The break-even point calculator tells you when your business stops just covering costs and finally turns a profit. If you’ve ever stared at a spreadsheet, willing the numbers to flip from red to green, this is the page for you. It’s a straightforward question: how many items must you sell to pay every last expense—rent, materials, wages—before any money lands in your pocket as profit?
What the break-even point actually means
The break-even point is the point where total revenue equals total costs. Sell above it and every extra unit adds straight to profit. Sell below it and every unit still leaves you worse off than before. It’s one number, but it decides whether you’re running a hobby or building something that can stand on its own.
The formula is simple: fixed costs divided by the difference between price per unit and variable cost per unit. Fixed costs stay the same no matter how much you sell—think rent or a business loan repayment. Variable costs change with each sale—packaging, postage, or the milk in that flat white. Price is what the customer hands over. Subtract the variable cost from the price, then divide the fixed costs by that result to find the break-even units.
A café sells a flat white for £2.80. Their rent and loan payments add up to £1,200 a month. Each cup uses £0.45 of milk, £0.25 of coffee, and £0.10 of disposable cup, so variable cost is £0.80. Fixed cost £1,200 divided by (£2.80 minus £0.80) equals 600 cups. Sell 600 flat whites and the café breaks even; sell one more and the money starts stacking up.
The definition slips when fixed and variable costs get mixed up. A part-time barista paid hourly is variable, but a salaried manager is fixed. Some costs sit in the middle—like a phone plan with a fixed line rental plus usage charges. Bulk discounts from suppliers can make variable costs drop as you buy more, so the simple formula won’t fit. Always double-check how you’ve grouped your costs before you trust the result.
How to work it out with a pencil and paper
- Enter your total fixed costs (rent, salaries, equipment).
- Enter the price you sell each unit for.
- Enter the variable cost to make or buy each unit.
- See the units and revenue you need to break even.
Break-even units = Fixed costs ÷ (Price − Variable cost per unit)Break-Even Comparison: Fixed vs Variable Costs
| Cost Type | Fixed Cost Example | Variable Cost Example |
|---|---|---|
| Rent | $3,000/month | $0 |
| Utilities | $500/month | $2/unit |
| Raw Materials | $0 | $10/unit |
| Labor | $2,500/month | $15/hour |
| Marketing | $1,000/month | $5/lead |
Where things go wrong in real businesses
A café owner took out a £25,000 loan to open a new shop, assuming 400 customers a week would cover the payments. By the third month, the till was in the red every Friday. The real break-even was 650 customers a week, and every week below that dug the hole deeper. The business folded before the fourth quarter. That’s the hard truth: get the break-even wrong and you bleed cash while telling yourself you’re ‘almost there.’
Once you know your break-even, pricing and marketing decisions become precise. A £0.10 price rise might only need a handful of extra customers to keep profit steady. A discount voucher could be worth it only if the extra sales push you past the break-even line. It turns hunches into moves you can measure.
Three worked cases you can copy
Home bakery selling sourdough loaves
Each loaf sells for £4.20. Fixed costs are £350 a month for a market stall. Ingredients, packaging, and fuel add £1.70 per loaf. The margin is £4.20 minus £1.70, which is £2.50. Divide £350 by £2.50 and you get 140 loaves. Sell 140 loaves and the stall breaks even; every extra loaf is pure profit.
Bespoke furniture with odd batch sizes
A joiner charges £850 for a bespoke table. Fixed costs are £2,400 a quarter. Variable costs jump: £120 for timber, £45 for fittings, £30 for varnish, and £25 for fuel to deliver—total £220 per table. Margin is £850 minus £220, which is £630. Divide £2,400 by £630 and you get 3.81 tables. You can’t sell 0.81 of a table, so you round up to 4. The joiner must finish four tables to cover costs.
The errors that cost real money
| Common mistake | What to do instead |
|---|---|
| Counting every staff wage as fixed cost | Hourly wages tied to hours worked are variable; salaried staff on fixed hours are fixed. If you pay £12 an hour and work 80 hours a month, that’s £960 of variable cost, not fixed overhead. |
| Forgetting to include VAT in the price | If your listed price is £100 plus 20% VAT, the real revenue per sale is £83.33. Use that net figure in the formula, or you’ll think you’ve broken even when HMRC still wants its share. |
| Mixing up units—thinking in pounds instead of units | A £500 profit on £10,000 of sales is not the same as breaking even. Use the number of items sold, not the cash in the till, to decide if you’ve crossed the line. |
Use our free break-even calculator
| Tool | What it does |
|---|---|
| Break-Even Calculator | Find how many units you must sell to cover all your costs — the point where profit begins. |
Try the Break-Even Calculator
Skip the manual maths — enter your numbers and get the answer instantly.
Open the Break-Even Calculator →One last check before you trust the number
Small differences in interest rate, term or timing can add up to large sums over the years. Before committing to any financial decision, run a few different scenarios so you can see the full picture and choose with confidence.
The three things to remember
- Write every cost—fixed or variable—on one list before you start the maths.
- Round up the break-even result to the next whole unit; you can’t sell a fraction.
- Re-run the calculation every time a price, cost, or volume changes.
常见问题
What are fixed vs variable costs?
Fixed costs stay the same no matter how much you sell (rent, salaries, insurance). Variable costs rise with each unit (materials, packaging, shipping).
What is contribution margin?
It is the selling price minus the variable cost per unit — the amount each sale contributes toward covering fixed costs and then profit.
What if price is below variable cost?
Then you lose money on every sale and can never break even. You must raise the price or cut the variable cost first.
