |
| Trade events | $10,000 |
| Contact data and sales tools | $6,000 |
| Two SDRs ($56,000 base each): $28,000 × 1.43 | $40,040 |
| Two account executives ($84,000 base each): $42,000 × 1.43 | $60,060 |
| New-business commissions earned | $30,000 |
| Marketing manager ($88,000 base): $22,000 × 1.43 | $31,460 |
| Head of sales, half of time on new business ($140,000 base): $17,500 × 1.43 | $25,025 |
| Content agency | $15,000 |
| Total | $241,585 |
- Blended program CAC: ($24,000 + $10,000 + $6,000) ÷ 20 = $2,000.
- Paid CAC for ads and events: nine of the 20 accounts came through ads or events, so $34,000 ÷ 9 = $3,778.
- Fully loaded CAC: $241,585 ÷ 20 = $12,079.
The fully loaded figure is six times the blended program figure. Northbound's board deck had been quoting $2,000.
CAC payback and LTV:CAC
CAC payback (months) = CAC ÷ monthly gross profit per new customer
Lifetime value (LTV) = monthly gross profit per customer × expected customer lifetime in months
Use gross profit, not revenue: the cost of serving the customer isn't available to repay acquisition. A simple estimate of lifetime is 1 ÷ churn rate, so 20% annual churn means about five years.
Northbound's average new account brings $1,500 a month in fees at a 60% gross margin: $900 a month in gross profit. Accounts churn at 20% a year, so expected lifetime is 60 months and LTV is $900 × 60 = $54,000.
| Measure | Using blended program CAC ($2,000) | Using fully loaded CAC ($12,079) |
|---|---|---|
| Payback | 2.2 months | 13.4 months |
| LTV:CAC | 27 to 1 | 4.5 to 1 |
The program figure suggests a money machine. The fully loaded one says each account takes just over a year to repay its cost, slightly outside the guideline in David Skok's widely used SaaS Metrics 2.0 that recovering CAC should take no more than 12 months. The ratio, at 4.5 to 1, clears his other guideline that the best SaaS businesses have an LTV to CAC ratio above 3. Skok stresses these are guidelines, not laws, and they come from subscription software. For a business like Northbound they're a reasonable starting point.
Which lever moves it
| Change | Effect on Northbound |
|---|---|
| Win 24 accounts instead of 20 for the same cost | CAC falls to $10,066; payback 11.2 months |
| Cut annual churn from 20% to 15% | LTV rises to $72,000; LTV:CAC 6 to 1 (payback unchanged) |
| Raise monthly gross profit per account to $1,050 | Payback 11.5 months; LTV:CAC 5.2 to 1 |
Winning more of the deals you already work is usually the cheapest lever, and it depends on working the right accounts. Bebop finds companies that match a plain-language description of your best customers and explains why each one fits, so reps spend less time on accounts that were never going to buy.
Related terms and common confusions
| Term | What it means | How it differs from CAC |
|---|---|---|
| Cost per lead (CPL) | Spend ÷ leads | Stops at a lead; most leads never become customers |
| Cost per acquisition (CPA) | Ad spend ÷ conversions | The "acquisition" is often a sign-up or sale in one campaign, not a new B2B customer |
| CAC payback | CAC ÷ monthly gross profit per customer | Uses CAC as an input |
| LTV | Gross profit a customer brings over its lifetime | The other half of the LTV:CAC ratio |
| Cost to serve | Cost of onboarding and supporting customers | Comes after acquisition |
For how CAC fits with lead volume and channel costs, see lead generation.
Self-check before you report CAC
- You've named the version: paid, blended program or fully loaded.
- Salaries include benefits, and leaders are counted for their new-business share.
- Customers are new logos only, from the same period as the costs (or lagged by one cycle).
- Payback uses gross profit, not revenue.
- You've shown the figure by segment or channel, not only as one number.
Next step: see how win rate, deal size and cycle length combine into revenue per day with the sales velocity formula.
Sources
- Employer Costs for Employee Compensation, June 2026, US Bureau of Labor Statistics, 9 September 2026
- SaaS Metrics 2.0: A Guide to Measuring and Improving What Matters, David Skok, For Entrepreneurs, accessed 26 October 2026
Written by the Bebop team at Blackpearl Group. Last updated .
Questions people ask
How do you calculate customer acquisition cost?
Add up everything you spent on sales and marketing in a period, including salaries with benefits, commissions, tools, agencies and campaigns, and divide by the number of new customers won in the same period. For example, $241,585 of quarterly sales and marketing cost and 20 new customers gives a fully loaded CAC of $12,079. Exclude renewals and upsells, which have their own cost.
What should be included in CAC?
For fully loaded CAC, include advertising, events, content and agencies, contact data and sales software, salaries and benefits for SDRs, account executives and marketers, new-business commissions, and the share of leaders' time spent on new business. Leave out account managers who serve only existing customers. Onboarding is usually tracked separately as cost to serve. Whatever you choose, state it and keep it consistent.
What is a good LTV to CAC ratio?
The common rule of thumb is above 3 to 1, from David Skok's SaaS Metrics 2.0, which says the best SaaS businesses have a ratio higher than 3 and sometimes as high as 7 or 8. Calculate LTV from gross profit, not revenue, and CAC fully loaded. A very high ratio can mean you're underinvesting in growth; one below 1 means each customer loses money.
What is CAC payback period?
CAC payback is the number of months it takes a new customer's gross profit to repay what you spent to win them: CAC divided by monthly gross profit per customer. A $12,079 CAC and $900 a month in gross profit gives 13.4 months. A common guideline is 12 months or less. Longer payback means growth needs more cash up front and more trust that customers stay.
What is the difference between CAC and CPA?
Cost per acquisition (CPA) is an advertising measure: ad spend divided by conversions in a campaign, where a conversion might be a sign-up, a download or a purchase. Customer acquisition cost covers all sales and marketing cost, including people, divided by new paying customers. In B2B, CPA usually stops well before a signed customer, so CPA is usually far lower than fully loaded CAC.
How can you reduce customer acquisition cost?
Win more of the deals you already work by qualifying out poor-fit accounts early, raise conversion at the stage where most deals stall, and move budget from channels with high cost per customer to ones with low cost per customer. Referrals and expansion into existing accounts also lower costs. Recalculate payback after any change, because cheaper customers that churn faster aren't cheaper.