Ad spend breakeven calculator

1. Enter your average job value and gross margin — advertising is bought with gross profit, never revenue.
2. Enter how many jobs an average customer eventually gives you. Repeat business is what lets you outbid competitors.
3. Enter the share of ad leads that become jobs. Be pessimistic: ad leads close worse than referrals.
4. Enter the share of clicks that become leads — your landing page conversion rate.
5. Enter the profit you want to keep per job, or set it to zero to see the pure breakeven.
6. Enter how many extra jobs a month you want, to get a budget figure.
7. Read your ceiling, and check whether the calculator says there is room to advertise at all.

Set the profit target to zero once. The gap between the breakeven ceiling and your target ceiling is your entire margin for error — if it is small, a bad month wipes out a good one.

To predict what advertising will return, you need to know your cost per click, your click-through rate, your landing page conversion and your close rate on ad traffic. Three of those four you cannot know until you have run the ads, and the fourth varies by keyword, hour and competitor behaviour.

So a calculator that forecasts a return is asking you to supply the answer and then handing it back multiplied. The output looks analytical and contains no information you did not already put in.

The ceiling is different. Given what a customer is worth to you and how your funnel converts, the maximum you can pay is arithmetic — certain, immediate, and directly usable. You can walk into an ad account with that number today and know when to stop bidding, which is a genuinely useful thing to have and something no article can give you.

If a customer gives you one job worth two hundred dollars of gross profit, your ceiling on a lead is two hundred multiplied by your close rate. If the same customer comes back three times, your ceiling triples.

That is why a boiler servicing company can outbid a one-off installer for exactly the same click, and why a business with a service interval, a maintenance plan or genuinely loyal customers has a structural advantage in paid advertising that no amount of clever targeting substitutes for.

It also means the most powerful thing you can do to improve your advertising is not in the ad account. It is anything that makes a customer come back: an annual reminder, a service plan, a follow-up call twelve months later. Those raise your ceiling permanently, on every click you will ever buy.

Be honest with the input, though. Counting three jobs per customer because a few of your favourites come back annually, when most never return, will produce a ceiling you cannot actually afford. Use the average across everyone, including the ones who vanished.

The affordable cost per click is the affordable cost per lead multiplied by the share of clicks that become leads. So if your page converts at four percent and a competitor's converts at eight, they can pay twice as much per click as you can for exactly the same visitor.

That competitor will win the auction, every time, on the same underlying economics. Not because they are cleverer at bidding — because their page works better and they can therefore afford more.

This inverts the instinct most people have when clicks look expensive, which is to lower the bid. Lowering the bid on a page that does not convert simply buys you less of the same problem. Fixing the page raises the ceiling and makes the expensive clicks affordable.

What moves a local service landing page: one obvious action above the fold, a phone number that dials on tap, the specific service named in the same words as the ad, proof a stranger can check, and a page that loads in under two seconds on mobile data. None of that is exotic and all of it is cheaper than more spend.

If a customer is worth eighty dollars of gross profit over their lifetime and you want to keep sixty of it, you have twenty dollars to acquire them with — and at a thirty percent close rate that is a six-dollar ceiling on a lead. In most competitive local markets that is below the cost of a single click.

That is not a failure of your advertising skill. It is the arithmetic telling you that paid search does not fit this business at its current economics, and the correct response is either to change the economics or to use channels that do not have a per-lead cost.

The free channels are genuinely strong for local businesses and are systematically underused because they are slow. A verified Google Business Profile with recent reviews, a findable website, and consistent details across directories will out-produce a small ad budget for many trades — and once they are working, the same traffic that was unaffordable becomes affordable, because your conversion rate has improved.

The order that works: fix the page, claim the profile, build the review habit, and only then buy traffic. Buying traffic first is the most common and most expensive sequencing error in small business marketing.

Every number in this calculator is an average, and averages are exactly what small businesses do not experience. A month with four leads and no jobs is entirely consistent with a thirty-five percent close rate — it is just a small sample behaving like a small sample.

The practical consequence is that people switch advertising off after three weeks, having concluded from six leads that it does not work. Sometimes it genuinely does not. Often the data was never capable of telling them either way.

A workable discipline: decide before you start how many leads you will buy before judging — thirty is a reasonable minimum — and budget for that number at your ceiling. If you cannot afford thirty leads, you cannot afford to find out whether this works, and that is worth knowing before you spend rather than after.

It is also worth expecting your real cost per lead to run above the modelled one at first. Early spend goes on searches that were never going to buy, and it takes weeks of negative keywords and adjustment before an account is spending only on intent. Budget for the learning, or do not start.