Break-Even Calculator
The break-even point is the minimum sales volume at which a business covers all its costs, neither earning a profit nor incurring a loss, and knowing it precisely is one of the most consequential numbers in any pricing or launch decision.
Formula
Worked example
Fixed $10,000, price $50, variable $30: contribution $20, break-even 500 units ($25,000 revenue), a 40% contribution margin ratio. A forecast of 800 units gives an 800 × 20 − 10,000 = $6,000 profit and a (800 − 500) ÷ 800 = 37.5% margin of safety.
How the Calculation Works
Break-even analysis divides total costs into two categories: fixed costs that do not change with output (rent, salaries, insurance) and variable costs that scale directly with each unit sold (materials, packaging, commissions). The break-even unit quantity is found by dividing total fixed costs by the contribution margin, the difference between the selling price per unit and the variable cost per unit. Break-even revenue is simply that unit quantity multiplied by the selling price. Both figures rest on the assumption that price and variable cost remain constant across the entire output range.
How to Use This Calculator
Enter your total fixed costs for the period you are analyzing, monthly, quarterly, or annual figures all work, as long as you are consistent. Input the selling price per unit and the variable cost per unit in the same currency, then select that currency from the dropdown. The calculator instantly returns the number of units you must sell and the corresponding revenue required to reach break-even. If you change the currency symbol only without changing the underlying numbers, the output updates cosmetically; recalculate from scratch if you are comparing figures across markets with different absolute cost levels.
What Affects Your Break-Even Point
A higher selling price widens the contribution margin and lowers the unit threshold, while any increase in variable cost per unit compresses that margin and raises it. Fixed costs have a one-for-one linear impact: doubling rent doubles the number of units needed before the business turns profitable. Product mix matters in multi-product businesses because each product carries a different contribution margin, so a shift toward lower-margin items effectively raises the blended break-even even if nothing else changes.
Limitations to Keep in Mind
Break-even analysis assumes a linear cost and revenue relationship, meaning price is constant and variable costs do not benefit from economies of scale, assumptions that rarely hold perfectly in practice. It treats inventory as sold immediately, so it does not account for the cash flow timing mismatch that affects businesses with long production cycles or slow-moving stock. The model also excludes taxes, interest expense, and working capital requirements, all of which are material to a complete profitability assessment. Use the break-even point as a floor estimate and a pricing sanity check, not as a substitute for a full pro-forma income statement.
Break-even and cost-volume-profit formulas
| Metric | Formula |
|---|---|
| Contribution margin per unit | price − variable cost |
| Contribution margin ratio | contribution ÷ price |
| Break-even units | fixed costs ÷ contribution per unit |
| Break-even revenue | fixed costs ÷ contribution margin ratio |
| Units for a profit goal | (fixed costs + target profit) ÷ contribution |
| Margin of safety | (forecast units − break-even units) ÷ forecast units |
The core relationships this calculator uses, in plain algebra.
Frequently asked questions
What is a good break-even point?
There is no universal benchmark, what matters is whether your realistic sales forecast clears the break-even threshold with a meaningful margin of safety. A common rule of thumb in small business planning is to target a sales volume at least 20-30% above break-even so that normal revenue fluctuations do not push the business into a loss. The appropriate margin depends heavily on the volatility of your market and the rigidity of your fixed cost base.
How does break-even analysis differ from payback period?
Break-even analysis identifies the ongoing sales volume at which revenue covers all costs in a given period, treating the business as a going concern. Payback period, by contrast, measures how long it takes to recover a specific upfront capital investment from net cash inflows. The two metrics answer different questions: break-even is an operational threshold, while payback period is a capital-budgeting metric used to evaluate whether an investment is worth making.
Can I use this calculator for a service business with no physical units?
Yes, substitute a billing unit for a physical unit. For a consulting firm, one unit might be one billable hour or one client engagement, with the price set to your average rate and the variable cost set to direct labor and delivery costs per engagement. The contribution margin logic is identical regardless of whether the output is a product or a service. Just ensure that every cost is classified consistently as either fixed or variable before you enter it.