Break-Even Point Calculator
Determine how many units you must sell to cover all fixed and variable costs — and optionally hit a target profit. Ideal for launching a product, setting sales quotas, or stress-testing a business model.
About this calculator
The break-even point is the sales volume at which total revenue equals total costs, yielding zero profit or loss. The core formula is: Break-Even Units = (fixedCosts + targetProfit) / (pricePerUnit − variableCostPerUnit). The denominator — price minus variable cost — is called the contribution margin per unit: the amount each sale contributes toward covering fixed overhead. When targetProfit is zero, the formula gives the pure break-even quantity. Adding a targetProfit raises the hurdle, telling you exactly how many units generate a specific profit level. If the contribution margin equals zero (price equals variable cost), break-even is undefined because no unit ever contributes to overhead recovery. Multiply break-even units by the selling price to get break-even revenue.
How to use
Imagine monthly fixed costs of $4,000, a variable cost per unit of $12, a selling price of $32, and a target profit of $1,000. Step 1 — Contribution margin: $32 − $12 = $20 per unit. Step 2 — Break-even units: ($4,000 + $1,000) / $20 = $5,000 / $20 = 250 units. Step 3 — Break-even revenue: 250 × $32 = $8,000. You need to sell 250 units per month to cover all costs and earn your $1,000 target profit.
Frequently asked questions
What is contribution margin and why does it matter for break-even analysis?
Contribution margin is the selling price minus the variable cost per unit — the money each sale contributes toward covering fixed costs and generating profit. In the break-even formula it is the denominator, so a higher contribution margin means fewer units needed to break even. Businesses use it to prioritize high-margin products, negotiate pricing floors, and evaluate the impact of cost changes. If you reduce variable costs by $2, the contribution margin rises by $2 and your break-even point drops proportionally.
How do fixed costs differ from variable costs in break-even calculations?
Fixed costs remain constant regardless of production volume — examples include rent, salaries, insurance, and software subscriptions. Variable costs scale directly with each unit produced or sold — examples include raw materials, packaging, and payment processing fees. In break-even analysis, fixed costs form the total overhead that must be recovered, while variable costs reduce the contribution margin available per unit. Misclassifying a cost (e.g., treating a semi-variable cost as fully fixed) will produce an inaccurate break-even point.
When should a business recalculate its break-even point?
You should recalculate whenever a significant input changes: a rent increase, a supplier price change, a new hire, or a pricing adjustment. It is also critical to run break-even analysis before launching a new product, entering a new market, or offering a discount campaign. Seasonal businesses benefit from calculating monthly break-even points rather than annual ones, since fixed costs must still be covered during low-revenue periods. Treating break-even as a living metric rather than a one-time exercise gives early warning when a product line becomes unsustainable.