What it means
Every business carries two kinds of cost. Fixed costs stay the same whatever you sell: rent, salaries, insurance, software subscriptions, loan interest.
Variable costs rise and fall with each unit: materials, packaging, payment processing fees, delivery. The difference between a unit's selling price and its variable cost is the contribution margin, the amount each sale contributes towards covering fixed costs.
Break-even analysis asks a simple question: how many contributions do we need before the fixed costs are paid for? The answer tells you far more than a single number.
It shows how much room there is between expected sales and disaster (the margin of safety). It shows how sensitive profit is to price: a 5% price cut on a thin-margin product can push the break-even point up by a third.
It shows the consequences of turning variable costs into fixed ones, for instance by hiring staff instead of using contractors. And it lets you test decisions before committing money: if a new shop needs 220 customers a day to break even and the location sees 150 walking past, the answer is clear.
The analysis also has limits. It assumes costs split neatly into fixed and variable, that variable cost per unit is constant and that everything produced is sold at one price.
Real businesses have step costs (a second machine at 10,000 units), volume discounts and mixed product ranges. Multi-product break-even uses a weighted average contribution margin, which is only as good as the assumed sales mix.
Treat break-even as a way of thinking, refined with scenarios, rather than a precise prediction.
In practice
Real-world examples.
Example
A freelance designer with $2,500 of monthly fixed costs and an hourly rate of $75 needs about 34 billable hours a month before earning anything for themselves.
Example
A software company with $400,000 of annual fixed costs and a 90% contribution margin ratio breaks even at about $444,000 of revenue; the high margin means each extra sale is almost pure profit once past that point.
Example
A manufacturer deciding whether to buy a $200,000 machine that cuts variable cost per unit from $12 to $9 calculates that the saving of $3 per unit pays for the machine at 66,667 units, and only buys if forecast volume comfortably exceeds that.
Think of it
“Break-even analysis is like figuring out how many lemonades you need to sell to pay for the stand and ingredients. Sales beyond that are profit.
Formula
Calculation
Break-even point (units) = Fixed Costs / (Selling Price per unit minus Variable Cost per unit)
Break-even point (revenue) = Fixed Costs / Contribution Margin Ratio, where the contribution margin ratio is (Price minus Variable Cost) / Price
Worked example. A coffee cart owner is deciding whether to take a pitch at a train station.
- Pitch fee, insurance and equipment lease: $3,600 per month (fixed)
- Wages for one barista: $2,400 per month (fixed)
- Total fixed costs: $6,000 per month
- Average price per drink: $4.50
- Cup, coffee, milk and card fee per drink: $1.50 (variable)
Contribution per drink = $4.50 minus $1.50 = $3.00
Break-even = $6,000 / $3.00 = 2,000 drinks per month
The station is open 26 days a month, so the cart must sell 77 drinks a day to break even. If the owner expects 120 drinks a day (3,120 a month), the margin of safety is 1,120 drinks, or 36% of expected sales, and monthly profit would be 1,120 x $3.00 = $3,360. If a rival cart forces the price down to $4.00, contribution falls to $2.50 and break-even rises to 2,400 drinks, or 92 a day.Case study
Seen in the real world.
A husband-and-wife bakery wanted to open a second site in a shopping centre. The rent was double their current site, but footfall was far higher. Their break-even analysis showed fixed costs of $14,000 a month against an average contribution of $3.20 per item, so they needed 4,375 sales a month, about 168 a day over 26 trading days.
The centre's own data suggested comparable food outlets served 250 to 300 customers a day, and their first site averaged 1.4 items per customer. Expected sales of around 350 items a day gave a margin of safety of over 50%. They signed the lease.
Twelve months later the site was selling 310 items a day, below forecast but still well above break-even, and profitable from the fourth month. The analysis had not predicted sales exactly, but it had shown the decision could survive a big miss.
Watch out
Common mistakes.
- Leaving the owner's own pay out of fixed costs. A business that "breaks even" while paying its founder nothing is losing money.
- Treating semi-variable costs, such as electricity or commission-based pay, as entirely fixed or entirely variable. Split them.
- Forgetting that break-even is a point in time. Costs and prices change, so recalculate whenever they do.
Questions
People also ask.
What is a good margin of safety?
It depends on how volatile sales are, but many operators want expected sales at least 20% to 30% above break-even before committing to new fixed costs.
How does break-even work with several products?
Use the weighted average contribution margin based on the expected sales mix, then convert the total back into units of each product.
Does break-even include profit targets?
The basic version does not, but you can add a required profit to fixed costs to find the sales needed to hit that target.
From the founder's library
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