Break-Even Calculator

The break-even calculator turns a cost structure into a sales target. It answers a specific operating question: how many units must be sold before the contribution from each sale fully covers fixed costs? Enter fixed costs, price per unit, and variable cost per unit. The results include exact break-even units, break-even revenue, contribution per unit, contribution margin, the rounded-up whole-unit target, and the revenue at that whole-unit target.

This page is written for business planning, pricing tests, launch decisions, and owner reviews. It is intentionally narrower than a full forecast. Break-even does not predict demand, cash timing, taxes, financing, or capacity. It isolates the point where revenue equals total cost under the assumptions you enter, which makes it useful for comparing possible prices, supplier quotes, campaign budgets, or production methods before you commit cash.

How to use this calculator

Use one consistent planning period. If fixed costs are monthly, enter the monthly rent, base payroll, software, insurance, equipment lease, and campaign spend. If fixed costs are for a product launch, enter the one-time setup costs that the launch needs to recover. The price per unit is the pre-tax selling price for one product, subscription, ticket, service hour, shipment, or completed job. The variable cost per unit is the direct cost that rises with each sale: materials, packaging, merchant fees, commissions, billable labor, fulfillment, or usage-based platform cost.

The calculator first checks that price is positive and that fixed and variable costs are not negative. It then subtracts variable cost per unit from price per unit. If the result is zero or negative, it reports that no break-even point exists because more volume would not cover fixed costs. If contribution is positive, it divides fixed costs by contribution per unit and shows the exact unit count. Because real sales usually happen in whole units, it also rounds up and shows the revenue generated by that rounded target.

For planning around the same inputs, compare the contribution percentage with the contribution margin calculator, test price formation with the markup calculator, and check target gross margin with the margin calculator. Those pages use related numbers but answer different questions.

Formula

Contribution per unit is the amount from each sale that remains after the sale’s own variable cost:

$\text{contribution per unit} = \text{price per unit} - \text{variable cost per unit}$

Break-even units divide fixed costs by that per-unit contribution:

$\text{break-even units} = \frac{\text{fixed costs}}{\text{contribution per unit}}$

Break-even revenue multiplies the exact unit count by the selling price:

$\text{break-even revenue} = \text{break-even units} \times \text{price per unit}$

The contribution margin shown by the calculator is the contribution per unit as a share of price:

$\text{contribution margin} = \frac{\text{contribution per unit}}{\text{price per unit}} \times 100$

Example

Suppose fixed costs are USD 5,000, price per unit is USD 50, and variable cost per unit is USD 20. These are the default values in the form.

The exact break-even point is 166.67 units because the formula can produce fractions. Operationally, selling 166 units would bring in USD 8,300 of revenue and USD 4,980 of contribution, which is USD 20 short of the fixed-cost target. Selling 167 units brings in USD 8,350 of revenue and USD 5,010 of contribution, which clears fixed costs by USD 10 before any other expenses or taxes.

Benchmarks and interpretation

There is no universal good break-even point. A software product with high fixed development cost and low variable cost might tolerate a large unit target because each additional subscription contributes heavily after launch. A food stand with low setup cost but high ingredient and labor cost may need fewer sales to break even, yet produce less profit per sale. The useful benchmark is whether the required units are realistic for the channel, capacity, season, and cash runway.

Contribution margin also matters. A 60% contribution margin, as in the example, means every USD 1 of revenue contributes USD 0.60 toward fixed costs and then profit. A 10% contribution margin means the business must sell much more revenue to cover the same fixed-cost base. If the break-even revenue looks unreachable, the strongest levers are usually price, variable cost, and scope of fixed spending. Cutting fixed costs helps, but improving contribution per unit can move the result faster because every sale benefits.

Markup, margin, and break-even are not the same

Markup, margin, and break-even often appear in the same pricing conversation, but they use different denominators. Markup is profit compared with cost. Margin is profit compared with selling price. Break-even asks how many sales are needed when each sale contributes a known amount toward fixed costs. If you raise price using a cost-plus markup, the contribution per unit may improve; if you set price using a margin target, the contribution ratio may be more predictable. Either way, break-even converts the resulting contribution into a volume target.

Practical tips

• Separate fixed and variable costs before using the calculator. Do not bury a fixed salary allocation inside variable cost unless that salary truly changes with each unit.
• Use realistic average variable cost. Payment fees, refunds, spoilage, and packaging can make the true cost higher than the obvious material cost.
• Model discounts as lower price, not as a note outside the calculation. A discount lowers contribution per unit and raises the break-even unit target.
• Recalculate when sales mix changes. If customers buy multiple products with different margins, a single-product break-even calculation is only an approximation.
• Add desired profit to fixed costs only for a target-profit scenario, and label it as such.

Sources

• U.S. Small Business Administration, Calculate your startup costs — startup and fixed-cost planning categories.
• U.S. Small Business Administration, Manage your finances — small-business budgeting, cash flow, and financial control guidance.
• AccountingTools, Contribution margin — contribution margin definition and use in break-even planning.