Break-Even Point Formula Calculator
Use the break-even point formula calculator to find the units and sales revenue needed to cover fixed costs. It also checks forecast profit and margin of safety across several sales volumes.
Written and checked by TheToolNet Editorial Team · Last reviewed: September 27, 2026 · Editorial method
Break-even units = fixed costs ÷ (selling price per unit − variable cost per unit).
Calculate break-even point in units and dollars
How to read the break-even analysis
Contribution per unit is selling price minus variable cost. Each unit contributes that amount toward fixed costs until they are covered. After break-even, the same contribution becomes operating profit under this simple single-product model.
Break-even sales dollars
This page multiplies exact break-even units by price. The equivalent revenue formula is fixed costs ÷ contribution margin ratio, where the ratio is (price − variable cost) ÷ price. Practical units are rounded upward because a fractional unit cannot normally be sold.
Margin of safety
Margin of safety compares forecast units with break-even units. A positive percentage shows how far forecast volume could fall before reaching break-even; a negative percentage indicates the forecast is below break-even.
Official formula reference
The U.S. Small Business Administration uses the same unit formula and notes that inputs should share a time period. See the SBA break-even point guide.
Model limits
This single-product model assumes constant price, unit variable cost, fixed costs, and sales mix. Capacity steps, discounts, tax, inventory changes, multiple products, and nonlinear costs need a more detailed model. Use the gross margin calculator to check unit economics.
Frequently asked questions
Why must price exceed variable cost?
Otherwise each additional sale contributes nothing or increases the loss, so no finite sales volume covers fixed costs.
Should owner salary be fixed cost?
Include it if it is a recurring period cost in the scenario you are analyzing.