Free tool
Reseller Profit Calculator
That $1 find only pays if the numbers do. Enter your marketplace’s fees and your real postage to see what you keep.
The numbers that sink most book flips
- Postage creep. Heavy hardcovers and textbooks can cost more to ship than the buyer’s shipping credit covers. Weigh before you list.
- Fees on shipping. Many marketplaces charge their percentage on the total including shipping, not just the item price.
- Slow sellers. A book that takes a year to sell ties up space and cash. Prefer titles with steady demand.
- Returns and condition disputes. Grade conservatively; one return can wipe out the profit on several sales.
A common rule of thumb among resellers is to pass on books that won’t clear a few dollars of profit after every cost — the calculator flags those as thin. For sourcing ideas see Book scouting 101.