Break-even analysis: how many sales until you turn a profit?
A practical walkthrough of fixed vs. variable costs and how to calculate your break-even point in units and revenue, with a simple example.
Most business owners ask the real question too late: “how many units do you need to sell this month before you start making money?” Rent goes out, payroll clears, the supplier invoice lands — and often the only way to tell whether the month was profitable is to wait for the books to close. There is a way to answer that question before the month even starts: break-even analysis. Separate fixed costs from variable costs and you can see exactly how many sales cover your expenses, and from which sale onward each extra unit leaves profit in your pocket.
This guide walks through fixed versus variable costs, what contribution margin means, how to calculate the break-even point in units and revenue, and how to use that number in pricing decisions, through one simple worked example. No accounting background is required; it is a method you can redo on paper, or in a single spreadsheet row, in a few minutes.
What counts as a fixed cost?
Fixed costs are the items you must pay even if you sell nothing that month. Rent, staff salaries, your accounting and CRM subscriptions, insurance, loan instalments, and the depreciation charge on your equipment all fall into this bucket. Whether you sell 10 units or 1,000, none of these line items change.
Fixed costs are inflexible in the short run: you cannot halve the rent because sales were slow, and a salaried hire is not paid in proportion to units sold. That is why the first step is listing every fixed cost for a month or period, one line at a time — a forgotten subscription or insurance premium can throw off the whole calculation.
- Rent and shared charges: your monthly rent and any building fees stay the same no matter how much you sell.
- Salaries: the fixed portion of staff pay, excluding sales-linked commission or bonuses, belongs here.
- Software subscriptions: CRM, accounting, email, and storage tools usually bill at a flat monthly rate.
- Insurance, loan instalments, and depreciation: these accrue whether or not you make a sale.
What counts as a variable cost?
Variable costs rise and fall with every unit you sell. For a candle workshop, that is wax, wicks, fragrance oil, and packaging; for an online store, it is product cost, shipping, and marketplace commission; for a service business, it is subcontractor fees or materials used on the job. Sell nothing, and these costs drop to zero.
To get variable cost right, think in per-unit terms: what does it directly cost to produce and deliver exactly one more sale? Shipping discounts, bulk-buying deals, or tiered commission rates can nudge this number from month to month; a reasonable average is close enough for most small businesses.
Contribution margin: where profit actually comes from
When you sell something, the revenue is not all profit — you first have to cover that unit's variable cost. What is left over is called the contribution margin, and it is exactly the amount available to cover your fixed costs and, beyond that, to generate real profit.
The formula is simple: Contribution margin = Selling price − Variable cost per unit. Say you sell a product for 150 TL, and its variable cost (materials, packaging, shipping) is 60 TL. Your unit contribution margin is 90 TL — that is what each sale contributes toward fixed costs. Divide contribution margin by price and you get the contribution margin ratio: 90 / 150 = 60%.
Calculating the break-even point: units and revenue
Break-even point in units
Formula: Break-even units = Total fixed costs / Unit contribution margin. If monthly fixed costs are, say, 27,000 TL: 27,000 / 90 = 300 units. Sell 300 units in a month and you have covered every fixed expense; from unit 301 onward, each sale is genuine profit.
Break-even point in revenue
Sometimes it is easier to think in revenue rather than units, especially once you sell more than one product. Formula: Break-even revenue = Total fixed costs / Contribution margin ratio. 27,000 / 60% = 45,000 TL. Check it: 300 units × 150 TL = 45,000 TL — the same answer, two different ways.
It matters that the price and cost figures you use here exclude VAT; otherwise your break-even point comes out too low or too high. If you are not sure how VAT is calculated, it is worth starting there first.
A worked example: a candle workshop
Let's make the numbers concrete — a purely illustrative case. Elif runs a two-person handmade-candle workshop. Her monthly fixed costs — rent, one part-time employee's wage, an accounting-software subscription, and equipment depreciation — add up to, say, 27,000 TL. She sells each candle for, say, 150 TL, and the wax, wick, fragrance, and packaging for one candle cost 60 TL.
