TOP
・BPIとは
BPI
Beat Power Indicater

・BPI is an indicator for evaluating IIDX skill, especially for skilled players.
*0 point in BPI is kaiden-average.
*100 point is world record (on PENDUAL).
・This is originally made for evaluating top-rankers.
・Calculation method is a little bit complicated.
(http://norimiso.web.fc2.com/about.txt detail is shown here, though Japanese.)
(if needed, I'll try to translate into English.)
・I recommend for those who want to know how good my score, which exceeds AAA, is.
・0 point in BPI means roughly top 2000, because there're about 4000 kaidens in IIDX(SP)
・10 for top 1000, 20 for top 500, and so on.
・You can use this if you want to know a song's kaiden-average and world record.
*but if world record is MAX, BPI cannot calculate properly.
*you can know Lv.12's kaiden-average and world record below URL
http://norimiso.web.fc2.com/1/bpitable.html (simple BPI table)
(0 for kaiden-average, 100 for world record)
・Originally, there're overall BPI, which is calculated from BPI of all lv.12 songs
*overall BPI can express one's proficiency numerically.
*overall BPI is not mere arithmetic mean.
(if you want to know detail, also shown in above URL.)
・I know this website is really cheap, but I don't have any programming skills, so this is my limit.

for example. IIDX-ranker BPI table on SPADA.
http://p.twpl.jp/show/orig/1magS