What is this break-even calculator?
A free, browser-based calculator that turns three numbers — fixed cost, unit price, and unit variable cost — into the answers you actually need: how many units you must sell to break even, the revenue that represents, and the contribution margin behind it. The exact formula is shown beside each result. Everything runs locally in your browser, so your numbers are never uploaded.
The formulas
- Contribution margin per unit = Unit price − Unit variable cost.
- Break-even units = Fixed cost ÷ Contribution margin per unit.
- Break-even revenue = Break-even units × Unit price.
- Contribution margin ratio = Contribution margin ÷ Unit price.
How to use it
- Enter your total fixed cost, the unit selling price, and the variable cost per unit on the left.
- Read the break-even point and contribution-margin summary on the right — each shows the formula used.
- If the contribution margin is zero or negative, no break-even exists and the result shows '—'.
Common use cases
- Deciding how many units a new product must sell to cover its launch costs.
- Testing how a price change shifts the break-even point before committing.
- Checking whether a campaign or subscription tier earns enough margin to be viable.