Free tools · No signup · Zero data collected
Know your real profit before you sell.
Referral fees, fulfillment, payment processing, Offsite Ads — platforms take their cut before you ever see a dollar. Run the numbers first, then decide what to list, where, and at what price.
- 9 seller calculators
- $0 forever, no account
- 100% in-browser math
The toolbox
Pick the math you need
Every calculator is live — change any number and the receipt updates instantly. Nothing to install, nothing to sign up for.
Amazon FBA Profit Calculator
Price in referral fees, FBA fulfillment, storage, and inbound shipping to see true profit, margin, ROI, and your break-even price per unit.
Open tool →Shopify Profit Margin Calculator
Includes Shopify plan transaction fees and payment processing, so your margin reflects what actually lands in the bank on every order.
Open tool →Etsy Fee & Profit Calculator
Adds up the $0.20 listing fee, 6.5% transaction fee, payment processing, and Offsite Ads to reveal real profit on every Etsy sale.
Open tool →ROAS & Break-Even Calculator
Find your break-even ROAS before you scale spend. Compare it with actual campaign ROAS to know if your ads print money or burn it.
Open tool →Discount Pricing Calculator
Price percentage-off, BOGO, and spend-threshold deals against your real margin. See profit per unit after the discount and the maximum you can afford to give.
Open tool →Break-Even Units Calculator
Find the exact number of units you must sell to cover fixed costs. See how price, margin, and ad spend shift your break-even point — before you commit inventory.
Open tool →TikTok Shop Fee Calculator
Calculate TikTok Shop referral fees, affiliate commissions, and ad spend to see real profit per order. Includes category presets and refund admin fees.
Open tool →eBay Fee & Profit Calculator
Factor in final value fees by category, per-order charges, insertion fees, promoted listings, and Store subscriber savings to see true profit on every eBay sale.
Open tool →Platform Fee Comparison
Enter your price and cost once — instantly compare profit, fees, and margin across Amazon, eBay, Etsy, Shopify, and TikTok Shop. Find the most profitable platform in seconds.
Open tool →Why sellers calculate first
A $30 sale is rarely $30
Most listings die from optimistic math: sellers price against the sticker, not against the fee stack. By the time referral fees, fulfillment, processing, storage, and inbound freight take their share, a "healthy" price can leave you working for free.
The fix is boring and effective: run unit economics before you buy inventory or launch ads. Every tool here exists to answer one question — after everyone takes their cut, what's left for you?
- 01
Price with the fee stack, not against it
See every deduction line by line, exactly like the receipt.
- 02
Find your break-even before you commit
Know the minimum viable price for any product, ad, or channel.
- 03
Compare platforms on true margin
The same product can be profitable on Etsy and a loss on Amazon.
Questions
Frequently asked
Are these calculators really free?
Yes — every calculator on emallsoon is free, with no signup, no email wall, and no usage limits. The tools run entirely in your browser, so your numbers never touch a server.
How accurate are the fee rates?
We prefill each calculator with current published fee structures (Amazon referral and FBA fees, Shopify plan transaction fees, Etsy listing/transaction/payment fees, eBay final value fees by category). Rates change often and vary by category and country, so every field is editable — treat the defaults as a starting point and verify exact rates in Seller Central or your platform dashboard.
Do you store the numbers I enter?
No. All math happens locally in your browser with JavaScript. Nothing is sent to, or stored on, any server.
Which platforms do the tools cover?
Amazon FBA, Shopify, Etsy, TikTok Shop, eBay, a cross-platform fee comparison tool, paid-ad ROAS, discount pricing, and break-even units math that applies to any platform. More calculators are added regularly.