Break-Even Point Calculator
Costs stop winning at one exact number of units. Enter three figures and find it.
Use one currency throughout, and set the target profit over the same period as the fixed costs.
What the break-even point actually tells you
Break-even is the sales volume at which total revenue exactly equals total cost. Below it you are funding the business out of savings or credit; above it every additional sale adds real profit. The arithmetic is short — break-even units = fixed costs / (price - variable cost per unit) — but the discipline it forces is not. To use it you have to decide, line by line, which of your costs follow sales and which arrive regardless.
That denominator, price minus variable cost, is the contribution margin. It is the single most useful number in small-business accounting: it tells you what each sale contributes towards keeping the lights on, and after the lights are paid for, what each sale is worth to you.
Worked example: a small coffee roastery
You roast and sell 12 oz bags of single-origin coffee. Green beans, bags, labels, shipping and card fees come to 8.50 a bag. Rent on the roasting space, the roaster lease, insurance, your salaried assistant and software add up to 12,000 a month. You sell each bag for 24.
Contribution margin is 24 - 8.50 = 15.50 a bag, a margin ratio of 64.6 percent. Break-even is 12,000 / 15.50 = 774.2, which rounds up to 775 bags a month — about 26 bags a day, and roughly 18,600 in monthly revenue. Under 775 bags you are losing money no matter how busy the roastery feels.
Adding a profit target
Break-even keeps you alive; it does not pay you. Say you want 5,000 of monthly profit. Add it to fixed costs: (12,000 + 5,000) / 15.50 = 1,096.8, so 1,097 bags. That is 322 more bags than break-even, about 11 extra a day. Framed that way, a profit goal becomes a daily operational target rather than an abstraction — and if 11 extra bags a day looks impossible with your current foot traffic, you have learned something before you signed the lease renewal.
Margin of safety
If you currently sell 1,200 bags a month, your margin of safety is (1,200 - 775) / 1,200 = 35 percent. Sales could fall by a third before you dipped into losses. Below about 20 percent the business is fragile — one lost wholesale account or one slow quarter puts you underwater. Margin of safety is the number to watch when deciding whether you can afford a new hire or a bigger space.
A per-cup café example
The same maths works on any unit. A café selling a 4.75 latte with 1.35 of milk, beans, cup and card fee has a 3.40 contribution margin. Against 9,000 of monthly fixed costs, break-even is 2,648 cups a month: about 88 a day open every day, or 102 a day if you close on Sundays. Note how much thinner the margin ratio is here — 72 percent looks healthy, but the low absolute margin per cup means volume has to be high.
Using it for pricing decisions
Break-even analysis is at its most useful when someone asks for a discount. Take 10 percent off the 24 bag and the price is 21.60, but the margin falls from 15.50 to 13.10 — a 15 percent cut in contribution. To end the month with the same total contribution you would need 15.5 / 13.1 = 18 percent more volume. Discounts almost never generate that, which is why price cuts are the fastest way to move a break-even point in the wrong direction.
The reverse holds too. A modest 8 percent price rise on the same product takes the margin to 17.42 and drops break-even to 689 bags, buying you an 86-bag cushion without touching a single cost line. Run both scenarios before you negotiate.
Where the model breaks down
Fixed costs are only fixed within a range. Sell 3,000 bags a month and you need a second roaster, another member of staff and more space — the fixed-cost line steps up and the break-even point jumps with it. Model each capacity band separately rather than extrapolating one line forever.
Multi-product businesses need a weighted approach. Either run this calculator on a representative average unit, or work in revenue terms: break-even revenue = fixed costs / contribution margin ratio, using your blended ratio across the product mix. The blended answer only stays valid while the mix stays roughly the same, so revisit it whenever a product takes off.
Finally, break-even is a profit concept, not a cash one. Inventory bought in advance, customers paying on 60-day terms and loan principal repayments all consume cash without appearing here. A business can pass its break-even point on paper and still run out of money, so pair this with a simple cash-flow forecast before making big commitments.
Sources & further reading
- U.S. Small Business Administration — separating fixed and variable startup costs
- IRS Small Business and Self-Employed Center — how business income and deductible costs are treated
- GOV.UK — the sales and expense records a business must keep
- U.S. Bureau of Labor Statistics — survival rates of new businesses over time
Frequently asked questions
What counts as a fixed cost and what is variable?
Fixed costs stay the same whether you sell one unit or a thousand: rent, insurance, salaried staff, software subscriptions, loan payments. Variable costs only appear when a sale happens — materials, packaging, card processing fees, piece-rate labour, outbound shipping. If the bill arrives whether or not you open the doors, it is fixed. Semi-variable items such as electricity are usually split: the standing charge into fixed, the usage-driven part into variable.
What does contribution margin mean?
Contribution margin is what one sale leaves behind after its own variable costs: price minus variable cost per unit. Every unit contributes that amount towards fixed costs, and once fixed costs are covered the same amount drops straight into profit. The ratio version — margin divided by price — tells you what share of each dollar of revenue is available for overhead and profit.
How do I lower my break-even point?
There are only three levers: raise the price, cut the variable cost per unit, or cut fixed costs. Price moves it fastest because it lifts margin without touching the cost base — with 12,000 fixed and 8.50 variable, going from 24 to 26 drops break-even from 775 units to 686. Cutting fixed costs moves it proportionally, so 10 percent off overhead is 10 percent off the volume. Discounting works in reverse and is brutal: a 10 percent price cut here pushes break-even up to 917 units.
Does this include taxes?
No, this is a pre-tax operating calculation. Sales tax or VAT you collect is not your revenue, so enter prices net of it, and income tax applies only to profit earned above the break-even point. If your target profit is an after-tax figure, gross it up first: divide it by one minus your tax rate, so a 5,000 after-tax goal at a 25 percent rate becomes 6,667 before tax.