How to calculate customer acquisition cost for your agency

Search “how to calculate customer acquisition cost” and you’ll find dozens of guides. They’ll all give you the same formula: total sales and marketing spend divided by number of new customers. The important question is whether your inputs include the full cost of winning the work.

The standard formula works for a services firm too, provided its inputs include all the work involved in winning clients.

This guide walks through exactly how to calculate your real CAC as an agency, step by step, with the inputs that actually apply to your business.

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How to apply the standard CAC formula to agencies

The standard CAC formula is total acquisition sales and marketing costs divided by new customers acquired. It can include salaries and other acquisition labour in any sector. For services firms, the challenge is identifying time spent on proposals and relationships as well as direct marketing spend.

Three things make agency CAC fundamentally different.

First, founder-led sales. Most agencies under $5M don’t have a sales team. The founder is the sales function. Their time (on calls, proposals, networking, pitches) is often the single largest acquisition cost. But it never shows up as “sales spend” in the P&L because the founder doesn’t invoice themselves.

Second, long relationship-based sales cycles. A referral conversation at a dinner in January might become a signed proposal in June. There’s no clean “campaign spend” to attribute. The costs are diffused across months of relationship building, follow-ups, and conversations that don’t have a line item.

Third, team involvement in pitches. Designers mock up spec work. Strategists join chemistry meetings. Project managers scope proposals. These are billable people doing unbillable work, a real acquisition cost. Standard CAC can include this labour; the practical task is to allocate it consistently. Include founder and team acquisition time, avoid counting salaries twice, and align the cost period with the clients or projects won.

But there’s a fourth difference that matters even more.

Use gross profit consistently when comparing lifetime value with acquisition cost. Revenue and gross profit differ in software as well as services. A client paying $1,000 a month for three years generates $36,000 lifetime revenue. At an illustrative 80% gross margin, that is $28,800 lifetime gross profit, before acquisition costs, overhead and tax. Apply the actual gross margin rather than assuming almost all revenue is profit.

For an agency example, Even a well-run professional services firm might run at 50–60% GPM. That means 40–50 cents of every revenue dollar goes straight to delivery costs: billable salaries, contractors, delivery software, pass-throughs. A client paying $5,000/month for 3 years generates $180,000 in revenue but only $90,000–$108,000 in gross profit. That’s your real LTV, not the revenue number.

A benchmark is useful only when its definitions match yours. On a gross-profit basis, a 3:1 LTV:CAC ratio means acquisition absorbs one-third of lifetime gross profit in any sector. We use 5:1 as a planning rule of thumb, not an industry requirement or a guarantee of healthy economics. Also consider payback time, retention uncertainty, overhead and cash needs.

The agency CAC formula

Here’s the formula, built for how agencies actually win clients:

Three cost categories. One number. Let’s walk through each.

Founder/partner sales time. For agencies under $5M this is often the largest share of total CAC (about two-thirds in the worked example below). It includes every hour the founder spends on activities that exist to win new business: discovery calls, proposal writing, networking, follow-ups, conference attendance, LinkedIn content, pitch meetings, referral conversations.

Direct sales and marketing spend. Everything you pay for that exists to bring in new business. Paid advertising (Google Ads, LinkedIn Ads, Meta/Facebook, PPC, sponsored content), tools (CRM, proposal software, email marketing, SEO tools), website hosting and maintenance, event sponsorships, conference attendance, content creation (if outsourced), photography, video production, case study creation, and collateral. If you pay a writer or agency to produce blog content for lead generation, it goes here. If the founder writes it, that time goes in the founder bucket.

Team time on pitches. Billable team members doing unbillable work. Designers creating spec mockups, strategists sitting in chemistry meetings, project managers scoping proposals, account directors on pitch teams. Calculate their cost the same way you’d calculate founder time: hourly cost times hours spent.

Step-by-step calculation

Here’s the full walkthrough using a $2M agency as the example. Follow along with your own numbers.

Step 1: Calculate your founder sales cost.

Find your hourly cost. Total annual compensation (salary, super and other benefits: what you actually cost the business) divided by the hours you actually work in a year. Use the same number of weeks here as in the next step, so leave out holidays. At 40 hours a week for 48 weeks, that’s 1,920 hours.

Estimate your weekly sales hours. Be honest. Include discovery calls, proposal writing, networking coffees, follow-up emails, LinkedIn content, conference attendance, pitch preparation, referral conversations. If you’re not sure, track it for one week. Many founders are surprised how high the number is.

Multiply. Weekly hours x hourly cost x 48 working weeks = annual founder sales cost. (A shortcut that gives the same answer: your total cost x sales hours ÷ total hours worked each week.)

Example: $200K total cost / 1,920 hours = about $104/hour. 15 hours/week x $104.17 x 48 weeks = $75,000/year in founder time on sales (the same as 15 of 40 hours, or 37.5%, of $200K).

That’s $75K in acquisition cost before a single dollar of marketing spend. This is the number that surprises many agency founders. You can’t see it as a sales line on your P&L, but it’s real: every hour you spend selling is an hour you’re not doing something else, and your compensation doesn’t change based on how you spend your time.

