A break-even point gives a small business one clear number to test: how much must we sell before revenue covers our costs?
At break-even, the business has paid its fixed and variable costs; it has not made a profit yet, but it has also not made a loss under the figures used.
The math is simple, but the useful work comes first: choosing honest costs, a real selling price, and a unit that fits how the business sells.
Start with three plain terms
You need fixed costs, variable cost per unit, and selling price per unit.
Fixed costs stay much the same within the period, even when sales rise or fall. They may include rent, core salaries, insurance, software, and basic phone or internet costs.
Variable costs rise when you sell more, and they may include materials, packaging, card fees, delivery, sales commission, or paid labour tied to one job.
Contribution is the part of each sale left after its variable cost, so that money first helps pay fixed costs. After fixed costs are covered, more contribution can add to profit.
If you need help sorting a cost, ask a basic question: would this cost change soon if we sold one more unit? Our guide to gross margin for a service business explains the same split in more detail.
Use the break-even formula
For a business that sells one main product or service unit, use this formula:
Break-even units = fixed costs ÷ (selling price per unit − variable cost per unit)
The amount in brackets is the contribution from one unit. Use costs from the same period, so monthly fixed costs lead to a monthly break-even target.
| Input | Example | What it means |
|---|---|---|
| Monthly fixed costs | $6,000 or £6,000 | Costs that must be covered this month. |
| Selling price | $50 or £50 | The normal price of one unit. |
| Variable cost | $20 or £20 | The cost that comes with one unit. |
| Contribution | $30 or £30 | Price minus variable cost. |
In this example, divide 6,000 by 30, which gives a break-even point of 200 units for the month.
Round up when the answer is not a whole unit because most firms cannot sell half a project or part of a visit.
Choose a unit that matches the business
A shop may use one item, a café may use one average order, a studio may use one project, and a consultant may use one billable hour or one monthly plan.
For a service firm, direct labour, travel, a freelancer, or job software may form part of the variable cost, while core staff pay may be fixed in the short term. The right choice depends on how that cost behaves in your business.
Say an agency has monthly fixed costs of $9,000 or £9,000, while its average project sells for $1,500 or £1,500 with $300 or £300 in direct job costs. Each project gives a contribution of 1,200; divide 9,000 by 1,200 to get 7.5, so the agency needs eight average projects to pass break-even.
That result is only sound if the “average project” is real. Check recent invoices and direct costs instead of using the nicest month.
Find break-even sales revenue
Some firms sell many items at different prices. A sales value can be easier to use than one unit target.
First find the contribution margin ratio, which is contribution divided by sales. If a business keeps 60 cents or 60 pence from each sales dollar or pound after variable costs, its ratio is 60%.
Then use this formula:
Break-even sales = fixed costs ÷ contribution margin ratio
With fixed costs of 6,000 and a ratio of 60%, break-even sales are 10,000. The units can vary, but the mix must still produce about the same margin.
When the mix changes, the target changes too, because more low-margin work means the business must make more sales to cover the same fixed costs.
Test price, cost, and sales volume
A break-even model is most useful when you change one input and see what happens.
- A higher price: contribution per sale may rise, so fewer sales may be needed. Check likely demand before you assume volume will stay the same.
- A higher direct cost: contribution falls, so the break-even target rises unless price or the sales mix changes.
- A new fixed cost: a lease, salary, or tool raises the amount the business must cover each month.
This is why a price choice should not start with a round number alone. Read the result beside your simple sales forecast. If the forecast is below break-even, the plan needs another look.
A small price change can have a large effect, but it is not free money. Our guide to planning a price increase covers the customer side of that decision.
Add a margin of safety
Break-even is the edge, not a comfortable goal. A margin of safety shows how far expected sales sit above break-even sales.
If monthly break-even sales are 10,000 and the forecast is 13,000, the cash value of the safety margin is 3,000. This gives room for a slow week or a small cost rise, but it does not remove risk.
Be careful with thin margins, since one return, late project, or supplier increase can move the result. Use a cautious sales case as well as the main plan.
Know what the figure leaves out
Break-even analysis assumes that price, unit cost, and the sales mix stay close to the figures you entered, although real firms are less tidy.
The result may not show tax timing, loan payments, stock bought before a sale, unpaid invoices, or a large annual bill. It also says little about when money reaches the bank.
That is why break-even does not replace a four-week cash-flow forecast. Break-even asks whether revenue can cover costs, while the cash forecast asks whether money will arrive before bills are due.
Use qualified accounting or financial advice for a choice that affects tax, debt, funding, or the long-term health of the company.
Update the number when the business changes
Review the calculation each month or quarter, and whenever a price, wage, supplier cost, product mix, or fixed contract changes.
Keep the old version beside the new one, since the gap can show what moved: price, cost, or sales mix. That is more useful than treating one number as a permanent target.
Put the result into the small-business budget, compare it with the sales forecast, and check the cash timing. Together, those three views give a clearer picture than any one formula.
Frequently asked questions
What is the break-even formula?
Divide fixed costs by the selling price per unit minus the variable cost per unit. The result is the number of units you need to sell to cover those costs.
How do service businesses calculate break-even?
Use a service unit such as one billable hour, project, visit, or monthly plan. Subtract the direct cost of that unit from its price, then divide fixed costs by the result.
Is break-even the same as a cash-flow forecast?
No; break-even compares revenue with costs, while a cash-flow forecast also tracks when money reaches and leaves the bank account.