Break-even calculator

One idea, and it is contribution

Costs come in two kinds. Fixed costs arrive whether or not you sell anything: rent, software, insurance, a salary. Variable costs arrive per sale: materials, packaging, shipping, payment fees, whatever you buy in to deliver one of something.

What a sale leaves after its own variable cost is its contribution, and contribution is what pays down the fixed costs. Once they are covered, every further contribution is profit. So the whole calculation is one division: fixed costs divided by contribution per sale.

At $6,000 of fixed costs a month, a $40 price and a $15 cost per sale, each sale contributes $25 and it takes 240 of them, $9,600 of sales, before anything is profit.

The split is about what drives a cost, not its size

A large yearly insurance premium is a fixed cost; a few cents of postage per order is a variable one. The test is simple: if you sold one more tomorrow, would this bill change? If not, it is fixed.

The awkward ones are usually people. A salary is fixed. A freelancer you bring in per project is variable. Your own time is neither until you decide how to treat it. If you pay yourself out of the fixed costs, put it there; if the work only happens when a job does, it belongs in the cost per sale.

When there is no break-even point at all

If the cost per sale equals or exceeds the price, the contribution is zero or negative and no volume ever breaks even. At a negative contribution, selling more makes the loss bigger.

This tool says so rather than returning an enormous number, because the mistake it prevents is real and expensive: the situation gets read as a volume problem and answered with more marketing, when nothing except the price or the unit cost can fix it.

Margin of safety

If you say what you expect to sell, the panel shows how far that sits above the break-even point. Expecting 400 against a break-even of 240 gives a margin of safety of 160 sales, or 40%. Sales could fall by two fifths before the business stopped covering its costs.

It is a more honest measure of exposure than the profit figure alone. Two businesses can forecast the same profit with very different amounts of room underneath them.

For a freelancer or a service business

It works the same way, and the unit can be an hour, a project, a client or a booking. Fixed costs are what arrive whether or not work comes in. The price is what you charge for one of them. The cost per sale is whatever you buy in to deliver it, often nothing, in which case each sale contributes its whole price and the break-even point is simply your fixed costs divided by your fee.

What the figure is not

It holds one price and one cost per sale at every volume, which real businesses do not: materials get cheaper in bulk, hours get more expensive past a point, and fixed costs step up when you outgrow a space or hire someone. Tax, financing, stock sitting unsold and the wait between making a sale and being paid for it are all absent.

It is a planning figure, a threshold to check a price or a cost base against, and not a forecast of what will happen.