Step 2: Add your direct sales and marketing spend.

Pull these from your P&L or accounting software for the same 12-month period:

• Paid advertising: Google Ads, LinkedIn Ads, Meta/Facebook, PPC, sponsored posts, any paid media
• Tools and subscriptions: CRM (HubSpot, Salesforce, etc.), proposal software, email marketing platforms, SEO tools, LinkedIn Premium
• Content and creative: Freelance writers, video production, photography, case study design: anything produced to attract or convert prospects
• Website: Hosting, maintenance, redesigns done to support lead generation
• Events: Conference tickets, sponsorships, speaking engagement travel, networking event costs, industry association memberships
• Collateral: Pitch decks, capability statements, portfolio materials created to win new work

Example: $25,000/year across all categories.

Most agencies undercount this because the expenses are scattered across different P&L categories. A $500/month CRM subscription doesn’t feel like “acquisition spend” until you realise it exists entirely to manage your pipeline.

Step 3: Estimate team time on pitches and proposals.

Identify everyone beyond the founder who participates in business development. Designers creating spec work or pitch visuals. Strategists joining chemistry meetings. Project managers scoping and pricing proposals. Account managers on trial calls with prospects.

Calculate their hourly cost the same way: salary plus super and other benefits divided by the hours they actually work in a year. Estimate monthly hours each person spends on new business activities. Multiply by 12.

Example: Two team members averaging 8 hours/month each on business development. Their blended hourly cost is $55/hour. That’s 192 hours x $55 = $10,560/year.

This number is often smaller than founder time, but it adds up, especially if your agency does spec work or detailed custom proposals for every pitch. If your team spends 20 hours preparing a proposal that doesn’t convert, that’s $1,100 in delivery capacity you didn’t bill for.

Step 4: Add it all up and divide.

The agency CAC worksheet

A $2M agency example: follow along with your own numbers

Step 1: Founder sales time 15 hrs/week x $104.17/hr x 48 weeks

$75,000

+

Step 2: Direct sales & marketing spend CRM, ads, website, events, content, tools

$25,000

+

Step 3: Team pitch time 2 team members x 8 hrs/mo x $55/hr x 12 months

$10,560

Total annual acquisition cost

$110,560

Divided by 10 new clients won that year

Your real CAC per client

$11,056

Founder time = 68% of the total. The cost your P&L never shows you as a sales line.

Not “basically zero”. In this example, founder time is roughly two-thirds of the total. Include that time in acquisition costs even if it is not tracked in a separate sales account.

One timing point: the money and hours you spend this year often win clients who sign next year, and vice versa. Use a rolling 12 months, keep the same window for costs and clients, and if your sales cycle is long, compare costs with clients won a few months later. For LTV, follow each year’s intake of new clients (a cohort) to see how long they actually stay, rather than guessing.

Now make it useful: CAC by channel

Your overall CAC is the starting point. The real value comes from breaking it down by how clients actually found you.

For each channel, estimate the costs specific to that channel and divide by clients won through it:

Referrals. Founder time on referral conversations and relationship maintenance, divided by clients won via referral. This is usually your lowest-cost channel, but it’s not zero. If you spent 5 hours of founder time per referral client on calls, meetings, and proposals, that’s roughly $520 per client in founder time alone. Add a portion of your CRM and tools cost.

Inbound (content and SEO). Content creation costs plus SEO tools plus a share of website spend, divided by clients won through inbound. Higher upfront investment, but the cost per client typically decreases over time as content compounds.

Outbound (ads and cold outreach). Ad spend plus outreach tools plus time on outbound activities, divided by clients won through outbound. Usually the highest cost per client, but potentially the most scalable and the least dependent on the founder’s personal network.

Events and networking. Conference costs plus sponsorships plus founder time at events, divided by clients won from those events. Often the hardest channel to attribute, but worth estimating.

When you see CAC by channel, you can answer a question most founders guess at: where should I invest my next growth dollar? The answer isn’t always “the lowest CAC channel”. It’s the channel with the best LTV:CAC ratio, because some channels produce clients who stay longer, expand scope, and generate more lifetime gross profit than others.

What your CAC number actually means

Your CAC alone doesn’t tell you if it’s good or bad. You need to compare it to what each client is worth, and for agencies, that means calculating LTV with gross profit, not revenue.

Agency LTV formula: Average monthly revenue per client x average client lifespan in months x GPM = lifetime value.

A client paying $5K/month who stays 4 years at 55% GPM: $5,000 x 48 x 0.55 = $132,000 LTV. Against an $11,000 CAC, that’s a 12:1 ratio. Excellent.

The same client at 35% GPM: $5,000 x 48 x 0.35 = $84,000 LTV. Against $11,000 CAC, that’s about 7.6:1. Still healthy, but the margin difference just cut 36% off the ratio, without changing anything about acquisition.

