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Break-even formula explained with a simple example

2026-05-18 10:50 · Pricing Guides

Understand the break-even formula with a simple example that shows fixed costs, contribution margin, and required sales units.

The break-even formula is straightforward once the three main inputs are clear. You need fixed costs, selling price per unit, and variable cost per unit. First, subtract variable cost from selling price to find contribution margin. Then divide fixed costs by that contribution margin.

Imagine a store has 900 dollars in fixed monthly costs. It sells a product for 25 dollars, and each unit costs 10 dollars to source and fulfill. The contribution margin is 15 dollars per unit. Divide 900 by 15 and the break-even point is 60 units.

This example is useful because it shows what the formula is really doing. Break-even point is not only a finance metric. It is a planning tool. It tells you how many units need to move before the business stops absorbing costs and starts generating profit.

It also helps when you compare scenarios. If you raise the price, the contribution margin rises and the break-even point falls. If your variable cost increases, the opposite happens. That makes break-even analysis valuable during supplier reviews, promotion planning, and pricing updates.

For ecommerce sellers, the main benefit is clarity. It becomes easier to compare a sales target with expected traffic, conversion rate, and ad budget. If the break-even unit target looks unrealistic, that is an early signal to revise the plan before spending more time or money.

The Break Even Calculator can make that review faster by giving you the unit target and break-even revenue immediately from the same three inputs.