Various embodiments include a method and system for a seller conversion factor to ranking score for presented item listings. In an online marketplace with sellers and item listings, a first sum may be calculated by identifying a first set of item listings associated with the seller. A second sum may also be calculated by identifying a second set of item listings, where the second set is a subset of the first set and are successful item listings. Further, a conversion factor may be calculated from the first and second sums by dividing the second sum by the first sum. The conversion factor may then be used as a component in an item listing quality score for a third set of item listings associated with the seller.