What is max CAC and how do I calculate mine?

Max CAC is the most you can afford to pay to acquire one customer and still hit your margin target. Start from gross profit per job (average ticket × gross margin), decide what share of that profit you're willing to spend on acquisition, and that ceiling is your max CAC — every channel gets judged against it, not against what feels expensive.

Why do impressions and SEO rankings matter less than unit economics?

Impressions and rankings describe visibility, not money. A campaign can generate huge impression volume and still lose money if cost per booked job exceeds what the job is worth. Unit economics is the filter that tells you whether visibility is actually profitable — rankings are an input, not the scoreboard.

What's the most common mistake businesses make with unit economics?

Scaling spend on a channel before confirming its cost per booked job is under max CAC. Volume without a margin check just multiplies the loss — the numbers need to work at small scale before they're worth scaling.

Insight May 1, 2026 · 3 min read Updated June 2026

Why Unit Economics is the North Star of Service Marketing

Practical marketing insight from Husky Digital.

Anton Khripko Founder and Growth Strategist

unit economicscost per booked jobcustomer acquisition costCACmax CAClifetime value

The Shift from Clicks to Profit

Most agencies report on ‘visibility’ and ‘impressions’. But for a service business, these are vanity metrics. What matters is the Cost per Booked Job.

For a service business, impressions are noise. Cost per booked job is the number that decides every budget call.

The one number under it all

Cost per booked job = ad spend ÷ booked jobs. Said the other way: your cost per lead divided by your close rate. A $50 lead at a 25% close rate is a $200 booked job. The same $50 lead at a 10% close rate is a $500 booked job — same ad, very different business.

Every channel runs through the same chain. A weak close rate or thin margin breaks the math long before the ad does.

Knowing your max CAC

Gross profit per job = average ticket × gross margin. Your max CAC is the slice of that profit you’re willing to spend to win the job and still come out ahead. Spend less than max CAC and the channel makes money; spend more and you’re buying jobs at a loss.

$600Average ticket (illustrative)

50%Gross margin → $300 profit/job

25%Close rate on leads

With the numbers above, a $50 lead becomes a $200 booked job and leaves $100 in profit — healthy. Push cost per lead to $90 and the booked job costs $360, more than the $300 it earns. The ad still “works” on the surface; the business quietly loses money on every job. That line only moves in your favor if LTV — repeat service, maintenance plans, referrals — pays back the gap over time.

Why it matters

Budget guardrails. Knowing your max CAC turns “is this expensive?” into a yes/no rule, not a gut feeling.
Channel stress testing. Some channels scale almost linearly (Google Ads, LSA — more budget, more leads up to a ceiling). Others saturate fast (one city’s Map pack). Unit economics tells you which channel can absorb the next $1,000 without blowing past max CAC.
Founder sanity. You finally see where every dollar goes — and you can say no to a channel before it drains the month.

The most common mistakes

Chasing CPL while close rate quietly drops — cheaper leads that book less are not cheaper jobs.
Counting revenue instead of gross profit — a $600 job at 20% margin is not the same as one at 50%.
Ignoring LTV for repeat-service trades (HVAC maintenance, recurring cleaning) — your real max CAC is higher than a single job.

This is the math we run before scaling any spend. If a channel can’t pay back, we say so — that’s the whole point of starting with economics instead of clicks.

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