At 55% GPM

$132,000 LTV

$5K/mo x 48 months x 55%

12:1 ratio: excellent

At 35% GPM

$84,000 LTV

$5K/mo x 48 months x 35%

7.6:1 ratio: still healthy

This is why GPM matters so much. Improving your delivery margins doesn’t just improve profit month to month; it fundamentally improves your growth economics by increasing LTV on every client you’ve already won.

Here are the rough ranges we use as a starting point at each stage:

Agency size	CAC range	LTV range	Target LTV:CAC
$500K-$1.5M	$1K-$5K	$35K-$100K	5:1+
$1.5M-$5M	$5K-$15K	$100K-$400K	5:1+
$5M-$10M	$10K-$25K	$250K-$750K+	5:1+

These are illustrative rules of thumb, not survey data. Your numbers will vary based on service mix, pricing model, and client type. Use them as directional guideposts, not rigid targets.

What your LTV:CAC ratio is telling you

For agencies, LTV = gross profit, not revenue. Match the benchmark definition.

• <3:1 Danger

  Growth is too expensive. Your acquisition cost is eating too much of the gross profit from each client. Reduce CAC or improve retention and margins before scaling.

• 3-5:1 Tight

  Viable but not much room for error. Focus on increasing client lifespan and improving GPM to push the ratio higher before investing heavily in acquisition.

• 5-8:1 Healthy

  Strong growth economics. Your acquisition costs are well-supported by client value. Safe to invest in scaling acquisition channels.

• 8:1+ Strong

  Excellent economics. You may be underinvesting in growth, so consider increasing acquisition spend to capture more market share while the ratio supports it.

Below 3:1 means growth is too expensive: you need to either reduce CAC or improve retention and margins to push LTV up. Between 3:1 and 5:1 is workable but tight. Above 5:1 means your growth economics are healthy and you can invest more confidently in scaling. To see where your wider numbers sit, get your free financial health check.

What to do Monday morning

Track your time for one week. Keep a rough log on your phone. How many hours did you spend on activities that exist solely to win new business? Multiply by your hourly rate. That’s your weekly founder CAC contribution, and it’s probably the number that surprises you most.

Pull your P&L and tag every sales and marketing expense. CRM subscriptions, ad spend, event tickets, content costs, proposal software. Add it up for the last 12 months. Most founders haven’t seen this number as a single total before.

Count your new clients from the past 12 months. Divide your total acquisition costs by that number. Write it down. That’s your CAC, and now every growth decision you make has a baseline to measure against.

The agencies that grow efficiently aren’t the ones that spend the most on acquisition. They’re the ones that know exactly what they spend, know what each client is worth, and can see whether the ratio between those two numbers supports the growth they’re planning.

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The reason most agency founders have never calculated their CAC isn’t that the maths is hard. It’s that nobody has shown them the version of the maths that applies to their business. Start with the standard formula and allocate the costs of your own acquisition process.

Your agency wins clients through relationships, referrals, proposals, and founder hustle. The costs are real; they just don’t look like a SaaS acquisition budget. And because your margins are tighter, every dollar of CAC matters more. Once you see the numbers clearly, every growth decision gets sharper.

Frequently asked questions

What costs should I include in my agency’s CAC?

Three categories: founder and partner time on sales activities (calls, proposals, networking, pitches), direct sales and marketing spend (advertising, CRM, tools, events, content, website), and team time on pitches and proposals (designers, strategists, and PMs doing unbillable business development work). The test for whether something belongs: would this cost exist if you weren’t trying to win new business? If no, it’s an acquisition cost. Delivery costs like client onboarding belong in your GPM calculation, not your CAC.

Should I include founder time in CAC?

Yes. For agencies under $5M it’s often the largest component. Calculate your hourly cost (total cost to the business divided by the hours you actually work in a year), estimate weekly hours on sales activities, and multiply across the same working weeks. A founder costing $200K who works 40 hours a week and spends 15 of them on sales is contributing roughly $75K per year in acquisition cost. Excluding this makes your CAC look artificially low and leads to underpricing and growth decisions that don’t reflect reality.

What is a good CAC for my size of agency?

As a rough starting point (rules of thumb, not survey data): $1K–$5K for agencies at $500K–$1.5M revenue, $5K–$15K for $1.5M–$5M, and $10K–$25K for $5M–$10M. But the number by itself doesn’t tell the full story. What matters is your LTV:CAC ratio, and for agencies, LTV must be calculated using gross profit (revenue x GPM), not raw revenue, because your delivery costs may be 40–50% of revenue or more. Aim for an LTV:CAC ratio of 5:1 or higher. To see where your wider numbers sit, get your free financial health check.

How often should I calculate CAC?

At minimum, quarterly. But the most useful habit is tracking founder sales time weekly, even rough estimates in a note on your phone. Weekly time tracking gives you real-time visibility into your biggest cost category. Then quarterly, pull your full P&L, add direct spend and team pitch time, divide by clients won, and update the number. Over time you’ll see trends: is CAC rising or falling? Which channels are getting more or less efficient? These trends matter more than any single calculation.