What the Break-Even Point Calculator does
This break-even calculator tells you how many units you must sell, and how much revenue that is, before a product or business covers its fixed costs - from three numbers: fixed costs for the period, the selling price per unit and the variable cost per unit. It adds the contribution margin, the volume needed for a target profit, the margin of safety at your expected sales and a cost-volume-profit chart.
It is the classic cost-volume-profit (CVP) model taught in management accounting: straight-line revenue and costs, one product or an average product, one period. That simplicity is the point - it shows quickly whether a plan is anywhere near viable and which lever, price or cost, matters most.
How to use it
- Enter fixed costs for a period you choose - a month, a quarter, a launch. Everything else must use the same period.
- Enter the selling price and the variable cost of one unit, both excluding sales tax if you do not keep the tax.
- Optionally add a target profit and the sales you expect. The margin of safety and profit at that volume appear.
- Read the break-even units and revenue, look at where the revenue and total cost lines cross on the chart, and check the price sensitivity note before settling on a price.
Reading the results
Contribution per unit is what each sale leaves over after its own costs; it is what pays the fixed costs. Break-even is simply fixed costs divided by contribution.
The margin of safety is how far expected sales could fall before you make a loss. 25% means sales could drop by a quarter and you would still break even.
Operating leverage shows how sharply profit reacts to sales near break-even. At 4x, a 10% rise in sales lifts profit by about 40% - and a 10% fall cuts it by as much.
Worked example: a catering cart with 12,000 of monthly fixed costs
A small catering business has fixed costs of 12,000 a month. Each order sells for 50 and costs 30 in food, packaging and card fees, so contribution is 20 per order and the contribution margin ratio is 20 / 50 = 40%.
Break-even is 12,000 / 20 = 600 orders a month, or 600 x 50 = 30,000 of sales. To make 8,000 of profit it needs (12,000 + 8,000) / 20 = 1,000 orders.
If it expects 800 orders, profit is 800 x 20 - 12,000 = 4,000, and the margin of safety is (800 - 600) / 800 = 25%. Operating leverage is 16,000 / 4,000 = 4. Raising the price by 10% to 55 lifts contribution to 25 and cuts break-even to 480 orders; cutting it by 10% to 45 raises break-even to 800.
Formulas and scoring rules
- Contribution per unit
CM = price - variable cost- Contribution margin ratio
CM ratio = CM / price- Break-even units
Q = fixed costs / CMThe headline rounds up to a whole unit because you cannot sell part of one.- Break-even revenue
revenue = Q x price = fixed costs / CM ratio- Units for a target profit
Q_target = (fixed costs + target profit) / CM- Margin of safety
MoS = (expected units - Q) / expected units- Operating leverage
DOL = (expected units x CM) / profit at expected units
Getting fixed and variable costs right
Most errors come from classification. A cost is variable if it rises with each unit sold: materials, packaging, shipping you pay, payment processing fees, sales commission, marketplace fees. It is fixed if it stays the same across the range of volumes you are considering: rent, salaries, subscriptions, insurance, loan repayments.
Some costs are step costs - fixed until you need a second machine or another employee. If your expected volume crosses such a step, run the calculation twice, once for each cost level, and see which range your sales fall into.
Limitations: what the result does not prove
- It assumes price and variable cost per unit stay constant at every volume. Discounts, bulk purchasing and overtime break that assumption.
- With several products, it needs a weighted-average price and variable cost based on your sales mix; if the mix changes, the break-even point moves.
- It works in accounting profit for one period. It ignores taxes, financing, cash timing and the investment needed to start, which a cash-flow or payback analysis would cover.
- Break-even is not a target. It is the point where you stop losing money, before any return for the owner's time or capital.
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Standards and sources
Frequently asked questions
What is the break-even point formula?
Break-even units equal fixed costs divided by contribution per unit, where contribution is selling price minus variable cost per unit. For revenue, divide fixed costs by the contribution margin ratio. With fixed costs of 12,000, a price of 50 and variable cost of 30, it is 600 units or 30,000 of revenue.
What if my variable cost is higher than my price?
Then each sale loses money and there is no break-even point: selling more only makes the loss bigger. The calculator says so instead of giving a number. Raise the price, cut the unit cost, or rethink the product.
How do I calculate break-even for several products?
Work out a weighted-average contribution per unit using your expected sales mix, then divide fixed costs by it. If you sell three A for every one B, weight A's contribution by 75% and B's by 25%. Enter the weighted price and variable cost here.
What is a good margin of safety?
There is no single threshold, but a small margin means a modest sales shortfall turns profit into loss. Businesses with volatile or seasonal demand usually want a bigger cushion. Compare it with how much your sales have actually varied in the past.
Should sales tax or VAT be included in the price?
No, if you collect it for the tax authority - use the net price you keep. Include only the revenue that is yours, and treat taxes you cannot reclaim on purchases as part of variable or fixed costs as appropriate.
How does break-even help set a price?
It shows how many sales each price requires. The page reports break-even at 10% above and below your price; if a small price rise cuts the volume you need sharply, and customers are not very price sensitive, a higher price may be the safer plan.
Last reviewed by the A2Z.Tools team against the sources listed above.
