Free tools for resellers and flippers
Know what you keep before you buy it, list it or mark it down.
Four calculators for thrift, garage-sale and clearance flippers: what one item nets on eBay, Poshmark, Mercari, Depop and Facebook side by side, the most to pay for it, what your time really earns, and how far to drop a stale listing.
No sign-up. Runs in your browser. US seller fees checked Oct 3, 2026 against each platform’s own fee page.
Example: $40 jeans, $8 shipping, $6 cost
- You keep
- Depop$32.07
- Mercari$29.30
- Facebook, shipped$29.30
- eBay (most categories)$27.17
- Poshmark$25.60
- Gap between best and worst$6.47
$7.50 label and $0.40 packaging, no sales tax, no ads or boosts. With 8% buyer tax, eBay drops to $26.65.
Four questions, four tools.
Bin 1Which platform pays most?Fees, payout and profit on six ways to sell, with fees on tax and shipping counted where they apply.Compare platforms →
Bin 2What’s the most I can pay?Your max buy price for a target profit or ROI, plus break-even, on every platform.Max buy price →
Bin 3Is this worth my time?Real profit per hour once sourcing trips, mileage, listing and packing are counted.Profit per hour →
Bin 4How far can I drop it?A markdown schedule for stale listings that stops at your minimum profit.Markdown plan →
Built from what sellers keep saying.
Before building anything we read through reseller threads. The same few complaints came up again and again, and each one has a tool here.
eBay charges you their fee ON TOP of the buyer’s sales tax, so you end up paying quite a bit more than the advertised fee.
r/MercariPut the tax rate in Compare and watch which fees move.Seriously Mercari, why am I paying 10% on the shipping the buyer is paying?
r/MercariEvery fee line in Compare says what it’s charged on.when bidding, I try to not go over 30% of what I can sell it for
r/FlippingMax buy shows where your item really lands as a share of the sale price.small flips are fun until you’re spending an hour chasing a $10 profit.
r/FlippingProfit per hour counts the driving and sorting too.
$4 spreadsheet
Tracking more than one item?
The tools here work one item at a time. The Reseller Inventory & Profit Tracker is a spreadsheet for your whole inventory, from the same maker.
- An inventory log for up to 1,000 items: log the buy, and when it sells it works out fees, payout, profit, ROI and days to sell
- Editable fee table for eBay, Poshmark, Mercari, Depop, Whatnot, Facebook and local sales, with spare rows for your own
- Expenses with sourcing mileage, a one-item Quick Compare, and a dashboard by month and platform
- Flags unsold items older than your stale limit and shows the cash tied up in unsold stock
- Excel and Google Sheets, no macros. Example and blank workbooks plus a quick-start guide