How to calculate what a new customer actually costs you
Cost per lead is easy to find and rarely the number that matters. Here is how to calculate what a new customer really costs, with a calculator you can use on your own figures.
Customer acquisition cost is everything you spent to win new business in a period, divided by the number of new customers who paid you in that period. Include media, agency and vendor fees, tools, content, and the share of your team's time spent on new business. Count customers from your invoices, not from the ad platforms.
Ask most companies what a new customer costs and you will hear one of two answers. The first is a cost per lead taken from an advertising report. The second is a pause. Neither is a reason for embarrassment. The number is genuinely harder to produce than it should be, because the costs live in one system and the customers live in another.
It is also the single most useful figure in any discussion about growth. Without it, no channel can be judged, no budget can be defended, and no comparison with what a customer is worth can be made. This article explains how to calculate it properly and what usually goes wrong.
The formula
The calculation itself is simple: total cost of winning new business, divided by the number of new customers won, over the same period. The difficulty is in deciding what belongs on each side of the division.
The real cost of a customer is 22 times the cost per lead the report shows.
What to include in the cost
The test for each cost is simple: would you have spent it if you were not trying to win new customers? If not, it belongs in the calculation.
- Media and advertising spend across every channel, including sponsorships and directory listings.
- Agency, freelancer and vendor fees for work aimed at new business: campaign management, content, design, search.
- Tools and software used mainly for marketing and prospecting, such as the email platform, the CRM and scheduling tools.
- Events and travel aimed at meeting prospects.
- People. Marketing salaries in full, and the share of sales and leadership time spent on prospects rather than existing clients. This is the item most often left out, and often one of the largest.
Costs related to serving existing clients, such as account management, belong in the cost of retention, not acquisition. Keeping the two separate lets you see each clearly.
What counts as a new customer
A new customer is someone who paid you for the first time during the period. Count them from your invoicing or accounting system. Do not count leads, form fills, signed proposals that never turned into an invoice, or existing clients who bought a new service. Those are useful numbers, but they answer different questions.
If the customers come from the ad platform and the costs come from the ad platform, you have measured the ad platform, not the business.
Five common mistakes
- Using media spend only. It produces a flattering number and makes channels that need staff time, such as events or outbound, look cheaper than they are.
- Counting leads or platform conversions as customers. The ad platforms cannot see your invoices. Their conversions are usually actions, not purchases, and more than one platform may claim the same buyer. See how to tell which channel brings customers.
- Measuring over too short a period. In most service businesses, spend in one month produces customers weeks or months later. Use a rolling twelve months.
- Mixing very different customers. If you sell both small one-off projects and large ongoing contracts, calculate the cost separately for each. A single average hides both.
- Calculating it once. Acquisition cost moves with prices, competition and how well your team converts. Recalculate it every quarter.
Blended and per-channel cost
The calculation above gives a blended cost across all channels. That is the right starting point because it is the most reliable. Per-channel costs are useful next, but only as reliable as your ability to trace each customer back to the channel that produced them. Where that tracing is weak, a per-channel number can look precise and be quite wrong. Start blended, improve your inquiry records, and break it down once the records can support it.
What to compare it with
On its own, acquisition cost is neither good nor bad. It becomes meaningful next to two other numbers:
- Customer lifetime value, measured in gross margin. If a customer is worth several times what it costs to win them, growth is profitable.
- Payback period: the months of margin needed to recover the cost. This tells you how much growth your cash flow can fund.
Measuring results is the fourth area of a growth system, and acquisition cost is its most important single figure. In every engagement, it is the first number we reconstruct from the client's own books, with the calculation shown, before any estimate or projection appears. You can read more on How we work.
Want the real number, from your own books?
A short call is enough to tell whether your records can produce it, and how far it is likely to be from what your reports show.
Request an introductory callCommon questions
What is the difference between cost per lead and customer acquisition cost?
Cost per lead divides spend by the number of inquiries. Customer acquisition cost divides the full cost of winning business by the number of customers who actually paid. Because only some leads become customers, and because spend is usually more than media alone, acquisition cost is typically many times higher than cost per lead.
Should salaries be included in customer acquisition cost?
Include the share of salaries spent on winning new business: marketing staff, and the portion of sales and leadership time spent on prospects rather than existing clients. Leaving people out makes the cost look lower than it is, and makes channels that rely on staff time look cheaper than paid ones.
How often should we calculate it?
Quarterly, over a rolling twelve months. A single month is too short for most service businesses, because the spend in one month often produces customers in the next.
What is a good customer acquisition cost?
There is no universal figure. Acquisition cost is good or bad only in relation to what a customer is worth. Compare it with lifetime value in gross margin, and with how many months it takes to earn the cost back.