How the math works
Profit = selling price − total cost. Margin % = profit / selling price × 100.
Example
- Enter what you paid (or will pay).
- Add fees, shipping, or ads if they apply.
- Enter the selling or current price.
Catch the catches
- Marketplace fees can turn a “good” sale into a loss. Include them.
Questions
Are these calculators free?
Yes. They run in your browser. You do not need an account, and we do not require personal financial data to use them.
Should I treat the result as a bank or store quote?
No. Results are educational math. Merchants, lenders, and tax rules can differ. Verify the live terms before you pay.