🏷️ Margin & Selling Price Calculator
Enter your item cost, target profit margin %, and an optional marketplace fee % to instantly get the required selling price, profit per unit, markup %, and fee amount — all calculated in your browser.
About
This calculator uses the standard margin formula — margin equals profit divided by selling price — to work backwards from your cost and desired margin to the exact selling price you need. It also factors in a marketplace fee (such as Amazon, Etsy, or eBay percentages) so you can price products correctly on any platform. Markup % is shown alongside margin % because the two are often confused: markup is profit divided by cost, while margin is profit divided by selling price. All calculations run instantly in your browser with no data sent anywhere.
How to use
- Enter the item cost — the total amount you pay to acquire or produce one unit.
- Set your target profit margin % — for example, 40 means you want to keep 40% of the selling price as profit.
- Optionally enter a marketplace fee % (e.g., 8 for an 8% platform commission) to include it in the price calculation.
- Read the results: required selling price, profit per unit, markup %, and marketplace fee amount are shown instantly.
- Adjust any input value and all results update in real time — try different margin targets or fee rates to compare scenarios.
FAQ
- What is the difference between margin and markup?
- Margin (gross margin) is profit divided by selling price. Markup is profit divided by cost. A 50% markup on a $10 cost gives a $15 selling price, but that is only a 33% margin — because $5 profit ÷ $15 selling price = 33%.
- How is the required selling price calculated when a marketplace fee is included?
- The formula is: Selling Price = Cost ÷ (1 − Margin% − Fee%). Both the margin and the fee are expressed as decimals. For example, cost $10, margin 30%, fee 8% gives $10 ÷ (1 − 0.30 − 0.08) = $16.13.
- What marketplace fee % should I use for Amazon, Etsy, or eBay?
- Referral fees vary by category and change over time. As a starting point: Amazon referral fees are commonly 8–15%; Etsy charges around 6.5% transaction fee; eBay final-value fees are typically 10–13%. Always check the platform's current fee schedule for your specific category.
- Can I use this to find a break-even price?
- Yes. Set the target margin to 0% (or just enough to cover the fee). The calculator will return the minimum selling price needed to cover your cost and any platform fee, with zero profit.
- Does this tool save my inputs?
- Your inputs may be saved in your browser's localStorage so they persist across page reloads. No data is sent to any server — everything stays on your device.