Sell-through rate calculator
Sell-through rate is sold divided by listed. It is the closest thing reselling has to a report card, because it grades the decision you actually control: what you chose to buy.
What the number is telling you
A low sell-through with good margins means you are picking desirable items but slowly drowning in the ones that miss — storage fills, cash sits, and the winners subsidize a growing pile. A high sell-through with thin margins means buyers want what you source and you can probably charge more. The two failure modes feel completely different day to day, and the fix for one is the opposite of the fix for the other, which is why this number is worth tracking at all.
Add the time window and the calculator scales your rate to a 30-day equivalent, which makes a two-week experiment comparable with a quarterly review. Consistency matters more than the exact convention — measure the same way every time and watch the trend, not the single reading.
The classic use: run the rate separately per category or per sourcing spot. An overall number hides the fact that your electronics fly and your books rot. Split the number and your next sourcing trip makes itself.
Questions
What is a good sell-through rate?
Depends on category and price point — fast fashion moves differently from collectibles. The more useful benchmark is your own trend line, and the comparison between your categories, which tells you where to put your sourcing money next.
Should I count relisted items twice?
Pick one convention and keep it. The simplest honest version: count unique items listed in the window, and count an item as sold if it sold in that window regardless of relists.
My rate is low. Lower prices?
Maybe — but low sell-through is more often a sourcing signal than a pricing one. Before cutting prices across the board, check which categories drag the number down and stop buying those.