Helpful Toolbox

Reseller Profit Calculator

See what a flip really nets you after platform fees, shipping, and supplies — net profit, margin, ROI, and your break-even price, updated live as you type.

📖 How it works & FAQ

Know your real profit before you list

Flipping looks profitable until the fees land. A $10 thrift find that sells for $35 sounds like a $25 win, but after a 13.6% platform fee, a fixed transaction fee, $5 of shipping, and a poly mailer, the real number is much smaller. This calculator does that math instantly: enter your buy price, expected sell price, platform fee percentage and fixed fee, shipping, and supplies, and it shows your net profit, profit margin, and return on investment, plus the break-even sell price where you would walk away with nothing. Everything runs in your browser and nothing is uploaded anywhere.

The platform presets are approximate default fee figures you can edit; platforms change fees often and rates vary by category and seller level, so check your platform's current fee page. All results are estimates only, not financial advice.

How to use it

  1. Pick a platform preset, or choose Custom and type your own fee percentage and fixed fee — editing either fee field switches you to Custom automatically.
  2. Enter what you paid for the item (buy price).
  3. Enter the price you plan to sell it for.
  4. Add shipping cost (if you cover it) and supplies like mailers, boxes, or tape.
  5. Read the results — they update live, so drag the sell price up and down to test different price points before you list.

FAQ

What is the difference between margin and ROI?
Margin is profit as a share of the sale price — how much of each buyer dollar you keep. ROI is profit as a share of the cash you put in (buy price plus shipping plus supplies) — how hard your money worked. Flippers usually care more about ROI; a $5 item netting $10 is a 200% ROI even at a modest margin.
Should I include shipping if the buyer pays it?
If the buyer pays the carrier directly, set shipping to zero. If you offer free shipping and eat the label cost, enter it — and remember most platforms charge their percentage on the shipping you collect, too.
Do the presets include payment processing fees?
Roughly, yes — the defaults blend the selling fee and typical payment processing into one percentage plus a fixed amount. For exact numbers, edit the fields to match your latest sales receipt.
What counts as a good flip?
Many resellers target at least 100% ROI and a $10+ net profit per item so their time is covered. Use the break-even card as your floor when accepting offers.