Know What You
Actually Earn
on Every Order
Calculate product costs, selling fees, shipping, advertising, returns, and true net profit before you list your products.
Why Ordinary Margin Calculators
Miss Real Costs
Most basic calculators stop at Selling Price minus Product Cost. MerchSites tracks the entire ecommerce expense sequence, so you see exactly where a $50 order really goes.
What Looks Profitable
vs. What You Actually Earn
Here is how a $45.00 retail product with $5.00 shipping and a $12.00 unit cost looks on paper versus what actually reaches your bank account.
Ignores freight, mailers, platform fees, gateway rates, ad spend, and refunds.
Reflects true bank payout after all 7 expense sequence layers are subtracted.
Calculators Built for Every Business Model
Product Margin Calculator
Calculate gross profit, net margin, total platform fees, fulfillment costs, and return risk per order.
Best for: Shopify, Etsy, Amazon & Direct-to-Consumer Sellers
OpenChannel Comparison Calculator
Compare true net profit for one product across Amazon, Etsy, eBay, Shopify, TikTok Shop, and Walmart after real fees.
Best for: Multi-Channel Sellers Choosing Where to List
OpenEcommerce Profit Calculator
Model complete order variable expenses, contribution profit, net margin, and monthly scaling projections.
Best for: Online Merchants & D2C Brands
OpenShopify Fee & Profit Calculator
Calculate Shopify plan costs, transaction fees, payment processing, app costs, and net profit per order.
Best for: Shopify Store Merchants
OpenRetail Margin Calculator
Calculate initial margin, maintained margin, shrinkage loss, and maximum markdown before loss.
Best for: Retail Store Buyers & Merchandisers
OpenRetail Price Calculator
Calculate recommended retail selling price from unit cost, target margin %, fees, and markdown allowance.
Best for: Retailers & Store Managers
OpenFree ecommerce profit guides
Gross Margin vs Net Profit in Ecommerce: Why 60% Becomes 16%
Understand why a healthy gross margin shrinks to a thin net profit once fees, shipping, ads, and returns are counted, and how to protect the number that reaches your bank.
Read guideAmazon FBA Fees Explained (2026): Referral, Fulfillment and Storage
A plain-English breakdown of the three Amazon fee layers that decide your FBA profit: referral fees by category, per-unit fulfillment fees by size, and monthly storage.
Read guideHow to Price a Product for Profit: A Step-by-Step Framework
A repeatable framework for pricing physical products so the price actually covers COGS, fulfillment, fees, ads, and returns, and still leaves a healthy margin.
Read guideStop guessing what you actually earn
Enter your product once and see your true net profit per order after every fee, in seconds. Free, no signup, calculated privately in your browser.
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