Reseller ROI calculator
Return on investment is profit measured against what you risked. Add the holding time and two very different flips become directly comparable.
Why the days-held field changes everything
A 50% ROI sounds better than 10% — until you learn the 50% took a year and the 10% took a week. Annualized, the weekly flip is running at over 500% a year while the slow one sits at 50%. Speed is the quiet variable in reselling: money tied up in a slow item is money that cannot be buying the next fast one.
The annualized figure here is the simple version — profit rate scaled to a year — not compound growth, and no real-world flip repeats perfectly. Treat it as a comparison tool between your own purchases, not a promise. It is extremely good at one specific job: telling you which kinds of items deserve more of your sourcing budget.
Enter the after-fee payout, not the sticker price, or every number that follows is fiction. The platform calculators on this site give you that payout figure.
Questions
Should I use the sale price or the payout?
The payout — what actually reached your account after fees and any shipping you paid. Using the sale price inflates ROI on exactly the platforms with the highest fees, which is the opposite of what you want to know.
What is a good ROI for flipping?
Sourcing-dependent, but the more useful question is ROI per month of holding. Many resellers happily take a modest ROI that turns over in days and avoid spectacular ROI that takes a year — the fast one compounds through repetition.
Why is my annualized number absurdly high?
Short holds scale to enormous annual rates — a 10% gain in three days annualizes past 1,200%. It does not mean you will actually earn that over a year; it means that class of flip uses your money very efficiently while it lasts.