Break Even Calculator

Break even analysis answers one question: how many units do you have to sell before you stop losing money? The whole calculation rests on separating your costs into two kinds. Fixed costs stay the same no matter how much you sell, such as rent, salaries, insurance, and software subscriptions. Variable costs rise with every unit you produce or ship, such as materials, direct labor, packaging, shipping, and payment processing fees.

Enter your total fixed costs for a period, then your selling price per unit and your variable cost per unit. The calculator first works out the contribution margin, which is the price minus the variable cost. That figure is the amount each individual sale contributes toward paying off your fixed costs. It is the single most important number in the model, because until fixed costs are fully covered, every sale is chipping away at a deficit rather than producing profit.

Divide fixed costs by the contribution margin per unit and you get the break even volume. The result is rounded up, because a fraction of a unit does not actually cover anything: if the arithmetic says 33.3 units, you need to sell 34 before you are genuinely in the black. Multiplying that volume by your price gives break even revenue, which is often the more useful figure when you are comparing against a sales forecast expressed in currency rather than units.

Two optional inputs make the tool more useful for planning. Enter your current or forecast unit volume and the calculator reports your margin of safety, the cushion between where you are and where you would start losing money, expressed in both units and as a percentage. Enter a target profit and it reports the volume required to earn it, treating the profit as though it were an additional fixed cost that also has to be covered by contribution margin.

A small furniture workshop has fixed costs of 50,000 per year covering workshop rent, one salaried employee, insurance, and accounting software. It sells a chair for 100. The wood, hardware, finish, and shipping for each chair come to 60. The contribution margin is 100 minus 60, which is 40 per chair, or 40 percent of the selling price. Dividing 50,000 of fixed costs by the 40 contribution margin gives a break even volume of 1,250 chairs per year, which is 125,000 in revenue.

Suppose the workshop currently sells 2,000 chairs a year. The margin of safety is 750 chairs, or 37.5 percent, meaning sales could fall by more than a third before the business slipped into a loss. Now add a target: the owner wants 20,000 of annual profit. Treating that profit as an extra cost to cover, the required volume becomes 50,000 plus 20,000 divided by 40, which is 1,750 chairs. Notice how sensitive the model is to margin rather than price. Cutting the variable cost from 60 to 50 lifts the contribution margin to 50 and drops break even from 1,250 chairs to 1,000, a 20 percent reduction from a 10 percent cost saving.

Use break even analysis before launching a product, signing a lease, hiring a first employee, or taking on any commitment that raises your fixed costs. It converts an abstract worry into a concrete sales target, and that target is usually the fastest way to sanity check a plan. If the volume required looks unreachable given your market size or capacity, the problem is in the pricing or the cost structure, not in the effort you intend to put in.

It is equally useful for pricing decisions. Because break even volume moves inversely with contribution margin, small changes in price or unit cost shift the required volume far more than most people expect. Run the calculator at several price points before settling on one. Pair it with the gross margin calculator when you sell more than one product, and with the burn rate and runway calculator when you want to know how long your cash lasts while you climb toward that volume.

The most frequent error is misclassifying costs. Anything that scales with volume belongs in variable costs, and anything that does not belongs in fixed costs. Payment processing fees, shipping, and sales commissions are variable and are often wrongly parked in fixed costs, which understates break even volume and makes the plan look safer than it is. Semi variable costs such as a phone plan with a base fee plus usage should be split, with the base portion in fixed and the usage portion in variable.

A second mistake is forgetting to pay yourself. If you are a founder or sole trader and your own salary is not in fixed costs, the break even figure describes the point where the business covers everything except you, which is not really break even at all. A third is treating the result as a fixed truth. Break even volume assumes constant price and constant unit cost, but discounts, bulk pricing, supplier increases, and shipping surcharges all move the answer, so rerun the numbers whenever those change.

This calculator models a single product with a constant selling price and constant variable cost per unit at every volume, and assumes fixed costs remain flat as output grows. It does not model volume discounts, tiered supplier pricing, step costs where fixed costs jump at a capacity threshold such as a second shift or larger premises, seasonality, inventory timing, the difference between units produced and units sold, or the cash flow gap between paying suppliers and collecting from customers. It also ignores taxes, so the target profit figure is a pre tax number. Results are educational estimates and should not replace advice from a qualified accountant.

This calculator covers the classic single product case. If you sell several products at different margins, the multi product breakeven calculator uses a weighted average contribution margin based on your sales mix, which is the correct approach when the mix is stable. The gross margin calculator is the better starting point when you want to rank product lines by unit margin and total contribution before deciding where to focus.

Break even tells you the volume you need, not how long your cash lasts while you get there. The burn rate and runway calculator answers that second question, and the two are worth running together before committing to a fixed cost increase. For subscription businesses where customers recur rather than buy once, the LTV and CAC ratio calculator is a better fit than unit break even.