Break-Even Calculator

How to use the break-even calculator

Enter three numbers — your fixed costs, the price you charge per unit, and the variable cost to make or deliver one unit — and the calculator returns the break-even point in both units sold and revenue. The defaults stand in for a typical small business: $10,000.00 in fixed costs, a $25.00 price, and a $15.00 variable cost break even at 1,000 units, or $25,000.00 in revenue. Change any input and the result updates immediately, so you can watch a price bump or a cheaper supplier move the number.

The idea behind break-even is simpler than it sounds. Every sale brings in the price but also costs you the variable cost to fulfill it, so what is left over — the price minus the variable cost — is the part of that sale that goes toward covering your fixed costs. That leftover is the contribution margin. Break-even is just the point where enough sales have stacked up their contribution margins to cover the fixed costs entirely. Sell one more unit past that point and its margin is no longer paying off overhead — it is profit.

Getting the two cost types straight is what makes the answer meaningful. Fixed costs are the ones you pay no matter how much you sell — rent, salaries, insurance, the software subscriptions that renew whether you ship one order or a thousand. Variable costs scale with each unit — materials, the per-unit labor to assemble it, packaging, shipping. Put a cost in the wrong bucket and the break-even point will be off, because the math treats fixed costs as the hill to climb and variable costs as a drag on every single sale.

The contribution margin is the real lever, and it is worth dwelling on. Because break-even is fixed costs divided by that margin, widening the margin pulls the break-even point down hard. Raise the price a couple of dollars or shave a dollar off the variable cost and each sale contributes more, so you need fewer of them — often a far more powerful move than simply chasing more volume at the same thin margin. Note the one case where break-even does not exist: if your price does not exceed the variable cost, every unit loses money, the margin is zero or negative, and no amount of volume will ever get you there.

To run your own number, drop in your real fixed costs for the period, the price you actually charge, and an honest variable cost per unit, then read off the units and revenue you need to clear the line. Units are whole — you cannot sell a fraction of a unit to break even, so the figure rounds up. Treat the result as a planning estimate for general information; pair it with your own forecasts before you commit to a price or a production run.

The formula

Break-even works in two steps: first find what each sale contributes after its variable cost, then count how many of those contributions it takes to cover the fixed costs.

contribution margin = price per unit − variable cost per unit
break-even units = fixed costs ÷ contribution margin      (rounded up)
break-even revenue = break-even units × price per unit

Worked example with the defaults — $10,000.00 in fixed costs, a $25.00 price, and a $15.00 variable cost: the contribution margin is 25 − 15 = $10.00 per unit, so you break even at 10,000 ÷ 10 = 1,000 units, which at $25.00 each is $25,000.00 in revenue. Every unit you sell beyond that 1,000th adds its full $10.00 margin straight to profit.

Because break-even is fixed costs divided by the margin, the margin is the lever that moves it most. Push the price to $30.00 and the margin widens to $15.00, dropping break-even to 667 units. Trim the variable cost to $12.00 instead and the $13.00 margin needs about 770 units. But if the price ever falls to or below the $15.00 variable cost, the margin is zero or negative and there is no break-even at all — each sale only deepens the loss, so the answer is to fix the pricing, not sell more.

Frequently asked questions

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