Break-even calculator
Units and revenue to cover fixed costs given contribution margin.
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About Break-even calculator
Find break-even units and revenue from fixed costs, price per unit, and variable cost per unit.
Break-even is the volume where contribution margin finally covers fixed costs. Units ≈ fixed costs ÷ (price − variable cost). Revenue at break-even is those units times price. If price does not beat variable cost, there is no break-even — you lose money on every sale.
This is the classroom and early-business version: one product, constant price, constant variable cost, lump of fixed costs. It will not model tiered pricing, seasonality, or tax shields. It will tell you whether the unit economics pencil before you decorate a spreadsheet.
ROI asks how an investment performed after the fact. Break-even asks how many units you need before you stop losing money. Sales tax and discount tools help with the price you charge; they are separate from this volume math.
How to use Break-even calculator
- 1Enter fixed costs, selling price per unit, and variable cost per unit.
- 2Confirm contribution margin is positive.
- 3Read break-even units and break-even revenue.
What it won't do
- Single product, constant costs and price.
- No multi-product mix or step-fixed costs.
Common questions
Does the break-even calculator include taxes?
No. It uses contribution margin before tax. Tax changes the cash story; it is not in this formula.
Why is break-even undefined or empty?
Usually because price per unit is not greater than variable cost. Contribution must be positive or you never cover fixed costs.
Are units rounded up?
Yes — you cannot sell a fraction of a unit in most businesses, so the page ceilings to a whole unit when needed.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation