# Break-even calculator

> Free break-even calculator: fixed costs, price and variable cost per unit give the units and revenue you need to cover your costs. No sign-up.

Canonical page: https://superbooks.io/tools/break-even-calculator/

The break-even point is the number of sales at which revenue covers every cost. Each unit sold pays its own variable cost and leaves a contribution toward fixed costs; break-even is fixed costs divided by that contribution.

Formula: Contribution per unit = price − variable cost. Break-even units = fixed costs ÷ contribution, rounded up. Break-even revenue = units × price.

GET https://app.superbooks.io/api/tools/break-even

## Questions

### What is contribution margin?

What each sale leaves after its own variable cost, as a share of the price. At a price of 50 and a variable cost of 20, each unit contributes 30, a 60% contribution margin.

### Why is the number of units rounded up?

Selling one unit fewer than the exact figure leaves part of the fixed costs uncovered, so the first whole unit at or above it is the break-even point.

### Which costs are fixed?

Costs that do not change with how much you sell in the period, such as rent, salaries, software and insurance. Materials, payment fees and shipping per order are variable.