How BB Hot 100 is calculated ?

looking at how kpop songs are ranked i'm confused

As an example, let's look at this week's predictions.

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#27 Perry Corno " Its beginning to look a lot like christmas"

0.2K sales : 0%

18.3M streams : 93%

7M AirPlay : 7%

But he ends up with 120.4K units

#37 Kendrick Lamar " Not like us "

1.5K sales : 1%

13.9M streams : 73 %

25.5M AirPlay : 26 %

91.2K units

First of all, how do you get 93% with 18.3 million streams and only 73% with 13.9 million?

This doesn't make sense because #1 All I Want For Christmas only got 89% with 46.8 million streams.

Can someone explain?

Second, airplay is miscalculated...and I don't even want to talk about sales.

it seems that having good streams is enough to rank well.

And finally, what do the points correspond to?

what does woc mean?

Quote from Kitty_Saurus

WOC means week on charts

Premium and free streams have different computations. I'm assuming that the first one has higher premium streams from platform such as Apple Music.

Premium?

ok, and what do the points correspond to?

So we won't have more information about the data measurement bases. These are just results of data made by themselves.

And I thought I could do my own math. Yeah, bad idea.