How to calculate the true cost of winning a new client for your consulting firm

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 a consulting practice, step by step, with the inputs that actually apply to your business.

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How to apply the standard CAC formula to consulting firms

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 consulting firm CAC fundamentally different.

First, founder-led sales. Most consulting firms under $5M don’t have a dedicated sales team. The founding partner or managing director is the rainmaker. Their time (on prospect meetings, proposal development, conference speaking, thought leadership, networking) is 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 conversation at an industry conference might lead to an exploratory call three months later. A client you delivered a project for two years ago might resurface with a new engagement. 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. Senior consultants join scoping calls to assess the work. Analysts build supporting research, case studies, and diagnostic frameworks for proposals. Associates prepare engagement plans and methodology decks. 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.

There is a fourth difference, and it matters most: margin.

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 a consulting example, A practice might keep, say, 50-65% of revenue after paying the people and costs to deliver the work (known as gross profit margin, or GPM) on a good day. That means 35-50 cents of every revenue dollar goes straight to delivery costs: consultant salaries, subcontractors, research tools, travel expenses, and engagement-specific software. An engagement worth $200,000 in fees generates $100,000-$130,000 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 consulting firm CAC formula

Here’s the formula, built for how consulting firms actually win engagements:

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

Partner/founder business development time. In firms under $5M this is often the largest part of total CAC. It includes every hour the founding partner spends on activities that exist to win new work: prospect meetings, proposal development, conference speaking, thought leadership writing, networking at industry events, referral source maintenance, free diagnostic conversations, and scoping calls.

Direct sales and marketing spend. Everything you pay for that exists to bring in new business. Website hosting and maintenance, CRM or pipeline tracking tools, industry conference attendance, professional association memberships, thought leadership content production, PR or communications support, speaking engagement travel, and any outsourced content or design work for proposals. If you hire a business development coordinator or outsource proposal formatting, those costs go here.

Team time on proposals. Billable team members doing unbillable work. Senior consultants joining scoping calls with prospects. Analysts building case studies, research summaries, or diagnostic frameworks for proposals. Associates preparing engagement plans, methodology decks, and budget breakdowns. Calculate their cost the same way you’d calculate founder time: hourly rate times hours spent.

Step-by-step calculation

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

Step 1: Calculate your partner business development cost.

Find your hourly rate. Total annual remuneration (salary, super and other on-costs, meaning what you actually cost the firm) divided by the hours you actually work in a year. This example uses 1,920 (48 weeks of 40 hours, allowing for leave and public holidays); use your own hours if they differ, such as 1,824 for a 38-hour week.

Estimate your weekly BD hours. Be honest. Include prospect meetings, proposal development, conference attendance, thought leadership writing, networking events, referral source lunches, free diagnostic sessions, and scoping calls. If you’re not sure, track it for one week. Many founding partners are surprised by how high it is.

Multiply. Weekly hours x hourly rate x the weeks you actually work (the same 48 weeks used for the hourly rate) = annual founder sales cost.

Example: $200K total remuneration / 1,920 = $104.17/hour. 15 hours/week x $104.17 x 48 weeks = $75,000/year in partner time on business development.

That’s $75K in acquisition cost before a single dollar of marketing spend. This is the number that shocks most consulting firm founders. You can’t see it on your P&L, but it’s real: every hour you spend developing business is an hour you’re not spending on billable client work, 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 firms 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. Senior consultants joining scoping calls. Analysts building research and case studies for proposals. Associates preparing engagement plans and pricing. Other partners or principals presenting at the pitch meeting.

Calculate their hourly cost the same way: salary plus super and on-costs divided by the same annual hours. 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 $65/hour. That’s 192 hours x $65 = $12,480/year.

This number is often smaller than founder time, but it adds up, especially if your firm develops detailed proposals with custom diagnostic frameworks. If your team spends 40 hours developing a proposal that doesn’t convert, that’s $2,600 in delivery capacity you didn’t bill for.

Step 4: Add it all up and divide.

The consulting firm CAC worksheet

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

Step 1: Partner BD time 15 hrs/week x $104.17/hr x 48 weeks

$75,000

+

Step 2: Direct sales and marketing spend Conferences, memberships, website, thought leadership, CRM

$25,000

+

Step 3: Team proposal time 2 team members x 8 hrs/mo x $65/hr x 12 months

$12,480

Total annual acquisition cost

$112,480

Divided by 10 new clients won that year

Your real CAC per client

$11,248

Partner time = 67% of the total. The cost your P&L never shows you.

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

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 consulting firms that means calculating the value with gross profit, not fee revenue.

Consulting firm LTV formula: Average fees per engagement x engagements per client x GPM = lifetime value.

A client who engages your firm for three projects averaging $120K in fees, at 60% GPM: $120,000 x 3 x 0.60 = $216,000 LTV. Against an $11,248 CAC, that’s a 19.2:1 ratio. Excellent.

A one-off engagement at $80K in fees at 45% GPM: $80,000 x 1 x 0.45 = $36,000 LTV. Against $11,248 CAC, that’s 3.2:1. Tight, and it highlights why expanding client relationships into ongoing advisory or follow-on engagements is so important.

At 60% GPM

$216,000 LTV

$120K x 3 engagements x 60%

19.2:1 ratio: excellent

At 45% GPM

$36,000 LTV

$80K x 1 engagement x 45%

3.2:1 ratio: tight, and below the 50-65% GPM band

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

Here are illustrative ranges by firm size:

Firm 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 starting ranges, not published industry benchmarks. 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 consulting firms, 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; 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. Get your free financial health check to see where you sit.

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, media 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 firms 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 consulting firm 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 firm 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 consulting firm’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 (senior consultants, analysts and associates 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. It’s often the largest component for firms under $5M (about two-thirds in the worked example above). Calculate your hourly rate (total remuneration divided by the hours you actually work in a year), estimate weekly hours on sales activities, and multiply across the year. A founder earning $200K who spends 15 hours per week 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 consulting firm?

As an illustrative guide, ranges vary by size: $1K-$5K for firms 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 consulting firms LTV must be calculated using gross profit (revenue x GPM), not raw revenue, because your delivery costs are often 35-50% of revenue. Target an LTV:CAC ratio of 5:1 or higher. Get your free financial health check to see where your numbers sit.

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.