How do you calculate the break-even point for a small business?
By BreakEvenLab · Published June 10, 2026 · Updated June 10, 2026
Divide your fixed costs by your contribution margin per unit — a business with $8,400 in monthly fixed costs selling at $6.25 with a $2.50 variable cost per unit keeps a $3.75 margin, so it breaks even at 2,240 units, or $14,000 in monthly sales.
The three numbers a break-even calculation needs
Before any formula, a small-business break-even analysis needs three inputs gathered from your own books. First, fixed costs for the period: the bills that arrive at the same size whether you sell one unit or a thousand — lease payments, insurance premiums, software subscriptions, loan payments, and salaried wages, including a realistic wage for the owner. Second, the selling price of one unit. Third, the variable cost of that same unit: ingredients or materials, packaging, payment processing, per-order shipping — anything that is only spent because a sale happened.
The quality of the answer depends on honest sorting. A common small-business error is leaving the owner's own pay out of fixed costs, which produces a flattering break-even point the business can "hit" while the person running it earns nothing. Another is treating a mixed cost as fully fixed: hourly help that scales with busy periods belongs partly in the variable bucket. When a cost genuinely straddles both, split it by estimate rather than forcing it whole into either column.
A worked example from start to finish
Picture a market stall selling a single product at $6.25 with $2.50 of variable cost per unit and $8,400 in monthly fixed costs. The contribution margin — what each sale leaves behind after paying for itself — is $6.25 minus $2.50, or $3.75 per unit, which is 60% of the price. Break-even units are fixed costs divided by that margin: 8,400 ÷ 3.75 = 2,240 units. Multiply by the price and the same answer in revenue terms is $14,000 of monthly sales.
Costs drift, so rerun the number when they do. If the supplier raises the per-unit cost to $2.80, the margin narrows to $3.45 — 55.2% of price — and the raw division becomes 8,400 ÷ 3.45 = 2,434.78. Since a partial unit cannot be sold, the calculator rounds up to 2,435 units, which is $15,218.75 of revenue. A thirty-cent cost increase quietly added almost two hundred units to the monthly target; break-even math is most useful precisely because it converts small cost changes into concrete sales targets.
From breaking even to an actual profit target
Breaking even pays the bills and nothing else, so the more useful planning question adds a profit goal to the numerator: units = (fixed costs + target profit) ÷ contribution margin. For the same stall, a $4,500 monthly profit goal needs (8,400 + 4,500) ÷ 3.75 = 3,440 units, or $21,500 in monthly sales — roughly 54% more volume than break-even.
Translating that into time makes it testable: 3,440 units a month is about 115 sales per day over thirty days. If the location, staffing, and equipment can plausibly produce that, the plan stands; if not, the profit target needs a different price, a cheaper unit, or lower overhead before it can be real. Running the target-profit form first is the difference between a hopeful budget and a checkable one.
No single product? Use the sales-dollars form
Many small businesses — cafés, retail shops, service firms with varied jobs — have no single unit to count, and the per-unit formula has nothing to divide. The same logic still works one level up: break-even revenue = fixed costs ÷ contribution margin ratio, where the ratio is the blended share of each sales dollar left after variable costs, computed from a recent profit-and-loss statement.
A shop carrying $15,000 in monthly fixed costs whose books show a 45% blended contribution margin ratio breaks even at 15,000 ÷ 0.45 = $33,333.33 in monthly sales. Because the ratio blends everything sold, it shifts when the product mix shifts — a month heavy on low-margin items needs more revenue to break even than the same month selling premium items, so recompute the ratio from fresh numbers rather than reusing last year's.
What the formula deliberately ignores
Break-even analysis is a planning estimate, and three omissions are worth naming before relying on it. It is blind to cash timing: invoices booked as revenue but not yet collected can leave a "profitable" month without money in the account. It assumes fixed costs stay flat, but in practice they step upward — enough volume eventually demands more space, equipment, or staff, which moves the break-even point that was just calculated. And it ignores seasonality: a single annual break-even number can hide months that run deeply underwater offset by a strong quarter.
None of this makes the calculation less worth doing — it makes the result a floor rather than a forecast. Use the break-even number to test whether a price and cost structure can work at all, the target-profit form to size what success requires, and your own cash flow and seasonal pattern to judge when. For decisions with real money attached, treat these figures as a starting estimate and confirm the plan with an accountant or advisor, not as a guarantee.
Questions
- What is the break-even formula for a small business?
- Break-even units = fixed costs ÷ (price per unit − variable cost per unit). With $8,400 of fixed costs, a $6.25 price, and a $2.50 variable cost, that is 8,400 ÷ 3.75 = 2,240 units, or $14,000 in sales.
- Should I include my own salary in fixed costs?
- Yes — a realistic owner wage belongs in fixed costs. Leaving it out produces a break-even point the business can reach while paying you nothing, which understates what the business actually has to sell to be viable.
- How do I find break-even without a single product price?
- Use the sales-dollars form: fixed costs ÷ blended contribution margin ratio from your P&L. At $15,000 in fixed costs and a 45% ratio, break-even is $33,333.33 in monthly revenue.
- Is the break-even result business advice?
- No. It is arithmetic on the numbers you enter — a planning estimate that ignores cash timing, cost steps, seasonality, and taxes. Confirm significant decisions with an accountant or qualified advisor.