Break-Even Calculator

The break-even formula is: Fixed Costs ÷ (Price per Unit − Variable Cost per Unit). The result is the number of units you need to sell to cover all costs. To convert to revenue, multiply by your price per unit. The most common input error is understating variable cost per unit — include every cost that scales with each unit sold, not just direct materials.

Break-even in units tells you how many products, seats, or contracts you need to sell before costs are covered. Break-even in revenue gives you the equivalent in pound or dollar terms. For operations and capacity planning, units is the more useful output. For board presentations, investor decks, and financial models, revenue is typically the figure you’ll use, particularly when your product has variable pricing across tiers or geographies.

Fixed costs remain constant regardless of output: rent, core headcount, software licences, insurance. Variable costs change with each unit sold: materials, packaging, fulfilment, commissions. The distinction is the foundation of break-even. The grey area is semi-variable costs such as customer success headcount that scales with contract volume, or cloud hosting that increases with usage. Misclassifying these understates variable costs and makes the break-even point look easier to reach than it is.

The five components are: fixed costs (total overhead that doesn’t vary with output), variable costs per unit (costs that scale with each unit sold), selling price per unit (the revenue generated per unit), contribution margin per unit (derived: price minus variable cost per unit), and break-even point (the output level at which total revenue equals total costs). Each feeds directly into the calculator above. Getting the variable cost figure right is where most errors occur.

There’s no universal answer. A good break-even point is one that falls within the capacity and timeframe your business can realistically achieve. For a scale-up, the more useful question is whether the break-even unit count is achievable given your current growth rate, runway, and operational capacity. If break-even requires volume you can’t reach before funding runs out, the cost structure needs attention before the pricing conversation.

At pre-revenue stage, break-even anchors the financial model and sets the minimum the business needs to achieve. At Series A, it becomes the path-to-sustainability figure investors commonly look for in the deck. At Series B and beyond, it shifts from a survival metric to a pricing and capacity lever, used to model what happens to profitability when cost structure or unit economics change.

Most finance teams recalculate break-even in a spreadsheet each time costs or pricing change. DualEntry connects your actual GL data to your financial models, so contribution margin and cost structure inputs stay current without manual updates. When a new hire is approved or a supplier contract changes, the model reflects it. Break-even figures in board decks and fundraising models are based on live data, not last quarter’s export.