Break-Even Calculator

Contribution margin — price minus variable cost per unit — is what each individual sale actually contributes toward covering a business's fixed costs. Once enough units have been sold to cover fixed costs entirely, every additional unit's contribution margin becomes pure profit, since fixed costs don't grow with volume. This is why raising the contribution margin, whether through a higher price or lower variable costs per unit, lowers the break-even point faster than simply trying to sell more units at the existing margin.

A useful way to think about it: contribution margin percentage tells you how much of every additional sales dollar actually goes toward profit once fixed costs are covered. A business with a 60% contribution margin keeps 60 cents of every incremental sales dollar as profit past break-even, while a business with a 15% contribution margin keeps only 15 cents — meaning it needs far more sales volume above break-even to generate the same additional profit.

Real businesses often see "fixed" costs actually step up in tiers as volume grows, rather than staying perfectly flat indefinitely — a new hire, additional storage or production space, or an upgraded piece of equipment all eventually become necessary once volume crosses a certain threshold. This calculator assumes a single fixed-cost tier and a constant price and variable cost per unit, which works well for a quick estimate but is worth revisiting as volume approaches any known capacity limit where a step-change in fixed costs might occur.

It's also worth noting that this model assumes every unit sells at the same price and costs the same to produce — in practice, discounts, bulk pricing, and economies of scale in production can all shift the actual contribution margin at different volume levels, which a more detailed financial model would capture but this simplified break-even calculation does not.

• Fixed costs — expenses that don't change with sales volume, like rent, salaries, and insurance.
• Variable costs — expenses that scale directly with each unit produced or sold, like materials and per-unit shipping.
• Contribution margin — price minus variable cost per unit; what each sale contributes toward covering fixed costs.
• Break-even point — the sales volume (in units or revenue) at which total revenue exactly equals total costs, with zero profit or loss.

$5,000 in monthly fixed costs, a $25 selling price, and $10 variable cost per unit:

If this business raised its price to $30 while variable cost stayed at $10, the contribution margin would rise to $20 per unit, dropping the break-even point to just 250 units — a one-fifth reduction in required volume purely from a $5 price increase, without any change in cost structure.

• Forgetting some "fixed" costs actually step up at higher volume — a new hire or larger space eventually raises the fixed-cost baseline used in the calculation.
• Ignoring the contribution margin's outsized effect — small improvements to contribution margin often lower break-even faster than proportional increases in sales volume alone.
• Not revisiting the calculation after a price or cost change — break-even point shifts immediately whenever price, variable cost, or fixed costs change.