About This Break-Even Calculator
Use the break-even calculator to estimate how many units or orders must be sold before a product, campaign, or store covers its costs. Online sellers can use it for product launches, wholesale buys, advertising tests, subscription software costs, photo shoots, packaging runs, or new marketplace channels.
The goal is to make the calculation useful before a seller commits to a product, listing, promotion, or marketplace channel. Commerce Tally keeps the calculator visible near the top of the page and adds this guide so you can understand which inputs matter, how the result should be interpreted, and what to check next before relying on a number.
How to Use the Calculator
- Enter fixed costs such as software, photography, setup fees, or monthly overhead.
- Enter revenue per unit and variable cost per unit.
- Calculate the contribution margin per unit.
- Review the number of units or sales needed to break even.
- Test different prices, costs, and ad spend scenarios.
How the Math Works
Break-even units equal fixed costs divided by contribution margin per unit. Contribution margin is selling price minus variable cost. If contribution margin is too small, the required unit count rises quickly.
Calculator results are estimates, not official platform statements. Marketplace fees, processor rates, carrier charges, taxes, return costs, and discounts can change by category, region, seller account, customer location, and timing. Use the result as a planning checkpoint, then confirm important assumptions with your marketplace dashboard, accounting records, shipping software, or a qualified professional.
Interpretation Tips
- Separate fixed costs from variable costs so the result is meaningful.
- Use conservative assumptions for new products because early returns and ad costs can be unpredictable.
- Break-even does not mean the product is attractive; it only means costs are covered.
- Run best-case and worst-case scenarios before buying inventory.
Break-Even Calculator FAQ
What counts as a fixed cost?
Fixed costs are costs that do not change directly with each unit sold, such as software, setup fees, photography, and some overhead.
What is contribution margin?
Contribution margin is selling price minus variable cost per unit. It is the amount available to cover fixed costs and profit.
Should advertising be fixed or variable?
It depends on the campaign. A fixed launch budget can be treated as fixed, while per-order acquisition cost can be treated as variable.