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Startup Toolkit · calculator

Break-even Calculator

Understand how fixed cost, selling price and variable cost combine—and why a non-positive contribution margin cannot cover fixed costs.

CalculateUnderstandDecide

CALCULATE

Enter your assumptions.

Nothing entered here is saved or sent to OpenSkool.

Symbol only. This tool does not convert currencies.

Your assumptions

Costs that do not change with each unit in the period being assessed.

UNDERSTAND THE RESULT

Your result will appear here.

Enter the assumptions you want to examine, then calculate. We will show the result, the arithmetic and its limits.

HOW WE CALCULATED THIS

The formula stays visible.

Each result uses only the values you enter. The calculator does not add hidden assumptions.

Contribution margin per unit
Selling price − variable cost
Break-even units
Fixed costs ÷ contribution margin per unit
Break-even revenue
Mathematical break-even units × selling price

UNDERSTAND BEFORE YOU DECIDE

What the number can—and cannot—tell you.

01

Mathematical and practical units differ

A formula can return part of a unit. When units or customers cannot be fractional, round the requirement upward to cover all fixed costs.

02

Contribution must be positive

If variable cost is equal to or greater than selling price, each additional unit contributes nothing—or adds a loss—toward fixed costs.

This calculator simplifies a business model to the values entered and is not financial or accounting advice.