How much can my business afford to borrow?
The safest way to size financing is backwards: start from the payment your business can realistically carry, then see what that payment supports — instead of starting from the largest amount someone might offer.
Start with the cash that is actually available
The relevant number is not revenue, and it is not profit on paper. It is the money left each month after normal business expenses and your regular owner pay, but before any new financing payment. If that figure is rough, treat it as rough — a precise calculation on a guessed input produces false confidence, not accuracy.
Be honest about the seasonality of that number. If some months are much thinner than others, the thin months are the ones a fixed payment has to survive.
Translate the affordable payment into an amount
Once you know the monthly payment you could carry, the financing amount it supports depends on the total cost and the schedule. To take a purely hypothetical figure: the same $3,000 of monthly room supports very different amounts depending on whether repayment stretches over two years or five, and on how expensive the financing is.
This is why affordability cannot be answered with a single multiplier. It is a function of the payment, the term, and the cost — all three.
Leave margin on purpose
A payment that consumes everything available works only if nothing goes wrong. Revenue dips, equipment breaks, customers pay late. If the payment only fits in a good month, it does not fit.
Borrowing less is a legitimate outcome. So is waiting until the available-cash figure is stronger, or not borrowing for this need at all. The goal is a payment the business can carry in an ordinary bad month, not a perfect one.
What we cannot tell you
No calculator can tell you what your business should borrow, because that depends on what the financing is for and what it returns. And nothing here predicts what any provider would offer. What the arithmetic can do is show the burden of a specific payment on the cash flow you describe — which is the part of the question most offers leave unanswered.