Free profit & fee calculator for Canadian resellers — know what you actually keep after fees, shipping, and HST on 8 selling platforms.
Live: https://waderossjasonfleming-cmd.github.io/flipmath/
- Where to sell — net profit side-by-side on eBay.ca, Facebook Marketplace (shipped and local pickup), Kijiji, Poshmark Canada, Etsy Canada, Vinted Canada, and Depop
- What to pay — maximum buy price for your target margin, before you overpay at a yard sale
- Break-even & ROI — the real number, with HST/GST on fees included (the part most calculators skip)
US fee calculators are wrong for Canada. The "5% Facebook fee" quoted everywhere is an American number — Canadian sellers pay 10% shipped (min $0.80), $0 for local pickup. Poshmark CA charges 20% + GST/HST on the fee itself. These differences turn "great deal" into "silent loss."
All rates verified October 18, 2026 from the platforms' own fee pages. When they change, the site gets updated.
A printable one-pager: the max-pay formula, 10 category price targets (tools, consoles, LEGO, board games, clothing...), and the fee quick-reference.
→ https://waderossjasonfleming-cmd.github.io/flipmath/cheatsheet.html
A one-time $9 Pro version adds batch sourcing (paste a whole list, get max buy prices), an inventory P&L tracker with CSV export for taxes, editable fee rates, and a printable fee sheet. Single HTML file, works offline, no subscription, no account.
→ https://wadeross.gumroad.com/l/jfrxk
Zero dependencies. One HTML file. No trackers, no analytics, no cookies — everything runs in your browser. DOM-safe rendering (no innerHTML), tested fee engine (37 unit tests), works on any phone or laptop.
Fee data is estimates — platforms change rates; always confirm current fees. Not affiliated with any platform.