Airplay - 35%
Sales - 60%
Online stream - 5%
for airplay you multiply the audience impressions by 0.35, and you get the answer
digital, you multiply the sales amount by 0.60, and get the answer
idk how they count online stream. but yeah.
say for example a song has 64 audience impressions = 22.4
and then 145,000 digital sales in a week = 87.0
add those and total points = 109.4
and then that's how they compile the charts.