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, multiple-item item listings within fixed-price listings can be identified. The multiple-item item listings can each offer for sale a plurality of equivalent items and the multiple-item item listings can be a subset of item listings corresponding to a seller. An aggregate sales value can be calculated for each of the multiple-item item listings by identifying the number of sales corresponding to a multiple-item item listing. An impressions value can be calculated for the multiple-item item listings. An aggregate sales factor can be calculated using the aggregate sales value and the impressions value. The aggregate sales factor can be used as a component in an item listing quality score for some item listings of the seller.