Identify the exact sales volume and revenue threshold required to cover your operational costs.
| Sales Volume | Units Sold | Total Revenue | Total Costs | Net Profit / Loss |
|---|
A bakery owner planning to add a new sourdough line has already leased a proofing oven for $600 a month and budgeted $200 a month for a part-time baker's hours dedicated to the product. Flour, yeast, and packaging run about $1.20 per loaf. She's pricing the loaves at $6.00 each. Before she commits, she needs one number: how many loaves does she have to sell every month just to cover the oven and labor cost, before a single dollar counts as profit?
That's break-even analysis. It splits your costs into two buckets — fixed costs, which don't change no matter how many units you sell (rent, equipment leases, salaried staff), and variable costs, which scale with each unit sold (materials, packaging, per-unit shipping). The gap between your selling price and your variable cost per unit is your contribution margin — the amount each sale actually contributes toward covering fixed costs. Once enough units have been sold to cover those fixed costs, every additional sale is profit.
I've noticed a lot of first-time founders treat "break-even" and "profitable" as the same thing. They're not. Hitting break-even means you've stopped losing money on the product. It says nothing about whether the price, volume, or margin actually supports a healthy business — that's a separate question this tool doesn't answer, and no calculator honestly can.
Here's what's covered below: how the calculator processes your three inputs, the exact formula with a full worked example, six real scenarios where this matters, practical tips for using the output correctly, and answers to the questions people usually have about break-even math.
You enter three numbers: fixed costs (a monthly or one-time total), variable cost per unit, and selling price per unit. The tool runs three calculations in sequence. First, it subtracts variable cost from price to get your contribution margin per unit. Second, it divides that contribution margin by price to get the contribution margin ratio, expressed as a percentage. Third, it divides your total fixed costs by the contribution margin to get the number of units you need to sell to break even, then multiplies that by price to show break-even revenue.
Contribution Margin = Price per Unit - Variable Cost per Unit
Contribution Margin Ratio = Contribution Margin / Price per Unit
Break-Even Units = Fixed Costs / Contribution Margin
Break-Even Revenue = Break-Even Units * Price per UnitLet's run a worked example. Suppose fixed costs are $60,000, the selling price is $100 per unit, and the variable cost is $60 per unit.
Contribution Margin: $100 − $60 = $40
Contribution Margin Ratio: $40 / $100 = 40%
Break-Even Units: $60,000 / $40 = 1,500 units
Break-Even Revenue: 1,500 * $100 = $150,000
You can check that last figure a second way: Fixed Costs / Contribution Margin Ratio = $60,000 / 0.40 = $150,000. Same answer, confirming the math holds together.
One honest limitation: this model assumes fixed costs stay fixed and variable cost per unit stays constant at any volume. In reality, costs often step up in chunks — you might need a second oven, a second warehouse shift, or a volume discount kicks in on materials. Those are called step-fixed costs, and this simple model doesn't account for them automatically. Re-run the numbers whenever your cost structure changes meaningfully.
Product Launch Pricing: The bakery owner from the intro enters her numbers — $800 in combined fixed costs, $1.20 variable cost, $6.00 price. Contribution margin is $4.80, and break-even units come out to 167 loaves a month, or about 6 a day. Seeing that number laid out, she decides the price holds up against her local competition and moves forward with the launch.
SaaS Subscriber Targets: A two-person software startup has $8,000 a month in server and support-tooling costs, charges $49 a month per subscriber, and estimates $9 a month in variable support cost per active user. Contribution margin is $40, so they need exactly 200 paying subscribers to cover their fixed costs before any revenue becomes profit — a number they now track weekly against actual signups.
Freelance Overhead Coverage: A freelance consultant has $4,500 a month in fixed overhead (software subscriptions, coworking desk, insurance), bills clients $85 an hour, and estimates $10 an hour in variable costs from subcontracted work. That puts break-even at 60 billable hours a month — a useful number to watch against actual utilization, though it doesn't say anything about how sustainable that hour count is long-term.
