Marketing Break-Even Calculator
What a new customer costs, what one is worth, and what spend your margins carry.
Cost to win a customer
Your monthly spend divided by the customers it brings in
One sale leaves you
The first sale does not cover the cost — the customer pays you back over the visits that follow
Payback
Months of normal purchasing before a new customer has paid back what they cost
Twelve-month value
The margin one customer leaves in a year, at the frequency you entered
The ceiling
The most a customer can cost before a year's margin stops covering it. Right now you are paying $75 against that $198 — a 2.6× return on the spend.
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How it decides
Customer acquisition cost is your marketing spend divided by the new customers it brings in over the same stretch. Spend $1,500 a month and win 20 first-timers, and each one cost you $75 — before they have bought anything. Whether $75 is fine or alarming depends on one comparison that belongs to your business rather than to an industry average, and that is what a customer leaves behind in margin over the year that follows.
That comparison produces the ceiling. A $60 average sale at a 55 percent margin, six visits a year, leaves $198 — so a customer can cost up to $198 before a year of their business stops covering the spend that won them. Everything under the ceiling is a question of how fast the payback needs to arrive; everything over it is a loss no volume fixes. The margin field is doing the heavy lifting here, and if you sell through more than one channel it is worth splitting — the channel margin calculator prices each one.
It cannot tell you whether the ads are any good — the tool prices the outcome you report, and if the customers-per-month field is a guess, every number downstream is that guess worked through, labeled plainly as one. It also treats every customer as average. One channel bringing in $30 one-timers and another bringing $200 regulars will read as one bland middle; if you can split the spend and the arrivals, run them separately.
And the twelve-month value leans on the frequency you entered. A customer who never comes back is worth one sale, whatever the average says — retention is the quiet variable this whole page stands on, and no acquisition math improves a business people do not return to.
The spend question, asked properly
“How much should a small business spend on marketing” usually gets answered with a percent of revenue, and the percent was never about you. Rules like that were written for companies with marketing departments to staff and agencies to retain — a cost structure built to somebody else’s specification, rational for them, carried into your planning by a search result. Ad platforms price by auction against every bidder in your market, which is also rational for them; none of it knows your margins.
The defensible answer comes out of your own unit economics, and it is the ceiling above. Spend anything you like below the number a year of customer margin pays back, provided the cash lasts until the payback month arrives. If the calculator says the math works and the bank balance says the timing does not, that gap is a planning problem with known moves, and worth a conversation.
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The assessment is free. I pull your public data and show you what I see, and your numbers stay yours.