Customer Acquisition Cost Calculator
Customer acquisition cost is all sales and marketing spend divided by new customers won. Spend $42,000 on ads, salaries and software to win 60 customers and your CAC is $700. It only means something next to lifetime value — $700 is excellent at $5,000 LTV and fatal at $900.
Enter one period of numbers
Media, agency fees, software, content and creative production.
Loaded salaries, commission and tools for anyone selling. Enter 0 if you sell it yourself.
First-time paying customers in the same period.
Every new customer costs you $700.00, all in.
The part of acquisition cost that is people, not media.
CAC by channel
Blended acquisition cost hides which channel is paying its way. These are marketing-only figures — sales cost is shared across everything and cannot be honestly split by channel.
Cheapest is not the same as most scalable — check the volume next to it.
How to use this calculator
Marketing spend is everything you paid to create demand: media, agency or management fees, software, creative, content. Sales spend is everything you paid to convert it: loaded salaries, commission, phone systems, CRM seats. If you run the sales calls yourself and take no salary, enter zero and read the result as a marketing-only number.
New customers means first-time paying customers, not leads and not repeat orders from people you already had. Keep both sides of the division on the same period, and if your sales cycle is long, use a quarter rather than a month so spend and results roughly line up.
A worked example
A commercial services firm spends $30,000 on marketing and $12,000 on a salesperson in a quarter, and wins 60 new customers. CAC is 42,000 ÷ 60 = $700. Of that, $500 is marketing and $200 is sales.
The channel split tells a different story. Paid ads spent $18,000 for 22 customers, or $818 each. Search and content spent $9,000 for 21 customers, or $429. Referral spend of $3,000 produced 17 customers at $176. The blended $700 was hiding a channel costing nearly five times what the best one costs.
What a good and a bad result look like
Judge acquisition cost against what a customer is worth, not against other companies. If a customer generates $2,100 in gross profit over their life with you, a $700 acquisition cost is a 3:1 ratio — the conventional healthy mark. Under 1:1 you are paying more to win customers than they will ever return. Sitting at 6:1 or 8:1 usually means there is profitable growth being left on the table.
The second test is payback period. If a $700 customer returns $700 of gross profit in the first month, you can reinvest quickly and grow fast. If it takes eighteen months, the number can be technically fine and still starve the business of cash.
The mistake almost everyone makes
- Leaving people out. Media-only acquisition cost is not acquisition cost. Salaries and commission usually move the number by a third or more.
- Reading blended CAC as channel performance. Referral and repeat customers arrive nearly free and flatter the average, which conceals whichever paid channel is overpaying.
- Mismatching the period. With a ninety-day sales cycle, this month's customers came from last quarter's spend. Compare like with like or the number lies in whichever direction spend is moving.
- Counting renewals as new. Repeat business belongs in lifetime value, not in the customer count on the bottom of this fraction.
Where to look next
Acquisition cost is only half an answer. Run the customer lifetime value calculator to get the other half and see the ratio between them. If the number is too high and you want to know where in the funnel it went wrong, start with the cost per lead calculator and then the cost per booked job calculator.
Common questions
How do you calculate customer acquisition cost?
Add every dollar spent on sales and marketing in a period, then divide by the number of new customers won in that same period. The spend side includes media, agency and management fees, software, content production, and the loaded salaries and commissions of anyone whose job is to win new business. Leaving out people costs is the most common way the number gets understated.
What is the difference between CAC and cost per lead?
Cost per lead measures what it costs to get someone to raise their hand. Customer acquisition cost measures what it costs to get one of them to actually buy, and it includes the sales effort spent on everyone who did not. If ten leads at $50 each produce one customer, cost per lead is $50 and the marketing side of acquisition cost is $500 before a single hour of sales time is counted.
What is a good CAC?
A good acquisition cost is one that is comfortably below the gross profit a customer generates over their lifetime. The usual shorthand is a lifetime-value-to-CAC ratio of about 3 to 1, which leaves room for overheads and payback within a reasonable window. Below 1 to 1 the business loses money on every sale. Far above 5 to 1 often means the business is underspending and could profitably buy more customers.
Should salaries be included in CAC?
Yes. Anyone whose time goes into winning new customers belongs in the calculation — sales reps, appointment setters, the marketing coordinator, the share of a manager who oversees them — including payroll taxes and commission. Excluding salaries produces a media-only number that will look healthy right up until you notice the business is not making money.
Why is my blended CAC different from my paid-ads CAC?
Blended acquisition cost divides all spend by all new customers, including the ones who arrived by referral, repeat business, word of mouth or organic search and cost almost nothing to acquire. Those cheap customers pull the average down and hide what paid channels really cost. Track blended for board-level health and per-channel for any decision about where the next dollar goes.
How do you calculate CAC by channel?
Divide the spend attributable to one channel by the customers that channel produced. The hard part is attribution, not arithmetic — a customer who saw a Facebook ad, searched your name, read a review and then called is countable once, and whichever channel you credit will look better than it is. Pick one attribution rule, write it down, and apply it consistently so trends stay comparable even when the absolute numbers are debatable.
What time period should CAC cover?
Long enough to smooth out noise and to let spend catch up with its results — a quarter works for most businesses, a month only if volume is high. The trap is a long sales cycle: if it takes ninety days to close a deal, this month's customers came from spend made a quarter ago, so dividing this month by this month understates cost while spend is growing and overstates it while spend is shrinking.
How do you lower customer acquisition cost?
The fastest gains usually come from the middle of the funnel rather than the top. Improving close rate and speed of follow-up costs nothing in media and drops acquisition cost immediately. After that: cut the channels with the worst cost per customer rather than the worst cost per lead, tighten the offer so more of the same traffic converts, and build referral and repeat business, which arrives at close to zero acquisition cost and pulls the blended figure down permanently.
Keep going
The other half of the equation — what a customer is worth, and whether your LTV:CAC ratio holds up.
Free tool Cost Per Lead CalculatorThe stage before this one: what it costs to get someone to raise their hand at all.
Free tool ROAS CalculatorRevenue divided by ad spend, plus the break-even ratio your margin actually requires.
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