Selling online means dealing with fees on top of fees. Etsy’s transaction fee, Shopify’s payment processing, Amazon’s referral fee, eBay’s final value fee. Every platform calculates differently, and the numbers change often enough that last year’s spreadsheet is probably wrong.
We built 10 free calculators to fix this. They cover every major ecommerce platform plus cross-platform profit comparisons, tariff calculations, and business planning tools. Everything runs in your browser, no signup required.
Platform Fee Calculators
These are the core tools. Enter your product details and get an exact breakdown of every fee a platform will charge you.
Etsy Fee Calculator covers listing fees, the 6.5% transaction fee, payment processing, Offsite Ads (including the mandatory 12% for sellers over $10K), and the regulatory operating fee. Etsy’s fee structure is one of the most complex out there because fees apply to shipping too, so the numbers surprise a lot of sellers.
Shopify Fee Calculator lets you compare fees across Basic, Shopify, and Advanced plans, including credit card rates and the third-party payment provider fee (which goes away if you use Shopify Payments). The plan that saves you the most money depends on your monthly volume, and this calculator shows you exactly where the breakpoints are.
Amazon FBA Calculator breaks down referral fees by category, FBA fulfillment fees by size tier, and monthly storage costs. It also compares FBA vs. FBM (Fulfilled by Merchant) so you can see when it makes sense to handle shipping yourself.
eBay Fee Calculator handles final value fees (which vary by category), Managed Payments processing, and promoted listings costs. eBay’s fee structure changed significantly with Managed Payments, and many sellers are still using outdated numbers.
Comparison and Planning Tools
Platform Fee Comparison is probably the most useful tool for sellers who sell on multiple platforms or are deciding where to list. Enter one product and see your net profit on Amazon, eBay, Etsy, Shopify, and Walmart side by side. It’s the quickest way to find out where your margins are strongest.
Tariff & Landed Cost Calculator helps sellers who source products internationally. Enter your product category, country of origin, and product value to get estimated import duties and landed costs. With tariff rates shifting frequently, this saves a lot of manual HTS code lookup.
Profit and Business Tools
ROAS Calculator tells you whether your ad spend is profitable. Enter your revenue and ad costs to get return on ad spend, cost per acquisition, and break-even ROAS. Useful for anyone running Facebook, Google, or TikTok ads for their store.
Break-Even Calculator shows how many units you need to sell to cover your fixed and variable costs. Straightforward but important, especially if you’re launching a new product line or considering a new platform.
Dropshipping Profit Calculator accounts for supplier costs, platform fees, ad spend, returns, and all the other line items that eat into dropshipping margins. The real margin is almost always lower than what people expect.
Wholesale Markup Calculator helps you set retail prices from wholesale cost. Compare markup vs. margin strategies and find the price point that hits your target profitability.
Why We Built These
Ritely is an AI-powered Shopify app for product descriptions and listing optimization. But we noticed that the sellers who need better descriptions also need basic business tools, and most of what’s out there either requires an account, uses outdated fee data, or only covers one platform.
These calculators are free and will stay free. They’re part of a growing set of tools at ritely.dev/tools that we’re building for online sellers regardless of what platform they use.
Have a tool you’d like to see? Drop us a line at ben@ritely.dev.