Profit Margin Calculator
See what you actually keep after platform fees. Compare Shopify, Amazon, Etsy, eBay, TikTok Shop, and Walmart side by side.
Enter Your Product Details
What you pay per unit (COGS)
What the customer pays
Shipping you pay (not charged to customer)
Average ad cost to acquire one sale
How it works
Enter your costs
Plug in what you pay per unit and what you charge. Add shipping and ad costs if they apply. The calculator needs real numbers to give you real answers.
Pick your platform
Each marketplace takes a different cut. Etsy charges 6.5% plus payment processing. Amazon takes 15%. Shopify only charges payment processing. The calculator applies the correct fee structure automatically.
See the real numbers
Get your actual profit per unit after every fee is deducted. Compare across all platforms at once to see where you keep the most money.
Hidden costs most sellers miss
You sell a product for $40, it cost you $15. That's $25 profit, right? Not even close. Platform fees, payment processing, and listing costs eat into that margin fast, and most sellers don't calculate them until tax season.
Etsy is the worst offender for surprise fees. You pay 6.5% transaction fee, 3% + $0.25 payment processing, and $0.20 per listing. On a $40 sale, that's $4.05 in fees before you ship anything. Sellers who only track COGS think they're making $25 when they're actually making $20.95.
Amazon takes 15% off the top on most categories. On that same $40 item, Amazon keeps $6.00. If you use FBA, fulfillment fees add another $3-5 depending on size and weight. Your $25 "profit" is suddenly $14-16.
Then there's the stuff that's easy to forget: shipping supplies, return costs, ad spend per acquisition, and dead inventory. A product with a 60% gross margin can have a 15% net margin once you account for everything.
This calculator won't track all of that for you, but it shows you the platform fees that most sellers overlook. Start there, then add your other costs to get the full picture.
Questions
It depends on the business model, but 20-30% net margin is solid for most e-commerce products. Below 15% gets risky because one bad month of returns or slow sales can wipe out your profit. Above 40% is excellent but rare unless you're selling digital products or high-markup items.
They're based on current published rates as of 2024-2025. Amazon referral fees are 15% for most categories but vary (8-45% depending on category). Walmart ranges 8-15%. eBay's 13.25% covers most categories. Fees change, so check the platform's seller dashboard for the latest rates in your specific category.
FBA fees depend on product size, weight, and time of year (Q4 storage fees go up). This calculator shows the 15% referral fee that applies to all Amazon sellers. FBA fulfillment fees are separate and vary too much to estimate without your product's exact dimensions. Use Amazon's FBA calculator for those.
Yes, but separately. Most categories see 5-15% return rates. On a $40 item with a 10% return rate, you lose $4 per sale on average (sometimes more if you can't resell the returned item). Add that to your product cost for a more realistic margin.
For pure fee comparison, Shopify and custom/direct sales win since they only charge payment processing (2.9% + $0.30). But lower fees don't always mean more profit. Amazon's 15% fee comes with access to millions of buyers you'd never reach on your own site. The right platform is the one where your total profit (sales volume x margin) is highest.
Margin is profit divided by selling price. Markup is profit divided by cost. A product that costs $10 and sells for $20 has a 50% margin but a 100% markup. This calculator shows margin because that's what matters for your bank account. A 50% margin means you keep 50 cents of every dollar. Markup can make thin margins look better than they are.
Know your real margins
Plug in your product and see what you actually keep.