What break-even actually answers
Break-even is the volume at which you stop losing money and have not yet started making any. Below it every month costs you; above it every additional sale is profit. It is the single most useful number to know before committing to a price, a lease or a product line, because it converts a vague question — can this work? — into a specific one: can we sell this many?
The reframing is the whole value. "Is $75 a good price for this?" has no answer without context. "At $75 we need 334 units a month" is something you can test against your market, your capacity and your pipeline.
The formula, and the one number it all hangs on
Two steps. First, work out what one sale contributes:
Contribution margin = price − variable cost per unit
Then divide your fixed costs by it:
Break-even units = fixed costs ÷ contribution margin
At $15,000 of monthly fixed costs, a $75 price and $30 of variable cost, each sale contributes $45 and you need 334 units. In revenue that is $25,000, which you can reach the same way by dividing fixed costs by the contribution margin ratio of 60%.
Everything depends on the contribution margin, and it has one hard boundary: if it is zero or negative, there is no break-even at any volume. Selling below variable cost means every additional sale deepens the loss, and no amount of scale fixes it. The calculator says so plainly rather than printing an enormous number.
One detail on rounding. The arithmetic often gives a fraction — 2,769.23 units, say — and a partial unit pays no bills. Selling 2,769 leaves you $1.50 short of covering an $18,000 fixed base, so you have not broken even. This page rounds the answer up and shows the exact figure alongside, because the exact one is what the revenue and margin-of-safety numbers are built from.
Sorting fixed from variable — where most errors start
The formula is trivial. Deciding which bucket each cost belongs in is not, and it is where break-even calculations usually go wrong.
Fixed means unchanged by volume: rent, salaried staff, insurance, software subscriptions, accountancy fees. You pay them whether you sell one unit or a thousand.
Variable means it moves with each sale: materials, packaging, payment processing, shipping, per-unit labour, sales commission.
The awkward ones sit between. A salesperson on commission is variable; the same person on salary is fixed. Utilities are usually mostly fixed with a small volume-linked element. Delivery is variable per order but the van lease is fixed. When you genuinely cannot decide, put it in fixed. That raises your break-even and gives you the more cautious answer, which is the right direction to be wrong in.
Watch for step-fixed costs too. Rent is fixed until you outgrow the unit; one oven covers a certain volume and then you need a second. Break-even assumes a flat fixed base, so if your plan crosses one of those steps, run the numbers on both sides of it.
What to put in each field
Fixed costs. Total for whatever period you are working in — monthly is most common. Be complete: the costs people forget are their own salary, accounting, insurance and software, and leaving them out produces a break-even that looks achievable and is not.
Price per unit. What the customer actually pays after standard discounts, not the list price. If a third of your sales go out at 20% off, your effective price is lower than the sticker.
Variable cost per unit. Everything that only exists because you made that sale. Payment processing at around 3% is the one most often missed, along with returns and shipping.
Units you expect to sell. Optional. Add it and you get your margin of safety — how far your forecast sits above break-even — plus the profit at that volume. Above 20% is generally comfortable; below 10% means small misses turn into losses.
Profit you want. On the target tab. It is added to fixed costs, since you now need to cover both before you are done.
Three levers, and which one actually moves the number
You have exactly three ways to lower a break-even point, and they are not equally powerful.
- Raise the price. Usually the strongest, because the whole increase lands in the contribution margin — a $75 price rising to $82.50 adds $7.50 to a $45 margin, a 17% improvement, from a 10% price move.
- Cut the variable cost. Same mechanism, and often more achievable, but the numbers are smaller: shaving 10% off a $30 variable cost adds $3 to the margin.
- Cut fixed costs. Moves the break-even proportionally — 10% off fixed costs lowers it by exactly 10%, no more.
The comparison table above the article runs each of these on your own numbers. The pattern usually holds: price beats cost cuts, and cost cuts beat overhead cuts.
The caveat is that price is the only lever with a customer attached. The arithmetic assumes volume holds when the price moves, and it often does not. A 10% price rise that costs you 15% of your units leaves you worse off, so treat the price row as the ceiling of what is available rather than a plan.
