Break-Even Analysis: The Formula and a Worked Example

Break-even analysis finds the sales level where your business stops losing money and starts making it: the point where total revenue exactly equals total cost, so profit is zero. The U.S. Small Business Administration puts it plainly, calling the break-even point "the point at which total cost and total revenue are equal, meaning there is no loss or gain for your small business" (SBA, Break-even point). Find it and you know the floor every month has to clear before a single dollar of profit exists. The whole calculation rests on splitting your costs into two kinds, and that split, not the arithmetic, is where most owners go wrong.

What break-even analysis tells you

Every cost your business pays falls into one of two buckets. Fixed costs stay the same no matter how much you sell: rent, insurance, software subscriptions, a loan payment. The SBA defines them as "costs incurred during a specific period of time that do not change with the increase or decrease in production or services." Variable costs move with volume: the materials in each product, packaging, payment-processing fees, the wholesale cost of goods you resell. Sell nothing and your variable costs are zero; sell more and they climb in step.

The break-even point is where the money each sale contributes has finally covered all the fixed costs. Below it you lose money; above it you profit. It is a planning number, not a tax figure, so it never appears on your Schedule C. But it comes from the same records: the fixed and variable costs your books already track, and the sales your income tracker records.

The break-even formula

There are two versions of the formula, one measured in units and one in sales dollars. Start with the piece both share: contribution margin, the profit each sale contributes toward fixed costs before any fixed cost is subtracted.

Contribution margin per unit = Sales price per unit − Variable cost per unit

The SBA states the two break-even formulas directly:

Break-even point (units) = Fixed costs ÷ (Sales price per unit − Variable cost per unit)

Break-even point (sales dollars) = Fixed costs ÷ Contribution margin ratio

The contribution margin ratio is that same per-unit contribution as a share of the price: (price − variable cost) ÷ price. The units formula answers "how many do I have to sell?"; the dollars formula answers "how much revenue do I have to bring in?". They describe the same point from two angles.

One business, worked all the way through

Take a candle maker who sells online and at weekend markets. Each candle sells for $24. The wax, wick, jar, and label that go into it cost $9. Her fixed costs run $4,500 a month:

First, the contribution margin. Each candle sells for $24 and costs $9 in materials, so every candle contributes $24 − $9 = $15 toward fixed costs. As a ratio, that is $15 ÷ $24 = 62.5% of the price.

Now the break-even point in units:

$4,500 ÷ $15 = 300 candles per month

And in sales dollars:

$4,500 ÷ 0.625 = $7,200 per month

The two agree: 300 candles at $24 each is exactly $7,200. Below 300 candles she loses money; the 301st candle is the first to leave $15 of profit on the table. Her first job every month is those 300 candles, roughly 10 a day. Everything after that is profit.

Break-even with a profit target

Break-even is the floor, not the goal, so the more useful question is usually "how many do I need to sell to make the profit I want?" Add the target profit to fixed costs and divide by the same contribution margin:

Units for target profit = (Fixed costs + Target profit) ÷ Contribution margin per unit

If the candle maker wants $1,500 of profit a month:

($4,500 + $1,500) ÷ $15 = 400 candles, or $9,600 in sales

Check it: 400 candles contribute 400 × $15 = $6,000, minus $4,500 of fixed costs, leaves exactly $1,500. The target-profit version turns break-even from a survival line into a concrete sales plan.

The levers that move your break-even point

Because the formula has only three inputs, only three things can lower the number of sales you need: raise the price, cut the variable cost per unit, or cut fixed costs. Each moves the point in a different way.

Raising the price $4 does the most work here, dropping break-even from 300 candles to 237, because it widens the margin on every sale. A price change is also the fastest to make. This is the same relationship behind markup and margin: a few dollars of price move the profit on every unit, so they move the whole break-even point with it.

