How to calculate the break-even point in units
Your break-even point is the number of sales where total revenue exactly equals total cost — no profit, no loss. The formula is:
Break-even units = Fixed costs ÷ (Price − Variable cost per unit)
That denominator is your contribution margin — the profit each sale contributes toward covering your fixed costs. Sell one unit above the break-even point and that whole margin drops to the bottom line.
How to calculate break-even in sales dollars
Most businesses also want the break-even point in money, not just unit count — especially service businesses that don't sell discrete "units". For that you use the contribution margin ratio:
Contribution margin ratio = (Price − Variable cost) ÷ Price
Break-even in dollars = Fixed costs ÷ Contribution margin ratio
Both routes give the same answer. With $5,000 fixed costs, a $40 price and $15 unit cost, the margin is $25 and the ratio is 25 ÷ 40 = 62.5%. So break-even is 5,000 ÷ 25 = 200 units, or 5,000 ÷ 0.625 = $8,000 in sales. The calculator above shows both figures at once.
Worked example: the three levers
If your break-even looks impossibly high, only three things can move it. Starting from the $8,000 example above:
| Change | New margin | Break-even units |
|---|---|---|
| Baseline — $40 price, $15 cost, $5,000 fixed | $25 | 200 |
| Raise price 10% → $44 | $29 | 173 (−14%) |
| Cut unit cost 10% → $13.50 | $26.50 | 189 (−6%) |
| Cut fixed costs 10% → $4,500 | $25 | 180 (−10%) |
Price is almost always the strongest lever, because it widens the margin without touching your cost base. That is why a small price rise beats a bigger cost cut in most businesses.
Break-even for a service business
If you sell hours rather than products — a salon, agency, consultancy or trade — treat one billable hour or one appointment as the "unit". Your price is the hourly rate or average ticket; your variable cost is whatever that specific job consumes (products used, contractor pay, card fees). Rent, salaried staff and software stay in fixed costs. The dollars formula above is usually the more natural one here.
Margin of safety
Break-even tells you the floor; the margin of safety tells you how much room you have above it: (Actual sales − Break-even sales) ÷ Actual sales. If you're breaking even at $8,000 and currently sell $10,000, your margin of safety is 20% — sales could fall a fifth before you start losing money. Under about 10% is generally considered fragile.
Reaching profit, not just break-even
To hit a profit target, add it to fixed costs: Units = (Fixed costs + Target profit) ÷ contribution margin. Enter a target above to see the sales you'd need to actually take money home.
What break-even analysis assumes
The model treats price and variable cost as constant at every volume. In reality you may get bulk discounts on materials (lowering unit cost as you grow) or need to discount to sell more (lowering price). Fixed costs also "step" — hire a second employee and they jump. Treat the result as a planning benchmark, and recalculate whenever price, costs or overheads change.
How do I calculate the break-even point in dollars?
Divide fixed costs by the contribution margin ratio: Fixed costs ÷ ((Price − Variable cost) ÷ Price). With $5,000 fixed costs and a 62.5% ratio, break-even is $8,000 in sales. The calculator shows this as "Break-even point in dollars".
What is the break-even formula in units?
Fixed costs ÷ (Price per unit − Variable cost per unit). The denominator is the contribution margin — the profit each individual sale adds toward your fixed costs.
What if price is below cost per unit?
Then every sale loses money and you can never break even, no matter the volume. The calculator shows ∞ and warns you — you must price above your variable unit cost first.
Are fixed costs monthly or one-off?
Use the period you want to plan for — monthly is most common. Keep price, unit cost and fixed costs on the same time basis, or the answer will be meaningless.
What's the difference between contribution margin and profit margin?
Contribution margin only subtracts variable costs, so it shows what each sale contributes toward fixed costs. Profit margin subtracts everything, including overheads. Contribution margin is always the larger number.
How many units do I need to sell for a specific profit?
Add the profit to your fixed costs before dividing: (Fixed costs + Target profit) ÷ contribution margin. Enter a target monthly profit in the calculator and it works this out for you.