Seller Tools
Profit calculators for Amazon and TikTok Shop sellers that count the whole fee stack — referral, fulfillment, surcharges, affiliates, ads, storage and returns — with every rate dated and editable. No sign-up, nothing uploaded.
Free Amazon FBA Calculator
Full-stack FBA profit: referral, fulfillment by size tier and DIM weight, fuel and peak surcharges, storage, ads and returns — the costs other calculators skip.
Open toolFree TikTok Shop Calculator
TikTok Shop profit with the real fee base: referral on the discounted price, affiliate commissions, samples, ads and refund costs — 6% default, editable.
Open toolFree Etsy Fee Calculator
Every Etsy fee counted: the $0.20 listing fee, 6.5% transaction, payment processing, the regulatory fee, and Offsite Ads — plus the exact list price that protects your target profit.
Open toolFree Amazon Reverse Pricing Calculator
Work backwards: enter your costs and a target margin, ROI or profit and get the minimum Amazon price that hits it — through every referral band and cliff.
Open toolFree Break-Even ACoS Calculator
Break-even and target ACoS, ROAS and max CPC from your real pre-ad profit — for Amazon Ads and TikTok Shop / GMV Max.
Open toolFree FBA vs FBM Calculator
FBA or fulfil it yourself? Side-by-side per-unit profit with your own shipping, packaging and handling time counted honestly.
Open toolFree TikTok Affiliate Commission Calculator
The highest creator commission you can offer and still hit your margin — plus a creator mode that estimates earnings after refunds.
Open toolFree Dimensional Weight Calculator
DIM weight, billed weight and Amazon size tier from your box dimensions — ÷139 for Amazon, ÷166 for TikTok FBT — plus box-shrink savings.
Open toolFree Amazon Storage Fee Calculator
Monthly FBA storage by season, the Q4 spike, and the aged-inventory surcharge that starts at day 181 — per unit and per month.
Open toolFree FBT vs Self-Ship Calculator
Fulfilled by TikTok or your own labels? Compare per-order profit with dated FBT placeholder rates or your own pasted rate.
Open toolFree Inventory Reorder Point Calculator
Days of supply, safety stock, reorder point and order quantity, plus inventory turnover — the spreadsheet maths, without the spreadsheet.
Open toolFree Amazon vs TikTok Shop Calculator
One product, four channels: Amazon FBA, Amazon FBM, TikTok self-ship and TikTok FBT — net profit and margin side by side.
Open toolFree Returns Cost Calculator
What returns really cost per unit sold: refund admin fees, lost fulfillment and shipping, and unsellable stock — Amazon and TikTok rules side by side.
Open toolFree eBay Fee Calculator
Final value fees by category, the per-order fee, promoted listings and returns — your real net and profit on every sale.
Open toolFree PayPal Fee Calculator
Goods & Services, Checkout, QR and micropayment rates from PayPal’s official fee table — plus what to charge to receive a target amount.
Open toolFree Stripe Fee Calculator
2.9% + 30¢ domestic, international-card and currency-conversion fees — forward, reverse and effective rate.
Open toolFree Marketplace Profit Comparator
One product, four marketplaces: net profit per sale ranked across Amazon FBA, TikTok Shop, Etsy and eBay.
Open toolThe True Cost of Selling on Amazon vs eBay vs Etsy vs TikTok Shop
One product, four marketplaces, every fee counted: at $29.99 the engines keep $11.87 on Etsy, $10.69 on eBay, $8.48 on TikTok Shop and $6.85 on Amazon FBA.
Open toolSeller calculators that show their working
Marketplace fees are where small sellers bleed quietly: a referral percentage applied to a base nobody explained, a fulfillment fee set by a box dimension nobody measured, a refund that returns the fee minus a cut. The official calculators omit the lines that hurt — advertising, returns, placement, storage — and independent analyses put the resulting overstatement at 15–40% of profit. Every tool in this section exists to close one of those gaps, with its fee schedule dated on the page and its rates editable, because a calculator that hides its assumptions is just a rumour with a form attached.
Start with the two profit engines: the Amazon FBA Calculator runs the full 2026 Amazon stack, and the TikTok Shop Calculator models TikTok's discounted fee base, creator commissions and refund maths — defaulting to the official 6% referral rate and labelling the widely reported 8% figure as what it is: unverified. Around them sit the solvers and comparisons sellers actually argue about: the price a target margin demands, the ACoS a product can survive, FBA against your own fulfilment, the commission ceiling for creators, and what returns truly cost on each platform.
Everything runs in your browser. Your product costs, margins and supplier numbers are your business — they are never sent anywhere, and there is no account to create.