Break-Even Point Calculator — Units, Revenue, Contribution Margin

The Contribution Margin is What Actually Matters

Most people treat break-even as a formula to memorize, but it is really a story about how much each sale contributes toward covering your fixed costs. That contribution margin sits in the denominator, so a small misclassification swings your break-even point a long way.

Break-even units = Fixed Costs ÷ (Price per Unit − Variable Cost per Unit)

The denominator is your contribution margin: what each sale contributes after its own direct costs are paid.

A worked example, step by step

Fixed costs: $60,000. Price: $25. Variable cost: $10.

Contribution margin: $25 − $10 = $15 per unit.

Break-even units: $60,000 ÷ $15 = 4,000 units.

Break-even revenue: 4,000 × $25 = $100,000.

The Cost Classification Mistake That Ruins the Answer

Fixed costs stay constant no matter what: rent, salaries, insurance, software subscriptions. Variable costs move with volume: materials, shipping, payment fees, per-unit commissions. The trap is semi-variable costs. A delivery van has fixed insurance but variable fuel and maintenance. A salesperson on salary plus commission is both fixed and variable at once. Misfile those and the error lands in the denominator, where it does the most damage: understate variable cost by two dollars a unit and your break-even quietly moves by hundreds of units.

Price Cuts Demand More Than Proportional Volume

This is where break-even thinking saves you. Cut price to $20? Contribution margin becomes $20 − $10 = $10. Break-even rises to $60,000 ÷ $10 = 6,000 units. You cut price 20% but need 50% more volume to break even. Most price cuts do not close that gap.

Honest Limits

This calculator assumes one product at one price, no tax, no seasonality, and no step changes in fixed cost when you move facilities or hire a shift. Real businesses have all of those. Use this to spot whether a single product line clears its fixed costs.

See also: gross margin calculator and markup calculator.