New Production Line Evaluation: A manufacturer is weighing whether to add a line with $25,000 a month in amortized equipment and setup costs, selling at $45 per unit with $27 in variable cost per unit. Contribution margin is $18, giving a break-even of 1,388.9 units — rounded up to 1,389, since you can't sell a fraction of a unit. Comparing that to their existing order pipeline, they greenlight the line.
Event Ticket Pricing: A conference organizer has locked in a $3,200 venue rental and estimates $15 per attendee in catering and materials. At a $45 ticket price, contribution margin is $30, and break-even lands at 106.67 attendees — 107 once rounded. Whether that's achievable depends entirely on their marketing reach, which the calculator has no way of predicting.
Classroom Business Modeling: A student team in a business plan competition uses the tool to model a hypothetical food truck, testing how break-even units shift if they raise the price by a dollar or negotiate a cheaper ingredient supplier. What number would you expect if they cut variable cost by just $2 per unit?
Classify your costs carefully before entering anything. A cost that feels "fixed" — like a part-time employee's hours — can actually behave like a variable cost if you scale their hours with order volume. Misclassifying even one line item throws off the entire break-even figure.
Don't treat break-even units as a target to celebrate. It's a floor, not a goal. A business that only ever hits break-even has no cushion for a slow month, an unexpected expense, or a chance to reinvest in growth.
Watch for step-fixed costs at higher volumes. If your break-even calculation assumes your current equipment and staffing, but hitting that volume actually requires a second shift or a bigger lease, rerun the numbers with the new fixed-cost figure before committing to a plan.
Combine this tool with our Markup Calculator when you're still deciding on a price rather than treating it as fixed — see how different markup percentages change your break-even volume before you lock in a number.
Re-run this calculation any time a supplier changes pricing, rent increases, or you add a new fixed cost like a software subscription. Break-even isn't a one-time number; it shifts every time your cost structure does.
Straightforward arithmetic division and subtraction — no iterative or approximation methods are needed since break-even math resolves in a single closed-form step.
The full calculation, including the reverse-check against the contribution margin ratio, completes in under 1 millisecond in any modern browser, with no server round-trip required.
All figures you enter — fixed costs, price, and variable cost — stay in your browser's memory for the duration of your session and are never transmitted anywhere.
Works on all current versions of Chrome, Firefox, Safari, and Edge, including mobile browsers on iOS and Android.
| Metric | This Tool | Spreadsheet Formula | Accounting Software |
|---|---|---|---|
| Setup time | None | Manual formula entry | Account setup required |
| Execution | Instant, client-side | Depends on formula correctness | Server-side |
| Cost | Free | Free | Often subscription-based |
| Step-fixed cost handling | Manual re-entry | Manual | Sometimes automated |
Contribution margin subtracts only variable costs from price, leaving fixed costs out of the calculation entirely. Gross margin, used in accounting, typically subtracts cost of goods sold (which can include some allocated fixed costs like factory overhead) from revenue. They answer different questions and shouldn't be used interchangeably.
Either works, as long as you're consistent — if fixed costs are monthly, your break-even units figure represents units per month. If you enter a one-time fixed cost like initial equipment purchase, your break-even units represent the total needed to recoup that investment, with no time frame implied.
Then your contribution margin is negative, and you cannot break even at any volume — selling more units loses more money, not less. This usually means the price needs to increase, the variable cost needs to come down, or the product isn't viable as currently structured.
No. Break-even analysis operates on revenue and cost before tax. Once you're past break-even and generating profit, that profit will still be subject to whatever business tax obligations apply to you.
Because you can't physically sell 106.67 tickets or 1,388.9 units. Rounding down would leave you short of actually covering your fixed costs, so the convention is always to round break-even unit figures up to the next whole unit.
Markup Calculator — Calculates your selling price from cost and a target markup percentage — useful before you've locked in a price to test how different markups shift your break-even volume.
Margin Calculator — Shows your profit margin as a percentage of price rather than cost — helpful for comparing profitability across products once you already know your break-even point.
Percentage Change Calculator — Tracks how your revenue or unit sales are trending period over period — pairs well with break-even analysis to see how close you are to your target month over month.