The EAS ratio is specific for every artist. It reflects his equivalent album sales thanks to on-demand audio streams across all platforms, like Apple Music, Amazon Music, Deezer, Anghami, etc. The algorythm first uses the artist top 50 cities on Spotify to know where his streams are coming from, with adjustments made based on the artist music genre. Then, it applies the market share of Spotify country by country to accurate gauge streams on remaining streaming platforms. This provides market-comprehensive streaming numbers, which are ultimately divided by 1,500. The 1,500 division factor reflects the industry-accepted ratio between 1 album sale and 1,500 streams. You can read more about format conversions with explanations on our Commensurate Sales to Popularity Concept.