This is probably the most useful calculation in running a small business, and it fits in one division. It answers a question everyone asks themselves without ever asking it clearly: how much do I need to sell to stop losing money?
People who know this number by heart are steering. The others watch their bank account and hope.
Definition
The break-even point is the revenue level, or the number of sales, at which Gross margin exactly covers fixed costs. Below it you lose. Above it, every additional sale is profit.
Sales needed = monthly fixed costs ÷ gross margin per sale
With €1,800 of fixed costs and €45 of margin per sale: 1,800 ÷ 45 = 40 sales a month.
The calculation requires cleanly separating the two kinds of cost, and that is where most errors hide.
The threshold is reachable. Every sale beyond it is profit.
Try cutting fixed costs by 20 percent, then raising the price by 20 percent. The threshold does not move the same way: fixed costs shift it proportionally, price acts through margin, so it bites harder when variable cost is low.
Move the sliders above: the crossing point between the revenue line and the cost line is your break-even. What jumps out is that fixed costs shift the point far more violently than sale price does, for the same variation.
What is fixed, what is variable
| Fixed costs | Variable costs |
|---|---|
| Software subscriptions | Payment fees |
| Base hosting | Usage-based hosting |
| Accountant, insurance | Affiliate marketing commissions |
| Your own pay | Raw materials, stock |
The last row on the left is the omitted one. A break-even calculated without paying yourself gives a reassuring, false number. Include what you need to earn to live, or you are calculating the company's survival threshold, not yours.
Two ways to lower it
Cut fixed costs
The most immediate and most underrated action. Every subscription cancelled lowers the threshold permanently, with no dependence on the market. For a Bootstrapping business it is the first reflex, before any search for growth.
Raise margin per sale
Either through price or by cutting variable costs. A product sold at €60 instead of €50, at constant costs, cuts the sales needed by roughly a fifth.
Frequently asked questions
Should I calculate it in sales or in euros?
In sales, because that is a number you can picture. "Forty customers" is visualisable, "€3,600 of revenue" much less so. For a subscription, think in active subscribers to sustain.
How do I adapt it to a subscription model?
Divide fixed costs by monthly margin per subscriber. Careful: that number must be sustained, not reached once. With Churn rate, staying at break-even means replacing leavers every month.
What if the threshold looks unreachable?
That is valuable information, obtained before spending anything. Three ways out: cut fixed costs, raise the price, or change model. Persevering without changing anything is not one of them.
How often should I recalculate it?
Whenever fixed costs change, so in practice every quarter. Software subscriptions accumulate unnoticed, and the threshold climbs silently with them.