Running break-even for a service business

A consultant, designer, or bookkeeper who sells time, not products, has almost no variable cost per sale, so the per-unit formula collapses toward a simpler truth: break-even revenue is roughly your fixed monthly costs. If a freelance designer's fixed costs (software, a coworking desk, insurance) come to $2,000 a month and her billable work carries no material cost, she breaks even the month she invoices $2,000 of paid work. Everything above that is profit; everything below eats savings.

When a service does carry variable costs, subcontractors, per-project software, travel billed at cost, use the sales-dollars formula with the contribution margin ratio. Say $30 of every $100 billed goes to variable costs, leaving a 70% contribution margin ratio. Then $2,000 ÷ 0.70 = $2,857 of billings to break even. The ratio version works for any business where "units" are awkward to define.

Contribution margin is not the same as gross margin

Two profit ratios sound alike and get mixed up. Gross margin subtracts the cost of goods sold from sales; it is the gross profit figure your books report. Contribution margin subtracts every variable cost, which can include variable selling costs like payment-processing fees or sales commissions that never touch cost of goods sold. The two often land close, but contribution margin is built for the break-even question specifically: it isolates exactly the money each additional sale frees up to cover fixed costs.

Common misconceptions

"Hitting break-even means I'm doing fine." Break-even is zero profit, not success. It is the line where you have covered your costs and taken home nothing. It marks where the business stops draining money, and the goal is to sell well past it, which is why the target-profit version of the formula is the one worth planning around.

"Fixed costs are one-time and variable costs are recurring." The split has nothing to do with timing. Rent recurs every month and is fixed because it does not change with how much you sell. Materials are variable because they rise and fall with volume, even though you buy them constantly. Classify by whether the cost tracks sales, not by how often you pay it, or your break-even number will be wrong.

"I calculate break-even once and I'm done." The point shifts the moment any input changes. A rent increase, a supplier raising materials 10%, or a price cut to win customers all move the line. Recompute it whenever a price or a major cost changes, and your books make that a two-minute job rather than a rebuild.

Frequently asked questions

What is the break-even formula? Break-even point in units = fixed costs ÷ (sales price per unit − variable cost per unit). In sales dollars, it is fixed costs ÷ the contribution margin ratio, where the ratio is (price − variable cost) ÷ price (SBA).

What is contribution margin? It is what each sale contributes toward fixed costs: the selling price minus the variable cost of that sale. A $24 candle with $9 of materials has a $15 contribution margin per unit, or 62.5% as a ratio.

How is a fixed cost different from a variable cost? A fixed cost stays the same regardless of sales volume (rent, insurance, subscriptions). A variable cost changes with volume (materials, packaging, processing fees). The classification is about whether the cost moves with sales, not how often you pay it.

Does break-even analysis go on my tax return? No. It is an internal planning tool, not a tax figure, so it never appears on Schedule C. It draws on the same expense and income records your books already keep.

How do I lower my break-even point? Raise the price, reduce the variable cost per unit, or cut fixed costs. Raising the price usually moves it fastest, because it widens the margin on every sale at once.

Key takeaways

• Break-even is where total revenue equals total cost. Below it you lose money, above it you profit, and at it you make exactly zero.
• Split every cost into fixed or variable first. Fixed costs ignore sales volume; variable costs track it. Getting this split wrong is the most common way the calculation fails.
• Contribution margin drives the formula. Break-even units = fixed costs ÷ (price − variable cost); break-even dollars = fixed costs ÷ contribution margin ratio.
• Add your target profit to plan, not just survive. Units for a target = (fixed costs + target profit) ÷ contribution margin per unit.
• Three levers move the point: a higher price, a lower variable cost, or lower fixed costs. Price changes usually move it the most.

Break-even is only as accurate as the fixed and variable costs behind it, and those change all year. Capture every expense as it happens and keep income current, so recomputing your break-even point is a two-minute check rather than a year-end reconstruction. Get Started with SparkReceipt to keep the numbers behind your break-even point in one place, from an expense tracker that files each cost to an income tracker that shows what your sales actually brought in.