Seller ProfitBreak-even calculator for sellers
Fixed costs do not care how many orders you get. This shows how many units you need just to stand still, and how many to earn something.
The idea
Every unit you sell contributes a small profit after its own costs. Fixed costs are paid out of that pile of contributions. Until the pile is as big as the fixed costs you are working for nothing. With fixed costs of 15,000 and a profit of 85 per unit, the answer is 177 units a month, about 6 orders a day.
What moves the number
- Raising the profit per unit lowers the units needed in proportion. A 10 percent rise in profit cuts the units by about 9 percent.
- Cutting fixed costs works the same way. Review every subscription once a year.
- Returns and ads reduce the profit per unit; use the expected profit after returns for a safer number.
A check on reality
Compare the daily orders you need with the orders you get now. If you need 12 a day and get 3, you either need to change the price, the cost or the idea. Starting a new product with a small budget to test demand is better than ordering a large stock first.
Common questions
What are fixed costs?
Costs you pay whether you sell or not: a tool subscription, rent for a shelf or room, a salary, a monthly ad budget you will not cut, a fee for a shop plan.
What if I sell many products?
Use the average profit per unit across your products, weighted by how many of each you sell, or run the calculation for your best-selling product alone to see if it carries the fixed costs.
Keep going
Fee percentages, GST rates and other figures in the examples on this site are made up to show the working. They are not the fees or rates of any marketplace or country: type the numbers from your own seller account and from the tax authority. Checked 14 November 2026.