This list is based upon a system called Equivalent Album Sales (EAS). This takes into account multiple facets of an album’s success beyond simply physical copies sold, and helps to show a more complete look at the best performing albums of all time.

Conversion ratio between formats:
Studio album: sales of the original album (ratio 1/1)
Other LPs: sales of compilations generated thanks to the album (ratio 1/1)
Physical singles: sales of physical singles from the album (added to CSPC total with a ratio 3/10 for 2-tracks, 5/10 for EPs and Maxis)
Digital singles: sales of digital singles from the album (ratio 1.5/10 for CSPC total)
Streaming: EAS of all the album tracks (ratio 1/1500 for Audio stream and 1/6750 for Video stream)

Source: https://chartmasters.org/



0:00 100-76
2:43 75-51
5:27 50-26
8:10 25-1