That gives a unit contribution margin of 90 TL, a break-even point of 300 candles, and break-even revenue of 45,000 TL. Selling fewer than 300 candles a month means a loss; every candle past 300 is net profit. The same formula can carry a profit target too: add it to fixed costs, then divide by the contribution margin. If Elif wants, say, 9,000 TL of profit a month: (27,000 + 9,000) / 90 = 400 candles.
Elif's real question is now much clearer: can she actually sell 400 candles a month, and if not, does she revisit her price or her fixed costs? Break-even analysis turns this conversation into arithmetic instead of a guess.
Find your break-even point, then track it
Rocketly's reporting screen keeps your sales and expense data in one place, so you can watch your break-even target month over month
Try Rocketly for freeMargin of safety: how far above break-even are you?
Knowing your break-even point is not enough; the real question is how far your sales sit above it. That gap is called the margin of safety, worth thinking of as a buffer zone.
Formula: Margin of safety = (Actual sales − Break-even sales) / Actual sales. If Elif sells 400 candles a month, her margin of safety is (400 − 300) / 400 = 25%. Sales could drop by 25% and she would still break even; beyond that, she is in loss territory.
A thin margin of safety means even a small dip in demand can tip a healthy-looking business into a loss.
Seasonal businesses, or ones that depend on one large client, should watch this number closely. A low margin of safety is a signal to think twice before taking on a new fixed cost or launching an aggressive discount.
What happens when price or cost changes?
The break-even point is not fixed; it must be recalculated whenever price, cost, or sales mix changes. Even a small price cut can grow it out of proportion, because a discount comes straight out of the contribution margin.
Say Elif drops her price from 150 TL to 130 TL. Even with the same 60 TL variable cost, contribution margin falls to 70 TL. The new break-even point is 27,000 / 70 ≈ 386 units — roughly 29% more sales for the same fixed costs. Judge discounts by their effect on contribution margin, not revenue alone.
The same logic applies to cost increases: if wax prices rise, either update your price or find savings elsewhere, or the break-even point quietly climbs and margin erodes unnoticed.
The limits of break-even analysis
Break-even analysis is useful precisely because it is simple, but that simplicity has a few limits worth remembering.
- It says nothing about cash timing: having sold 300 candles does not mean the cash is already in your account; if you sell on credit, also track your cash conversion cycle.
- The single-product version is a simplification: selling several products means working out each one's contribution margin and using a weighted average based on your sales mix.
- Fixed costs do not stay fixed forever: past a certain volume you may need another employee, machine, or space, and fixed costs jump to a new level.
- Profit is not the same as cash: you can look profitable on paper while cash is tight because customers pay late; tools like factoring can turn receivables into cash before they are due.
Break-even analysis is not a replacement for your balance sheet or income statement; it is a fast, practical tool that complements them. Jotting it next to your income statement at each month-end keeps the number alive instead of forgotten.
Frequently asked questions
Does the break-even point stay the same every month?
No. It shifts whenever price, cost, or sales mix changes, so recalculate whenever raw-material prices or rent go up.
Do you need an accounting background to calculate it?
No. Just separate costs into fixed and variable and do two simple divisions.
How do you calculate it when selling more than one product?
Work out each product's contribution margin separately, build a weighted average based on your sales mix, then apply the same formula to that average.
Is selling below break-even always a bad idea?
Not necessarily. Short-term pricing below break-even can make sense when launching a product or chasing market share, as long as it stays deliberate and temporary.
How often should you update the break-even point?
Right after any price or cost change, and as a habit, at least once a quarter even if nothing obvious has shifted.
Break-even analysis is not a number you calculate once and file away; it is a living reference point you revisit whenever price, rent, or raw-material cost changes. Track it by hand in a spreadsheet, or watch it automatically in a system that already holds your sales and expense data — Rocketly's reporting screens work well for this. What matters is that next time you set a price or launch a product, “how many do you need to sell” gets answered with a calculation, not a guess.