Break-even formula
Break-even units = Fixed costs ÷ (Price per unit − Variable cost per unit). The denominator is contribution margin per unit.
When selling multiple products, use weighted contribution margins or run separate scenarios per product line.
Limitations
Break-even models assume linear variable costs and stable prices. Step costs, discounts, and capacity constraints may require segmented analysis.
Use break-even output to frame decisions — not as a guarantee of profitability at actual operating conditions.
Key takeaways
- Contribution margin per unit drives break-even volume.
- Fixed cost changes shift break-even without affecting margin per unit.
- Validate assumptions when costs are non-linear.
Related calculators
Apply these concepts with formula-based tools on Calculator Factory.
- BusinessBreak-Even Calculator
Find how many units you must sell to cover fixed costs based on price and variable cost per unit.
- BusinessBreak-Even Sales Calculator
Find how many orders you need each month to cover bills and hit your profit goal.
- AccountingContribution Margin Calculator
Calculate contribution margin per unit, margin ratio, and total contribution to cover fixed costs and profit.
FAQ
- Can break-even be expressed in revenue?
- Yes. Break-even revenue = Fixed costs ÷ Contribution margin ratio when margins are expressed as a percentage of revenue.