Monthly fixed costs ($)Selling price per unit ($)Variable cost per unit ($)Monthly target profit ($)Planned monthly unit sales

A “unit” can mean one product, one project, one booking or one customer, as long as price and variable cost use the same unit.

Contribution margin connects sales to profit

Each sale contributes its price minus variable cost toward fixed costs. After fixed costs are covered, additional contribution becomes operating profit before taxes and costs not included in the model.

Use a downside scenario

Reduce the selling price to test discounting pressure.
Increase variable costs to reflect supplier or delivery changes.
Use a cautious sales volume rather than the best possible month.
Include owner compensation when it is a real operating requirement.

Educational estimate only. Actual accounting classifications and taxes may differ.

Published by RVR — Founder & Editor, IQlatorMethodology reviewed September 24, 2026Educational information

Use contribution margin to find a realistic break-even point

Break-even is the sales volume at which contribution from sales equals fixed costs. It separates costs that occur regardless of volume from costs that rise with every product, project or customer. This makes it useful for pricing, capacity and launch decisions.

How to use this page

Contribution margin per unit equals selling price minus variable cost per unit. Dividing monthly fixed costs by that margin estimates the units needed to break even. A target-profit calculation adds the desired profit to fixed costs before dividing.

Practical exampleIf a service sells for $120 and creates $45 of variable cost, each sale contributes $75 toward rent, software and other fixed costs. With $3,000 of fixed costs, 40 completed sales are required to break even.

Inputs to verify

Include payment processing, shipping, commissions and direct labor where applicable.
Use achievable selling prices after discounts and refunds.
Test a downside case with lower volume or higher variable costs.

Common questions

What if contribution margin is zero or negative?

Additional sales will not cover fixed costs. The price, direct cost or offer design must change before a meaningful break-even point exists.

Is owner salary a fixed cost?

Include the compensation the business must reliably provide. The classification can depend on how the owner is paid and how the analysis will be used.

Methodology and sources: Uses the standard cost-volume-profit relationship. This estimate does not replace accounting or tax advice.

Business Break-Even Calculator