Break-even point: how much you need to sell to not lose money

"We sold well this month" says very little if you don't know how much you needed to sell just to avoid losing money. Many small business owners look at monthly sales and feel relieved (or worried) purely by instinct, without a clear reference number. That number exists, and it's called the break-even point: the sales level where you neither gain nor lose.

Below that point, every month is costing you money even if there's movement in your cash flow. Above it, you start generating real profit. Without that number, it's hard to know which side of the line you're standing on.

What the break-even point is, in plain terms

It's the point where what comes in from sales exactly covers what goes out in costs: fixed costs (the ones you pay whether you sell or not, like rent, admin payroll, or software) and variable costs (the ones that depend on how much you sell, like raw materials, packaging, or commissions).

Selling below that point means that, even with revenue coming in, it's not enough to cover everything the business spends to operate. Selling above it is what starts leaving real profit.

The three numbers you need

You don't need a complex financial model, just three clear figures:

• Monthly fixed costs: everything you pay regardless of how much you sell.
• Variable cost per sale: how much it costs you to produce or deliver what you sell (as a percentage of price, or in currency per unit).
• Average sale price: what you typically charge for what you sell.

With those, a simple way to estimate it is:

Break-even sales = Fixed costs ÷ (1 − Variable cost / Sale price)

An illustrative example

Imagine a business with monthly fixed costs of $8,000,000 (this is just an example, not a real figure). Its variable costs represent, on average, 40% of each sale (raw materials, packaging, commission).

Break-even point = 8,000,000 ÷ (1 − 0.40) = 8,000,000 ÷ 0.60 ≈ $13,300,000

That means this business needs to sell around $13.3 million a month just to cover all its costs. Any sales below that figure mean a loss; above it, profit begins. If the owner only sees that "$10 million came in this month" without comparing it to this number, they might think it was a good month when in reality it fell short of what was needed.

Why almost no one calculates it (and it costs them)

It's not a matter of ability, it's a matter of habit:

• They mix fixed and variable costs without separating them, so there's no clean way to run the calculation.
• They calculate it once, when opening the business, and never revisit it even after rent goes up, they hire someone, or they switch suppliers.
• They decide by feel ("it felt like a good month") instead of comparing against a reference number.

The break-even point isn't static: it rises if your fixed costs increase or your margin shrinks, and it falls if you become more efficient. That's why it's worth reviewing every time something structural changes in the business, not just once a year.

What to do with this number

Once you have it, it's useful for concrete decisions, not just for knowing it:

• Set realistic sales targets: instead of an arbitrary figure, your minimum monthly goal is your break-even point plus the margin you want to earn.
• Catch a weak month in time: if by mid-month you're well below the pace you need, you can react before it's too late (cut spending, push sales, follow up on collections).
• Evaluate changes with data: if you raise prices, switch suppliers, or hire someone new, you can immediately see how your break-even point moves, instead of finding out months later.

Calculating this by hand every time something changes is tedious, especially when fixed and variable costs are scattered across different spreadsheets or invoices. Keeping them organized in one place lets this number update itself, instead of being an exercise you do (or skip) once a year.

If you want to know at any moment how much you need to sell to avoid losing money, try Miscostosfijos free for 7 days: sign up here.