Break-Even Point Calculator

Background.

A break-even point calculator answers the single most important question any new product, project, or business has to answer before launch: how many units do we need to sell, or how much revenue do we need to book, before the operation stops losing money? It is the foundational calculation of cost-volume-profit (CVP) analysis, taught in every managerial accounting course from Garrison and Noreen's standard text to Horngren and Datar's Cost Accounting, and it is the first number a competent founder, finance lead, or product manager will run before signing a lease, ordering inventory, or hiring a sales team.

The mechanics are straightforward. Take the fixed costs you must pay each period regardless of volume — rent, salaried payroll, insurance, scheduled debt service, software subscriptions, the depreciation on equipment you already bought — and divide them by the contribution margin per unit, which is the selling price minus the variable cost of producing one more unit. The result is the number of units you must sell before the next dollar of revenue stops covering costs and starts dropping to operating profit. Multiply that unit count by the price and you get the break-even revenue figure that boards and bank loan officers ask for.

This calculator returns four numbers in one pass: break-even units, break-even revenue, contribution margin per unit in dollars, and the contribution margin ratio as a percentage of price. The unit number is the operating target. The revenue number is the planning target. The contribution margin per unit tells you how much each incremental sale is worth to the business once you have crossed the break-even line — every dollar of contribution above break-even goes straight to operating profit, which is why high-contribution-margin businesses scale so explosively once they reach the inflection point. The contribution margin ratio is the operating-leverage indicator: a software business charging $50 per seat with $2 of marginal cost has a 96% ratio and devastating economics once volume arrives; a grocery store charging $50 for a basket with $40 of cost of goods has a 20% ratio and has to push enormous volume just to keep the lights on. The same calculator covers both extremes.

What it cannot do — and this is where most people misuse break-even analysis — is replace judgment. The model assumes a single product, a single price, linear variable costs, perfectly stepped fixed costs, and a static market. In reality, volume discounts kick in, sales teams need to be added every few thousand customers, software hosting bills jump in steps, and competitors react to your pricing. Break-even is a planning tool, not a goal. Hitting break-even means you have stopped losing money — it does not mean you are earning enough to justify the capital, the risk, or the opportunity cost of the founders' time.

The serious version of this calculation extends to target-profit analysis: instead of dividing fixed costs alone by contribution margin, divide fixed costs plus the operating profit you actually need by contribution margin. The result is the unit volume that hits both break-even and a real return on capital. The page below the calculator walks through both versions of the formula, the limits of the linear CVP model that academic accounting literature has documented for fifty years, the SaaS-versus-manufacturing contrast that makes contribution margin so important, and a worked example you can replicate against your own numbers. Run the calculator first, then read the explainer so the number you came for is the number you actually need.

What is break-even point calculator?

Break-even point is the sales volume at which total revenue exactly equals total cost — the point where operating profit is zero, neither gained nor lost. In unit terms, it is fixed costs divided by the contribution margin per unit (price minus variable cost per unit). In dollar terms, it is fixed costs divided by the contribution margin ratio (contribution margin per unit divided by price). Both forms come from the same cost-volume-profit (CVP) equation: profit = (price × units) − (variable cost × units) − fixed costs. Setting profit to zero and solving for units gives the break-even formula. The contribution margin is the dollar amount each additional unit contributes toward covering fixed costs and then generating profit; below break-even, every unit's contribution margin chips away at the unrecovered fixed cost base; above break-even, every unit's contribution margin flows directly to operating profit. The contribution margin ratio expresses that figure as a percentage of price, which makes it the canonical measure of operating leverage. Standard managerial accounting texts (Garrison, Noreen & Brewer; Horngren, Datar & Rajan) treat break-even analysis as the first step of CVP, immediately followed by target-profit analysis — the extension that solves for the volume needed to hit a chosen profit goal rather than just break even. The U.S. Small Business Administration recommends a documented break-even analysis as a mandatory section of any business plan submitted for a small-business loan.

How to use this calculator.

1. 01Enter your fixed costs per period — the recurring costs you pay regardless of whether you sell one unit or one thousand. Include rent, salaried payroll, business insurance, software subscriptions, scheduled depreciation, debt service interest, and any contractual minimums. Use the same period (month, quarter, year) consistently — break-even units will be expressed per that same period.
2. 02Enter the price per unit — your actual realized selling price, net of routine discounts, allowances, and expected returns. For subscription or service businesses, use the average revenue per customer per period. For variable-priced sales, use the weighted average price across your typical sales mix.
3. 03Enter the variable cost per unit — every cost that scales linearly with one additional unit sold. For physical products this is cost of goods (materials, packaging, inbound freight); for software it is payment processing, per-customer hosting, and any third-party API charges; for services it is direct labor and per-engagement materials. Sales commissions on a per-unit basis belong here, not in fixed costs.
4. 04Read the four outputs. Break-even units is the volume target. Break-even revenue is the same target expressed in sales dollars. Contribution margin per unit tells you what each incremental sale is worth above break-even. Contribution margin ratio expresses that as a percentage and is the cleanest single-number indicator of operating leverage.
5. 05Extend to target profit. To find the volume needed to hit a specific operating profit, mentally add your profit target to the fixed-cost input and re-run the calculator. The new break-even units becomes the volume required to earn that profit. This is the standard target-profit extension covered in every CVP textbook chapter.
6. 06Stress-test against the linearity assumption. Real fixed costs rise in steps (a second warehouse, a second sales rep, a new server tier); real variable costs change with volume discounts; real prices flex with the market. Recalculate at the volume level where you expect the next step change in fixed costs to occur, and use the higher of the two break-even points as your planning figure.

The formula.

The break-even point in units is computed as: break-even units = fixed costs ÷ (price per unit − variable cost per unit). The denominator is the contribution margin per unit — the dollar amount each unit contributes toward covering fixed costs. Once contribution margin is known, the four outputs follow directly. Break-even revenue is simply break-even units multiplied by price per unit, which is mathematically equivalent to fixed costs divided by the contribution margin ratio. The contribution margin ratio is calculated as contribution margin per unit divided by price per unit, expressed as a percentage. The target-profit extension generalizes the formula: target units = (fixed costs + target operating profit) ÷ contribution margin per unit. When variable cost per unit equals or exceeds price per unit, contribution margin is zero or negative and the business cannot break even at any volume — the calculator returns Infinity in that case, which is the mathematically correct answer and the signal that either the price needs to rise or the variable cost structure needs to be rebuilt before scale matters. All arithmetic is performed in decimal math; unit results are rounded up to the next whole unit because partial units do not generate revenue in practice.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Garrison, R. H., Noreen, E. W., & Brewer, P. C. (2024). Managerial Accounting (18th ed., Chapter 5: Cost-Volume-Profit Relationships). McGraw-Hill Education.
2. [2]Horngren, C. T., Datar, S. M., & Rajan, M. V. (2023). Cost Accounting: A Managerial Emphasis (17th ed., Chapter 3: CVP Analysis). Pearson.
3. [3]U.S. Small Business Administration — Calculate your startup costs and run a break-even analysis (official business-plan guidance).
4. [4]U.S. Small Business Administration — Write your business plan (break-even analysis as a required financial projections section).
5. [5]Investopedia — Break-Even Analysis: Definition and Calculation (peer-reviewed reference entry).
6. [6]Harvard Business Review — "The Economics That Made Amazon" and related coverage of unit economics and contribution margin as the foundation of scalable business models.
7. [7]Drury, C. (2020). Management and Cost Accounting (11th ed.). Cengage Learning — international peer-reviewed treatment of CVP analysis, target-profit extension, and the limits of the linear cost-behavior assumption.