Last verified: 2026-09-18 · Reverse of locked hub formulas only · planning only · not a payout
Target keep $ → list · or COGS + keep → offer floor / min list
Enter the net KEEP $ you want after fees — or switch to offer-floor / min-list with COGS + optional seller shipping so the solved list covers cost + target keep. Etsy, eBay, Poshmark, Mercari, Depop, and Shopify Basic Payments. Same locked hub math as the forward KEEP tools (verify on $100 below). No invented fees.
Forward check on $100: Etsy $90.05 · eBay $86.00 · Poshmark $80.00 · Mercari $90.00 · Depop $96.25 · Shopify Basic Payments $96.80.
Min list covers COGS + ship + target KEEP using the same reverse solvers as Target KEEP → list. Target KEEP $0 = true no-loss floor.
2. Table below → solved list price per marketplace. Default $80.00 → Poshmark list $100.00 (US 20% lock). Change the target to re-solve all six. Shareable ?keep=.
| Platform | Locked formula | Solved list price | Forward KEEP @ $100 |
|---|
| Platform | Formula | KEEP on $100 |
|---|---|---|
| Etsy | 9.5% + $0.45 (listing $0.20 + 6.5% txn + Payments 3%+$0.25) | $90.05 |
| eBay | 13.6% + $0.40 (most categories, no Store) | $86.00 |
| Poshmark | US 20% at $15+ · flat $2.95 under $15 | $80.00 |
| Mercari | 10% seller fee | $90.00 |
| Depop | US 0% selling + Payments 3.3%+$0.45 | $96.25 |
| Shopify Basic Payments | Basic SP domestic 2.9%+$0.30 | $96.80 |
|
Own store KEEP $96.80 on $100 — Start Shopify (Impact · FTC)
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You type the net KEEP $ you want after fees. This page solves the list/sale price each locked hub formula needs so KEEP lands on that target. Planning only — confirm on linked KEEP hubs.
Enter COGS (item cost) plus optional seller shipping/label and a target KEEP / profit. Min list = reverse solve so hub KEEP covers COGS + ship + target. Same locked inverses as Target KEEP → list (FlipCalc-style offer floor). Target KEEP $0 = true no-loss floor. Planning only.
Yes. Forward check on $100: Etsy $90.05 · eBay $86.00 · Poshmark $80.00 · Mercari $90.00 · Depop $96.25 · Shopify Basic Payments $96.80. Reverse solvers are the algebraic inverse of those same locks.
Etsy, eBay, Poshmark (US 20% at $15+; flat $2.95 under $15), Mercari, Depop, and Shopify Basic Payments only — no invented platforms or fees.
Citeable $25/$50/$100/$250 KEEP: exact-answers. Full ladder: fee-index. Live ranker: compare. Planning only.
Not affiliated with Etsy, eBay, Poshmark, Mercari, or Depop. Shopify Impact link disclosed when used. Educational planning only.