Free Reseller Tools

Free calculators for eBay, Poshmark, Depop, Mercari, StockX and more resellers. No signup. Instant answers.

Profit
Resale Profit Calculator
Real profit after platform fees, shipping, and all costs — across eBay, Poshmark, Mercari, Depop, StockX, and more.
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eBay
eBay Fee Calculator
Final value fee by category, promoted listing cost, and net payout. Know exactly what eBay takes before you list.
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Poshmark
Poshmark Fee Calculator
Poshmark takes $2.95 flat under $15 and 20% above. See your exact earnings and profit for any listing price.
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ROI
ROI Calculator
ROI %, money multiple, and annualised return for any resale flip. Compare deals with the same metric.
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Tax
Tax Estimator
Estimate self-employment tax, income tax, and monthly set-aside based on your reselling income and expenses.
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Bulk Lots
Lot Splitter
Cost per item, profit at sell-through rate, and break-even point for any thrift haul or estate sale lot.
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Why resellers need these tools
The numbers that actually matter.

Most resellers underestimate their costs. Platform fees stack — eBay charges differently by category, Poshmark flips from a flat fee to 20% at $15, and promoted listings add another layer on top. One wrong assumption turns a profitable flip into a wash.

ROI tells you more than profit ever can. A $20 profit sounds good until you realise you had $200 tied up for 60 days. ROI and annualised return show you which flips are actually worth doing — and which sourcing channels deserve your time and capital.

Tax surprises destroy resale businesses. Self-employment tax alone is 15.3% on top of income tax. Resellers who don't track and set aside money quarterly often owe more than they have — and can't pay it. Know your number before April, not during it.