You have three answers: whether anyone is looking for what you sell, what you can afford to pay, and how much work you can actually perform. Here we turn those into a decision — and the decision has exactly three possible shapes.
It takes two calculations. Not a model, not a forecast. Two.
Point A and Point B
Point A is your business today. Today’s volume, today’s margin, today’s close rate. Run the chain — average job × margin = max per customer, × close rate = max per lead, × site conversion = max per click — on the numbers as they currently are. That gives you today’s maximum: what you can afford per customer, per lead, per click, this month, at this level of activity.
Point B is the same business, fully booked. Same prices, same crew, same conversion rates. The only thing that changes is that the work is at capacity.
Point B is almost always better, and the reason is fixed costs. At Point B the same rent, insurance, truck payments and software are spread across far more work, so a larger share of every job is margin. Same business, better arithmetic, purely because it’s busier.
Now compare each of them against what the market charges.
Three outcomes
One: it works at Point A
Your maximum today is comfortably above the market price.
Advertise. That’s the whole answer. The gap between what you can pay and what a click costs is your room to work on every customer you buy, and the job of the advertising is to walk you from A toward B — where the economics get better still.
This is the least common outcome, and if it’s yours, the risk facing you isn’t the one you’ve been worrying about. It’s growing past what you can deliver. Watch the ceiling, not the floor.
Two: it doesn’t work at A, but it works at B
This is the most common outcome by a distance, and it’s the one that gets misread as no by people who only ran one calculation.
Your economics don’t close at today’s volume. At full capacity they close comfortably. Somewhere between those two points is the volume where they start working.
That volume is your target. Not “more leads.” A specific number of jobs per month, with a reason attached, and every decision about budget, channel and bid follows from it.
Say it precisely, because saying it precisely is what makes it useful:
At my current volume I lose money on paid customers. From about thirty jobs a month, I make money. So I need to reach thirty jobs a month, and I know what I can pay to get there.
That is a plan. Compare it to what the same owner would otherwise say — we want to grow — and you can see why one of them survives contact with a bad month and the other doesn’t.
Two conditions before you go, though.
Is there enough demand? If the whole channel can’t produce thirty jobs a month at any bid, the target is fictional. Go back and count the demand.
Can you perform thirty jobs? If your crews top out at sixteen, you cannot reach the volume your economics require. That’s not this outcome. That’s the next one.
Three: it doesn’t work at B either
Full capacity, every job you can physically do, fixed costs completely absorbed — and your maximum is still at or below what the market charges for a click.
This is a no.
Not “spend less.” Not “try another platform.” Not “find a better agency.” There is no budget, no channel and no operator that makes this work, because you have just calculated the best version of your business as it currently exists and it still can’t afford customers at market price.
Worth being blunt here, because this is the moment most people get talked out of.
Roughly four out of five businesses that come to us don’t get a straight yes. They land in this outcome and the previous one together. Most of those are not yet: fix the thing dragging your maximum down, then come back. A hard no — nothing works at any volume — is the smaller share. But it exists, and we have delivered it.
And in almost every case the temptation is to try anyway, because the campaign can always be launched, someone will always agree to launch it, and the failure takes months to become undeniable. What that costs is the money, the year, and the belief that the channel works at all.
The correct move is to close the spreadsheet and go change something real. You already know what: the chain shows you which conversion step is dragging your maximum down, and the order of repair goes through the fixes in sequence. Then come back and run the two points again.
Nobody has ever regretted the version of this where they found out in January.
Which limit is binding?
When the answer is no — or when it’s yes but tight — one more question is worth thirty seconds, because it tells you what to work on.
You have two maximums. The economic one: what you can afford to pay. The production one: what you can deliver. The lower one governs, and they call for opposite responses.
If economics bind — you have idle crews and can’t afford to buy them work — the fixes are pricing, margin, close rate and website conversion. Advertising more is exactly wrong; you’d be buying loss at scale.
