What Is Break-Even Analysis? Formula and Calculation

By Markets & Investing DeskUpdated Nov 10, 2026

Definition

Break-even analysis finds the sales level, in units or dollars, at which total revenue equals total costs, so a business, product or project shows neither a profit nor a loss.

Key takeaways

The break-even point equals total fixed costs divided by the contribution margin per unit (price minus variable cost per unit).
Dividing fixed costs by the contribution margin ratio gives break-even in sales dollars instead of units.
It assumes constant prices, constant unit costs and linear cost behavior, so it works best as a planning estimate.
Investors and traders use the same logic to find the price at which a position covers its costs.

Break-even analysis is the calculation of the sales level at which total revenue exactly equals total costs, so a business, product or project shows neither a profit nor a loss. That level is the break-even point (BEP), expressed either in units sold or in sales dollars. Below it, each sale reduces the loss. Above it, each sale adds to profit.

How Break-Even Analysis Works

The analysis sorts costs by how they behave as volume changes.

Fixed costs stay the same in total regardless of how many units are produced or sold, within a normal operating range. Variable costs rise and fall in proportion to output.

Fixed costs	Variable costs
Rent	Raw materials
Insurance	Production supplies
Salaried wages	Packaging
Property taxes	Production utilities
Depreciation	Sales commissions

Each unit sold brings in its price, pays for its own variable cost, and leaves a remainder that goes toward fixed costs. Once those remainders add up to total fixed costs, the business has broken even. Lower fixed costs mean reaching that point sooner, and a firm with no fixed costs breaks even on its first sale if the price exceeds the variable cost per unit.

Break-Even Formula

The core break-even formula is:

BEP (units) = Total fixed costs / (Price per unit - Variable cost per unit)

The denominator, price minus variable cost per unit, is the contribution margin per unit.

To find break-even revenue, use the contribution margin ratio, the share of each sales dollar left after variable costs:

Contribution margin ratio = Contribution margin per unit / Price per unit

BEP (sales dollars) = Total fixed costs / Contribution margin ratio

Both versions describe the same point: for a single product with a single price, break-even in dollars equals break-even units multiplied by the price.

Example of Break-Even Analysis

Hypothetical example. A small company sells a kitchen gadget for $50. Each unit costs $30 in materials, packaging and shipping. Monthly fixed costs (rent, insurance, salaries and equipment depreciation) total $40,000.

Contribution margin per unit: $50 - $30 = $20
Break-even in units: $40,000 / $20 = 2,000 units per month
Contribution margin ratio: $20 / $50 = 0.40, or 40%
Break-even in sales dollars: $40,000 / 0.40 = $100,000 per month

At 2,000 units, revenue is $100,000 and total costs are $40,000 fixed plus $60,000 variable, so profit is exactly zero. The 2,001st unit produces the first $20 of profit.

Target Profit

The same formula answers a related question: how many units are needed to earn a specific profit? Add the target to fixed costs:

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

If the company wants $10,000 of monthly operating profit: ($40,000 + $10,000) / $20 = 2,500 units. This figure is before income tax. A target stated after tax must first be divided by (1 - tax rate).

Margin of Safety

The margin of safety is the gap between actual (or budgeted) sales and break-even sales. It shows how far sales can fall before the operation starts losing money.

Margin of safety = Actual sales - Break-even sales

If the company sells 2,600 units, its margin of safety is 600 units, or $30,000 of revenue. As a percentage of actual sales, that is $30,000 / $130,000, about 23%.

Cash, Accounting and Financial Break-Even

“Break-even” can be measured against different definitions of cost, and the answers differ.

Accounting break-even is the standard calculation above, with all fixed costs, including non-cash charges such as depreciation, in the numerator. It is the volume at which accounting profit is zero.
Cash break-even removes non-cash fixed costs. In the example, if $8,000 of the $40,000 is depreciation, cash break-even is $32,000 / $20 = 1,600 units. At that volume, operating cash inflows cover cash outflows even though the income statement still shows a loss.
Financial break-even in capital budgeting is the sales level at which a project’s net present value is zero, meaning it covers not just costs but also the required return on the money invested, typically the firm’s weighted average cost of capital. Because it charges for capital, it sits above accounting break-even. In some corporate-finance texts, the term instead refers to the operating profit (EBIT) needed to cover fixed financing charges such as interest and preferred dividends, leaving earnings per share at zero.

Why Break-Even Analysis Is Important for Planning

Pricing: Raising the price widens the contribution margin and lowers the break-even volume. Testing several prices shows how much volume each one requires.
New products and expansion: Before launching a product, opening a location or adding capacity, managers can compare the required break-even volume with realistic demand estimates.
Cost structure decisions: Replacing variable costs with fixed ones (for example, automating production) usually raises the break-even point but increases profit per unit beyond it. This trade-off is the basis of operating leverage.

Break-Even for Investors and Traders

Investors apply the same principle to a single position: the break-even price is the level at which the trade covers what it cost. For a long stock position, that is the purchase price plus commissions and fees. For options, the premium paid is the cost to recover. A long call breaks even at expiration when the underlying trades at the strike price plus the premium paid, and a long put at the strike minus the premium. This level shows how far a price must move before a trade becomes profitable.

Limitations of Break-Even Analysis

Constant prices and costs: The model assumes one selling price and fixed unit costs. In practice, volume discounts, promotions, supplier price changes and inflation alter both.
Linear relationships: It treats costs and revenue as straight lines. Real costs can be step functions (a second shift, a new warehouse) that jump at certain volumes.
Single product or fixed mix: With several products, break-even depends on the sales mix and requires a weighted-average contribution margin, which changes whenever the mix changes.
No demand information: The formula states how many units must be sold, not whether customers will buy them. Competition, market demand and changing preferences sit outside the model.
Cost classification: Many costs are mixed (partly fixed, partly variable), and splitting them requires judgment.
Short-term view: Accounting break-even ignores the time value of money, which is why capital projects are also evaluated with tools such as NPV and internal rate of return.

Break-even point vs. payback period: The break-even point is a sales volume in a given period. The payback period (sometimes loosely called break-even time) is the time needed for cumulative cash inflows to recover an initial investment.
Contribution margin vs. gross margin: Contribution margin subtracts only variable costs. Gross margin subtracts cost of goods sold, which can include fixed production overhead. Only contribution margin works in the break-even formula.
Break-even vs. profitability: Reaching break-even means costs are covered, not that the business earns an adequate return for its owners.

FAQs

Can a business with negative contribution margin break even?

No. If variable cost per unit exceeds the price, every additional sale increases the loss, and no volume reaches break-even until the price or unit cost changes.

The Bottom Line

Break-even analysis helps business owners and managers test prices, product launches and cost structures against realistic demand, and it gives investors the price a position must reach to cover its costs. Because the model assumes constant prices, constant unit costs and a fixed sales mix, the result works best as a planning estimate. Covering costs is only a minimum, so pair break-even with the margin of safety, NPV or other return measures before committing capital.