Why we built this
Most cross-border e-commerce operators run their numbers in spreadsheets they copied from a YouTube tutorial three years ago. The spreadsheets still mostly work, but they're missing the new fees, the new size tiers, and the new fulfilment math. A single forgotten line item — a transaction fee, a creator commission, a peak-season storage surcharge — can turn a "profitable" SKU into a money-losing one.
SellerCalcs exists to close that gap. It is a focused, opinionated toolkit of free calculators and AI helpers built specifically for cross-border sellers on TikTok Shop, Shopify, and Amazon. Each tool does one job, runs entirely in your browser, and shows its work — so you can edit the numbers, trust the output, and move on.
What we believe
- Free should mean free. No login, no email gate, no "upgrade to view results" paywall. Every tool returns full output on the first run.
- Your numbers are yours. Every calculation runs in JavaScript in your browser. Nothing is sent to a server. Refreshing the page clears every input. You can use these tools on a coffee shop laptop without leaving sensitive pricing data behind.
- Specificity beats generality. A generic "profit calculator" doesn't help when TikTok Shop, Shopify, and Amazon have completely different fee structures. We build channel-specific tools that know the actual 2026 rates.
- Defaults reflect reality. Every input has a sensible default based on current fee schedules. You don't have to know the fees to use the tools — but the breakdown shows them, so you can learn.
- Tools, not platforms. We are not trying to replace your Shopify store, your accounting software, or your forwarder. We are the calculator beside them.
How we make money
SellerCalcs is funded by display advertising (Google AdSense) and by occasional affiliate referrals when a tool legitimately recommends a service we use ourselves. We never sell user data — there's no user data to sell, since nothing is collected. We never put a paywall between you and a calculation. If a tool starts to chase revenue at the expense of usefulness, we expect users to tell us, and we'll fix it.
Who builds this
SellerCalcs is an independent project run by operators who have priced products on Shopify, sold on Amazon and TikTok Shop, and shipped containers from Shenzhen to LAX more times than we'd like to admit. We build the tools we wish existed when we were starting out — and the tools we still use today.
If you have feedback, a calculator you wish existed, or a fee schedule we should update, drop us a note. We read every message.
What we'll never do
- Send marketing emails (we don't collect emails).
- Show pop-ups, exit-intent overlays, or "you've been here 30 seconds" interruptions.
- Auto-play audio or video.
- Place ads inside calculator results or above tool inputs.
- Recommend a paid service in tool output unless it's clearly the right answer for the calculation.
What we'd love feedback on
If you'd like to help us prioritise what's next, tell us:
- The calculation you run weekly that doesn't have a free tool.
- The fee schedule that changed and broke your spreadsheet.
- The platform we should add next — Walmart Marketplace, eBay, Lazada, Shopee, MercadoLibre.
- The language we should localize to first.
Thanks for using SellerCalcs. Now go price something correctly.