Stepwise.

Break-Even Calculator

Work out how many units you must sell to cover your fixed costs, the revenue that represents, and the margin of safety on your sales target.

How to use this calculator

  1. 1Add up your fixed costs for a period — a year is usual. Rent, salaries, insurance, subscriptions.
  2. 2Enter what you charge per unit and what each unit costs you to deliver.
  3. 3Optionally set a profit target and your expected sales to see the margin of safety.

How the calculation works

Break-even units = Fixed costs / (Price − Variable cost)
Fixed costs
Costs that do not vary with volume, over one period
Price
Revenue per unit sold
Variable cost
Cost incurred for each unit sold

Price − variable cost is the contribution margin: the amount each sale contributes to covering fixed costs.

To hit a profit target, add it to fixed costs: units = (fixed costs + target profit) ÷ contribution.

If the contribution is zero or negative there is no break-even point — selling more increases the loss.

Worked example

$50,000 fixed costs, $40 price, $15 variable cost

  1. 1.Contribution per unit is 40 − 15 = $25.
  2. 2.Break-even units = 50,000 ÷ 25 = 2,000 units.
  3. 3.That is 2,000 × $40 = $80,000 of revenue.
  4. 4.The contribution margin is 25 ÷ 40 = 62.5%, so 62.5 cents of every sales dollar goes toward fixed costs and then profit.

Result: 2,000 units, or $80,000 in revenue

What break-even analysis actually answers

Break-even analysis answers a single, practical question: how much does a business have to sell before it stops losing money? Below the break-even point, every sale still leaves a net loss because the business has not yet covered its fixed running costs; above it, every additional sale is close to pure profit, since the fixed costs are already paid for. It is one of the first calculations worth running for a new business, product line or project, because it turns a vague ambition — "get more sales" — into a specific, checkable target, like "get to 2,000 units."

Fixed costs versus variable costs

The whole calculation rests on being able to sort every cost into one of two buckets.

  • Fixed costs — expenses that stay roughly the same no matter how much is sold — rent, salaried staff, insurance, loan repayments, software subscriptions. They still have to be paid even in a month with zero sales.
  • Variable costs — expenses triggered by each individual sale — raw materials, packaging, shipping, payment processing fees, sales commissions. Sell nothing and they cost nothing.
  • Semi-variable costs — a mix of the two, like a phone or utility plan with a base fee plus usage charges, which need to be split into their fixed and variable pieces before they can be used in the formula.

Contribution margin — the engine behind the number

Every unit sold contributes a fixed amount toward the pile of fixed costs waiting to be paid off — its price minus its variable cost, known as the contribution margin. Break-even is simply the point where enough of those contributions have stacked up to exactly cancel out the fixed costs. A higher contribution margin per unit means fewer sales are needed to get there, which is why raising the price or cutting the variable cost has such an outsized effect on the break-even point compared with an equivalent cut to fixed costs.

How businesses actually use break-even analysis

Beyond the one-off "when do I turn a profit" question, the same calculation gets reused throughout a business’s life.

  1. 1Deciding whether to launch — comparing the break-even volume against a realistic sales forecast before committing money to a new product or location.
  2. 2Setting a price — testing how different prices move the break-even point, since even a small price change shifts the contribution margin — and the volume needed — disproportionately.
  3. 3Evaluating a cost change — checking whether a new hire, a rent increase, or a cheaper supplier moves the break-even point enough to matter.
  4. 4Judging the margin of safety — comparing expected sales against the break-even point to see how much room there is before a downturn turns a profit into a loss.

Where the simple break-even model breaks down

The classic formula assumes a single product with a constant price and constant unit cost at every volume, which is rarely exactly true. A business selling several products needs a weighted-average contribution margin across the whole mix, or the number ends up hiding which lines are actually profitable. And because fixed costs are only fixed within a range — a second location or an extra shift eventually forces a step up — the analysis really only holds within the volume band it was built around, not indefinitely in either direction.

What this assumes, and where it stops

Assumptions

  • Price and variable cost per unit are constant at every volume — no bulk discounts given or received.
  • Fixed costs stay fixed across the entire range considered. In reality they step up (a second warehouse, another hire).
  • Everything produced is sold, with no inventory build-up.
  • A single product, or a stable mix of products with the same contribution margin.

Limitations

  • Multi-product businesses need a weighted average contribution margin; a single figure hides which lines are subsidising others.
  • Ignores timing — break-even says nothing about whether you have the cash to reach it.
  • Semi-variable costs (a base fee plus usage) have to be split manually into their fixed and variable parts.

Common questions

What counts as a fixed versus a variable cost?

Fixed costs are incurred whether you sell one unit or ten thousand: rent, salaried staff, insurance, software licences. Variable costs are triggered by the sale: materials, packaging, shipping, payment processing, sales commission. Costs with both components — a phone plan with a base fee plus per-minute charges — should be split.

What is the margin of safety?

The gap between your expected sales and your break-even point, as a percentage of expected sales. A 40% margin of safety means sales could fall by 40% before you start losing money. Below about 20% is generally considered fragile.

How do I reach break-even faster?

Three levers, in order of typical impact: raise the price, cut the variable cost, cut fixed costs. A price rise flows entirely into contribution, so a 10% price increase usually reduces the break-even volume far more than a 10% cost saving.

Sources

Formula and content last reviewed on .

Results are estimates for information only, not professional advice.

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