Target divided by price, rounded up. That is the whole first answer, and every article on this question spends a page defining monthly recurring revenue instead of giving it. The second answer is the one that decides things.
One honest edge in that arithmetic first, because it is the kind of case a calculator usually gets wrong. A ONE-TIME price has no answer here at all — there is no recurring revenue to divide — so the function returns nothing rather than a confident zero. A zero would be a wrong answer wearing the costume of a computed one, and it is the sort of thing a user will screenshot.
Now the part that makes the first number misleading. At 5000 a month you need 173 customers at 29, or 51 at 99. What makes the count feel useful is that it sounds achievable. That feeling is where the mistake lives.
Put support next to it. Take 15 minutes per customer per month — one short email, or a fraction of a call you are not taking — and the two numbers move in OPPOSITE directions. Every step down in price multiplies the customers, and every extra customer adds support you personally owe.
At 29 that is 173 customers and 10 hours a week of support before you have built or sold anything. At 49 it is 103 customers and 5.9 hours — a real share of the week, and survivable. The bands are calibrated to one person's week rather than a company's: past eight hours a week, support is not a cost of the business, it is the job.
So the answer to how many customers do I need is not a number. It is: at or above 49, about 103 of them. Below that the count stops being the binding constraint and your calendar becomes it.
Three levers, and they are not equal. Cut the minutes — support load is linear in them, so halving 15 halves every hour column and moves the floor down a price step; this is the only lever that helps at every price at once. Raise the price, which is the fastest single move and the one most solo founders refuse. Or lower the target, because 5000 is a choice rather than a law.
The last thing the division quietly hides, and it is the one that changes plans. You do not need 103 customers in TOTAL. You need 103 at the same time. It is a level to be held, not a finish line to be crossed.
At 5 percent monthly churn you lose one in twenty every month, so holding 103 means signing roughly 6 new customers a month before you have grown by a single seat. At 29 the same churn means replacing about 9 a month, on top of the 10 hours of support you already owe. That is why the cheap rows are worse than they look.
What the arithmetic does not know, stated because a calculator invites more confidence than it has earned: it assumes every customer costs the same, it ignores billing and refunds and the occasional bug that eats a Saturday, and it assumes the customers exist and can be reached — which is the question that actually kills most ideas and that no calculator can answer.
Both calculators, no signup: https://whittleos.com/guides/how-many-customers-do-i-need
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