Break-even when you sell more than one thing
Almost nobody sells a single product, and the fix is to blend. Weight each item's contribution margin by its share of the units you sell, and use that average.
If 60% of your units contribute $30 and 40% contribute $10, the weighted margin is $22, and $11,000 of fixed costs needs 500 total units — 300 of the first and 200 of the second. The calculator does this and splits the answer back out by line.
Two things to hold onto. First, the answer only holds while the mix holds. Sell the same total units but shift toward the cheaper item and your break-even rises with nothing else having changed, which is why a business can miss its numbers in a month where sales looked fine.
Second, a blended figure can hide a line that is barely pulling its weight. If one product contributes $30 and another $10, the average flatters the second. It is worth running each line on its own — using its share of fixed costs — to see which ones are genuinely carrying the business and which are being subsidised.
What break-even analysis does not tell you
- Cash timing. The most important omission. You can be comfortably above break-even and still run out of money if customers pay in ninety days and suppliers want thirty.
- Volume-dependent costs. It assumes price and unit cost are flat at every level. Real suppliers discount at scale and real customers demand discounts at scale.
- Step changes. Fixed costs jump when you need another member of staff or another site. The model draws a straight line through what is actually a staircase.
- Whether the volume is achievable. It tells you the number you need. It has no opinion on whether your market will supply it.
- Tax. The target-profit tab works in pre-tax profit. If you want a figure after tax, gross it up before entering it.
Frequently asked questions
How do I calculate my break-even point?
Divide your fixed costs by the contribution margin, which is your selling price minus the variable cost of making one unit. With $15,000 of monthly fixed costs, a $75 price and $30 of variable cost, each sale contributes $45, so you need $15,000 divided by $45, or 334 units a month. In revenue terms that is $25,000, which you can also get by dividing fixed costs by the contribution margin ratio of 60%.
What counts as a fixed cost and what counts as variable?
Fixed costs stay the same whether you sell one unit or a thousand: rent, salaried staff, insurance, software subscriptions. Variable costs move with each sale: materials, packaging, payment processing fees, shipping, hourly labour tied to production. The tricky ones sit in between. A salesperson on commission is variable, on salary is fixed. Utilities are usually mostly fixed with a small variable element. When genuinely unsure, treat it as fixed, since that gives you the more cautious break-even.
Why does the calculator round up?
Because a partial unit does not pay any bills. If the arithmetic says 2,769.23 units, then selling 2,769 leaves you $1.50 short of covering your fixed costs, so you have not actually broken even. The exact figure is shown alongside because it is what feeds the revenue and margin-of-safety numbers correctly, but the whole units are the answer to what you have to sell.
What is a good margin of safety?
It measures how far your expected sales sit above break-even before you start losing money, and more is better. A common rule of thumb treats above 20% as comfortable and below 10% as uncomfortably tight, though the right level depends on how predictable your sales are. A business with contracted recurring revenue can live with a thin margin; one dependent on seasonal footfall cannot. If your margin of safety is negative, the plan loses money at the volume you are forecasting.
How does break-even work with more than one product?
You use a weighted average contribution margin based on your sales mix. If 60% of units sold are a product contributing $30 and 40% contribute $10, the blended figure is $22, and fixed costs divided by $22 gives total units. Splitting that back out by the same mix tells you how many of each. The catch is that the answer only holds while the mix holds: shifting toward lower-margin items raises your break-even without anything else changing.
What does break-even analysis not tell me?
It assumes your price and your per-unit costs stay constant at every volume, which is rarely true — suppliers give discounts at scale, and fixed costs jump in steps when you need another oven or another warehouse. It also says nothing about cash timing. A business can be above break-even on paper and still run out of money if customers pay in ninety days while suppliers want thirty. Treat it as a floor test for a price and cost structure, not as a forecast.
These results are estimates for general information only and are not financial, accounting or business advice. Break-even analysis assumes constant selling prices, constant per-unit variable costs and a fixed cost base that does not change with volume, none of which holds precisely in practice. It also ignores cash-flow timing, which can make a profitable business insolvent. Confirm any figure against your own management accounts, and speak to a qualified accountant before making commercial decisions.