Free Ecommerce Seller Calculator Hub
Calculate product profit, marketplace fees, shipping costs, payment fees, discounts, returns, inventory turnover, and break-even points before you make seller decisions.
Commerce Tally provides free educational calculators for ecommerce sellers. All results are estimates only and should not be considered financial, tax, legal, accounting, shipping, or business advice.
What Commerce Tally Does for Sellers
Commerce Tally is a free calculator and guide library for ecommerce sellers who need simple planning numbers before pricing a product, listing on a marketplace, offering a discount, choosing packaging, or buying inventory. The tools help you turn scattered costs into clearer estimates so you can compare options with less guesswork.
Who it is for
Etsy, eBay, Amazon, Shopify, handmade, resale, and small online store sellers who want to understand margins, fees, shipping, returns, and inventory before changing prices.
Why use it
A bare product cost does not show true profit. Marketplace fees, payment fees, packaging, shipping, discounts, and returns can all change whether an order is healthy.
How to read results
Treat calculator outputs as planning estimates. Verify current fees, tax rules, carrier rates, and account-specific terms before making important business decisions.
Last updated: July 17, 2026 | Reviewed by the Commerce Tally Editorial Team
Calculator Categories
Featured Calculators
Ready to make informed seller decisions?
Use the calculators above to compare margins, fees, shipping costs, and pricing scenarios. Each tool gives you estimates you can act on — bookmark the ones you use most.
Popular Ecommerce Guides
Use the guides to understand the decisions behind the calculators: how costs are layered, why estimates can change, and which related tool to use next.
Pricing
Profit Margin vs Markup for Online Sellers
Margin vs markup for online sellers: why they differ, a markup to margin conversion table, and 5 worked examples to price your products with confidence.
Costs
True Product Cost Checklist for Ecommerce Sellers
Build a better landed cost by including product cost, inbound freight, packaging, prep, fees, and expected loss.
Marketplace Fees
How Marketplace Fees Affect Pricing
Learn how commission, fixed fees, payment fees, ads, and category rules change net proceeds.
Marketplace Fees
Etsy, eBay and Amazon Fee Comparison Guide
Compare fee structures across major marketplaces and learn why net proceeds matter more than gross price.
Shipping
Shipping Costs and Free Shipping Strategy
Plan shipping charges, free shipping thresholds, packaging costs, and margin protection for online stores.
Shipping
Dimensional Weight Guide for Sellers
Learn how package dimensions, carrier divisors, and billable weight affect ecommerce shipping cost.
Frequently Asked Questions
Are these calculators free to use?
Yes, all Commerce Tally calculators are completely free to use. No registration or payment required.
How accurate are the fee calculations?
Our calculators use editable example fee fields, but marketplace fees can change. Always verify current rates with the platform directly before making business decisions.
Can I use these calculators for tax purposes?
No. These calculators provide educational estimates only and should not be used for tax filing, legal compliance, or official financial reporting. Consult a tax professional for accurate guidance.
Do you store my calculation data?
No. All calculations are performed in your browser. We do not store or transmit your calculation data to our servers.
Which marketplaces do you support?
We provide dedicated calculators for Etsy, eBay, and Amazon, plus a generic marketplace fee calculator for other platforms.
How do I calculate profit margin vs markup?
Profit margin is calculated as (Revenue - Cost) / Revenue, while markup is (Selling Price - Cost) / Cost. Use our dedicated calculators for each to see the difference.
What is dimensional weight?
Dimensional weight is a pricing technique used by shipping carriers that considers package size in addition to actual weight. Our calculator helps you estimate this for accurate shipping cost planning.
Can I suggest a new calculator?
Yes! Contact us at hello@commercetally.com with your calculator suggestions. We are always looking to add tools that help ecommerce sellers.