Enter a price.
See every fee and what you actually keep.
Amazon FBA, Etsy, eBay and Shopify fee structures built in, with the 2026 rate tables. No sign-up, no ASIN, no browser extension — it runs in your browser.
Where to start
Pick the question you have right now.
Calculators
Results can be shared as a URL; your inputs stay on your device.
Free Amazon FBA profit calculator with the 2026 US fee tables: referral fee by category, FBA fulfillment fee by size tier and weight, monthly storage, the 3.5% surcharge, PPC and inbound cost. See net profit, margin, ROI and break-even price — no login, no ASIN required.
Calculate → 🧶 Etsy Fee CalculatorListing + 6.5% + processing → payoutFree Etsy fee and profit calculator: $0.20 listing fee, 6.5% transaction fee on price + shipping, payment processing (3% + $0.25 US), Offsite Ads 15% or 12%, sales tax. See your payout, net profit, margin and break-even price.
Open → 🏷️ eBay Fee CalculatorFinal value fee + per-order → profitFree eBay seller fee calculator for US sellers without a store subscription: final value fee by category (13.6% most categories), $0.30/$0.40 per-order fee, promoted listings, international fee, insertion fee. See net profit, margin and break-even price.
Open → 🛒 Shopify Fee CalculatorPlan + card fees per orderFree Shopify fee calculator: Basic, Grow, Advanced and Plus plan pricing, Shopify Payments card rates (2.9%, 2.7%, 2.5% + 30¢), third-party gateway fees (2%, 1%, 0.6%), cost per order at your monthly volume — and how it compares with Amazon, Etsy and eBay fees for the same product.
Open → 🏛️ SBA Guarantee Fee Calculator7(a) upfront fee → FY 2027 ratesFree SBA loan guarantee fee calculator using the official FY 2027 and FY 2026 schedules — 7(a) upfront fee by loan size, plus 504 and Express fees.
Open → ⚖️ Marketplace Fee ComparisonOne product, four channelsEnter one product's price and cost to compare fees and net profit side by side on Amazon, Etsy, eBay and Shopify, using 2026 fee schedules.
Open → 📈 Profit Margin Calculator for SellersPrice → net profit → target priceFree profit margin calculator for marketplace sellers: selling price, product cost, marketplace fee %, fixed fees, shipping, ads, discounts, return rate and monthly volume → net profit per order, margin, ROI, break-even price, the price for a target margin, and monthly profit.
Open → 🎯 Break-even ACoS & ROAS CalculatorMargin → ACoS ceiling → max CPCFree break-even ACoS calculator for Amazon PPC and other marketplace ads: enter price, cost and fees to get break-even ACoS and ROAS, a target ACoS for the margin you want to keep, the maximum cost per click from your conversion rate, and TACoS.
Open → ↩️ Return Rate Profit CalculatorReturn rate → expected profitFree calculator for the true cost of returns: return rate, return postage, resellable share, fees the platform keeps on a refund and ads already spent → expected profit per order after returns, break-even return rate, and the price that absorbs your return rate.
Open → 🚢 Landed Cost Calculator (US Import)FOB → duty → landed per unitFree landed cost calculator for importing into the US: FOB price, freight and insurance, HTS duty rate, additional tariffs, merchandise processing fee, harbor maintenance fee, brokerage and inland delivery → total landed cost per unit and the selling price needed for your margin.
Open → 💵 Payout & Cash Flow CalculatorLead time + payout lag → cash neededFree cash-flow calculator for Amazon, Etsy, eBay and Shopify sellers: daily units, price, landed cost, supplier lead time, batch size and the platform's payout lag → cash tied up per batch, batches in flight, cash needed to sell continuously, day of first payout and monthly profit.
Open →Guides
The rules and numbers behind the calculators.
SBA's FY 2027 7(a) and 504 upfront fee rates effective October 1, 2026, the new 0% fee for rural and manufacturing loans, plus worked examples.
02 SBA 504 Loan Fees Explained (FY 2027)Upfront & AnnualSBA 504 loan fees for FY 2027, effective October 1, 2026: the 0.50% upfront guaranty fee, the 0.203% annual service fee, the fee waiver for manufacturers and rural businesses, and how 504 differs from 7(a).
03 How the SBA 7(a) Guarantee Fee Is Calculated (with Examples)How SBA's 7(a) upfront guaranty fee is figured for FY 2027: it is a percent of the guaranteed portion, not the whole loan. The tier rates, the guaranty percentage, and four worked examples from $50,000 to $2 million.
04 Amazon FBA fees explained (2026)referral, fulfillment, storage and what is leftEvery fee Amazon charges an FBA seller in the US in 2026, with the current rates, how each one is calculated, and a worked example from $24.99 down to net profit.
05 Etsy Fees Explained (2026): How Much Etsy Really TakesEvery Etsy seller fee for 2026: $0.20 listing, 6.5% transaction, payment processing by country, and Offsite Ads — with a worked $25 example.
06 eBay final value fees by category (2026)rates, per-order fee, store vs no storeeBay's 2026 selling fees for US sellers: final value fee by category (13.6% for most), the $0.30/$0.40 per-order fee, insertion fees, promoted listings, the international fee, and what changes with a store subscription.
How the rates stay current
Every rate on this site is taken from the marketplace's own published fee page — Amazon Seller Central help pages, etsy.com/legal/fees, eBay's selling-fees page and shopify.com/pricing — and each calculator shows the date it was last verified. A script re-reads those pages and related news every day and flags any change for review, so the "last automated check" date above moves daily and the "rates as of" date moves only when something actually changed. Sources and dates are listed on the data sources page.
sellmath is an independent site made by a software developer who builds automation for online sellers. It is not affiliated with Amazon, Etsy, eBay or Shopify. Calculations are estimates for planning; confirm in your seller account before you commit. The Korean edition, 셀러툴, covers Coupang, Naver Smart Store and other Korean marketplaces.