Break-even is the point where total contribution from sales covers fixed costs, leaving zero operating profit or loss under the assumptions used. Divide fixed costs by contribution per unit, where contribution per unit is selling price minus variable cost per unit. Round units up to the next whole item.
Break-Even Analysis: Units, Revenue and Target Profit
Use this guide alongside the interactive calculator above. It explains the calculation, the assumptions behind the result and the practical checks to make before using the estimate in a business decision.
Formula used by this calculator
Contribution per unit = Selling price per unit − Variable cost per unit. Break-even units = Fixed costs ÷ Contribution per unit (rounded up). Units for target profit = (Fixed costs + Target profit) ÷ Contribution per unit (rounded up).
Worked example
With $2,000 fixed costs, a $50 selling price and $30 variable cost, contribution is $20 per unit. Break-even is $2,000 ÷ $20 = 100 units.
What break-even tells a business
Break-even analysis estimates the sales volume needed to cover the costs included in a model. At the break-even point, total contribution equals fixed costs. Sales above that point may generate operating profit, while sales below it may leave some fixed costs uncovered. It is a planning tool, not a prediction that a certain number of customers will buy.
The calculation is useful when evaluating a product launch, planning a sales target, comparing price options or understanding how a change in supplier cost affects the number of units needed. It can also help explain why revenue growth does not always produce profit: each sale must first cover its variable cost before contributing toward fixed expenses.
Fixed costs, variable costs and contribution
Fixed costs are expenses that generally do not change directly with each unit sold over the period being analyzed. Examples may include rent, software subscriptions, insurance or a fixed monthly service fee. Variable costs rise with production or sales volume, such as unit materials, product purchase cost, packaging or per-order fulfillment.
Contribution per unit is the amount left from the selling price after variable cost per unit is deducted. That contribution is available to cover fixed costs and then profit. If variable cost equals or exceeds selling price, contribution is zero or negative and the standard break-even formula cannot produce a meaningful positive sales target.
How to use the Fincelio Break-even Calculator
Enter fixed costs for a clearly defined period, such as one month. Enter the selling price per unit and the variable cost per unit for the same product and period. Add a target profit amount if you want to estimate the number of units required to reach a profit goal beyond break-even.
Review contribution per unit, break-even units and break-even revenue. Units are rounded up because a business generally cannot sell a fraction of a physical item. The calculator also shows estimated profit or loss at 50, 100 and 200 units using the same contribution and fixed-cost assumptions. These are comparison scenarios, not forecasts.
Keep the time period consistent
A common source of error is mixing monthly fixed costs with annual revenue or per-unit variable costs from a different product. Fixed costs and the target profit must refer to the same time period. The selling price and variable cost should describe one comparable unit. If you sell several product types with different prices and costs, a single-product break-even result may not represent the whole business.
For a product range, you may need a weighted average contribution based on the expected sales mix. If the mix changes, the break-even point can change even when total fixed costs remain the same. This calculator uses one selling price and one variable cost per unit, so treat its result as a focused estimate for a consistent product or average unit.
What the basic model leaves out
The calculator does not automatically model income tax, financing costs, multiple product lines, capacity limits, seasonal demand, price changes or step-fixed costs. It also assumes the entered selling price and variable cost remain constant across the scenario volumes. In real operations, supplier discounts, overtime, shipping bands and platform fees may change as volume changes.
If percentage-based fees vary with selling price, include a realistic per-unit estimate in variable cost for the current price. If a promotion changes the selling price, calculate a new contribution per unit. For important budgets, compare this simplified estimate with accounting records and consider professional advice.
Use break-even to compare decisions
Try changing one input at a time. A higher selling price increases contribution if costs remain unchanged, while a higher variable cost reduces it. Lower fixed costs reduce the number of units required to break even. These relationships can help identify which assumptions have the largest effect on a plan.
Use the result alongside market research and operational capacity. A break-even target of 500 units is only useful if your business can realistically produce, market and deliver 500 units during the period. For product pricing, pair this tool with the Selling Price Calculator. For unit economics, review the Product Cost and Profit Margin calculators.
Frequently asked questions
What is the break-even formula?
Break-even units = Fixed costs ÷ (Selling price per unit − Variable cost per unit), rounded up to a whole unit.
What is contribution per unit?
It is the selling price per unit minus the variable cost per unit. It contributes toward fixed costs and profit.
Why are break-even units rounded up?
A business normally needs to sell a whole unit, so a fractional result is rounded up to the next whole unit.
Can break-even be negative?
If variable cost is equal to or higher than selling price, contribution is not positive. The standard model cannot reach break-even at that price and cost structure.
Does break-even include tax?
Not automatically. The tool uses the costs and target profit you enter. Tax and accounting treatment should be reviewed separately.
Related Fincelio calculators
These calculations are educational estimates based on the values and assumptions entered. They do not replace accounting, tax, customs or legal advice. Verify important decisions against your business records and applicable professional guidance.