Profit Margin Calculator
Calculate margins, ROI, and break-even for any product
Rent, subscriptions, etc. Used for break-even calculation.
How to Use Profit Margin Calculator
- 1
Enter product costs
Set your cost price (what you pay for the product) and your selling price (what the customer pays).
- 2
Select a marketplace
Choose Amazon, eBay, Etsy, Shopify, or Custom. The tool applies the correct fee structure automatically.
- 3
Add additional costs
Enter per-unit shipping and advertising costs. Optionally add monthly fixed costs for break-even analysis.
- 4
Read results instantly
View profit per unit, gross margin, net margin, ROI, marketplace fee, and a full cost breakdown — all updating in real time as you adjust inputs.
Frequently Asked Questions
Is my data safe?
What is the difference between gross margin and net margin?
Are the marketplace fee percentages accurate?
What is ROI and how is it calculated here?
How does the break-even calculation work?
Can I use this for services instead of physical products?
Learn more
What Is Profit Margin Calculator
Calculate profit margins, ROI, and break-even points for any product you sell online. Enter your cost price, selling price, marketplace fees, shipping, and advertising costs — the calculator instantly shows profit per unit, gross margin, net margin, ROI, and monthly break-even units. Supports preset fee structures for Amazon, eBay, Etsy, and Shopify, plus a custom option for any marketplace. Everything runs in your browser — no sign-up, no data sent to any server.
Why Use Profit Margin Calculator
- Instant results — enter your numbers and see profit per unit, gross margin, net margin, and ROI update in real time. No waiting, no spreadsheet formulas.
- Marketplace fee presets — built-in fee structures for Amazon (15%), eBay (13.25%), Etsy (6.5% + $0.20), and Shopify (2.9% + $0.30) so you don't need to look them up.
- Custom marketplace support — set your own fee percentage and fixed fee for any marketplace, platform, or sales channel not listed in the presets.
- Full cost accounting — includes product cost, marketplace fees, shipping, and advertising costs per unit for an accurate net profit figure.
- Break-even analysis — enter your monthly fixed costs (rent, subscriptions, software) and see exactly how many units you need to sell each month to cover them.
- 100% private — all calculations happen in your browser. Your pricing data is never sent to any server.
Profit Margin Calculator Use Cases
Product pricing decisions
Before listing a new product, enter your cost price and experiment with different selling prices to find the sweet spot that delivers a healthy margin after all fees and costs.
Marketplace comparison
Compare the same product across Amazon, eBay, Etsy, and Shopify to see which marketplace leaves you with the highest net profit after platform-specific fees.
Advertising budget planning
Adjust the ad cost per unit to determine the maximum you can spend on advertising per sale while maintaining a target profit margin.
Break-even planning for new businesses
Enter your monthly fixed costs — warehouse rent, software subscriptions, insurance — to calculate the minimum number of units you need to sell each month to break even.
Tips & Best Practices
- 💡Include all variable costs in your calculation — not just the product cost. Packaging materials, prep fees, and return shipping costs should be factored into either cost price or shipping.
- 💡Marketplace fees vary by category. Amazon charges 15% for most categories but 8% for electronics and 20% for jewelry. Adjust the custom fee field to match your actual category rate.
- 💡If you sell on multiple marketplaces, run the calculator once per platform with the same product to compare net margins side by side.
- 💡Use the break-even feature to set monthly sales targets. If the break-even number is unrealistically high, consider raising your price or reducing fixed costs before launching.
How It Compares
Spreadsheets can handle margin calculations but require building and maintaining formulas. Amazon's Revenue Calculator only covers Amazon fees and requires an active seller account. This tool works for any marketplace, includes all cost components in one view, requires no account, and keeps your pricing data completely private in your browser.