If production binds — your numbers are healthy but you can’t take on more — you don’t have a marketing problem at all. You have a hiring problem, or a scheduling problem, or a phone nobody answers. Fix that and the same advertising budget produces more revenue without any change to the ad account.
The failure worth naming is treating one as the other. A business with idle crews and broken economics that spends more on ads accelerates its own losses. A business with sound economics and a booked-out crew that also spends more buys reviews it doesn’t want. Both look like “we invested in marketing.” Both are the wrong lever pulled harder.
What this actually costs you to find out
An evening.
Twelve months of bank statements, a keyword tool, an honest conversation with whoever answers your phone, and the arithmetic. Our maximums calculator does the chain part in about two minutes — seven numbers in, three maximums out.
Compare that to the standard alternative: pick a budget, hire someone, run for a quarter, and read the answer off your bank balance. Same information, six months later, and paid for in cash and in your willingness to ever try again.
That’s the whole trade this method proposes. Not a clever tactic — just doing the arithmetic in the cheap place instead of the expensive one.
Win in the spreadsheet first. If it doesn’t work there, where you control every assumption and nothing costs anything, it will not start working when real money is moving and reality gets a vote.
What happens next
If you got a yes, the next thing to understand is that month one is a measurement, not a result — what the first four weeks are actually for, and what to do when the numbers come back different from your assumptions.
If you got a no, go to the order of repair first. It’s the one that turns this answer into a plan rather than a disappointment.
And either way, come back to these two calculations in a year. The market moves against you by default — click prices rise, competitors improve, and a business that stays exactly the same slowly loses the ability to afford its own customers. This test isn’t something you pass once.
This chapter is drawn from Win in the Spreadsheet First. The full arithmetic, the checklists, and the same treatment per trade are in the book.
Frequently asked questions
- How do I know whether advertising will work for my business?
- Run two calculations, not a model. Point A is your business as it is today — today's volume, today's margin, today's close rate — run through the chain from average job and margin down to what you can afford per click. Point B is the same business fully booked: same prices, same crew, same conversion rates, with fixed costs spread across far more work, so a larger share of every job is margin. Compare both against what the market actually charges for a click. Three outcomes follow, and which one you land in tells you what to do next. It costs an evening, twelve months of bank statements and a keyword tool.
- What if my numbers don't work today but would work at full capacity?
- That's the most common outcome by a distance, and the one that gets misread as no by people who only ran one calculation. Somewhere between the two points is the volume where the economics start working — find it and that volume becomes your target. Not 'more leads': a specific number of jobs per month with a reason attached, from which every decision about budget, channel and bid follows. Two conditions before you go: is there enough demand in the channel to produce that volume at any bid, and can your crews actually perform it? If your crews top out below the number your economics require, that's a different outcome.
- When should a business definitely not advertise?
- When it doesn't work at Point B either — full capacity, every job you can physically do, fixed costs completely absorbed, and your maximum is still at or below what the market charges for a click. That's a no. Not spend less, not try another platform, not find a better agency. There is no budget, no channel and no operator that makes it work, because you've just calculated the best version of your business as it currently exists and it still can't afford customers at market price. The correct move is to close the spreadsheet and change something real in the business, then run the two points again.
- Which limit should I be working on — economics or capacity?
- The lower one governs, and they call for opposite responses. If economics bind — idle crews you can't afford to buy work for — the fixes are pricing, margin, close rate and website conversion, and advertising more is exactly wrong because you'd be buying loss at scale. If production binds — healthy numbers but you can't take on more — you don't have a marketing problem at all. You have a hiring problem, a scheduling problem, or a phone nobody answers, and fixing it makes the same budget produce more revenue with no change to the ad account. Treating one as the other is the failure worth naming.
- How often should I redo this calculation?
- Once a year, minimum. The market moves against you by default: click prices rise, competitors improve, and a business that stays exactly the same slowly loses the ability to afford its own customers. A yes from March can be quietly wrong by the following March without anything going obviously wrong in between. The second run is faster and more accurate than the first, because by then you have real numbers instead of assumptions.