How does the Billboard chart work?

[r0bert]

I'm from Europe and don't quite understand how it works...

Take for example this for JoJos latest track:

145 JOJO Too Little Too Late 31 0 31 0.244

145=Her position in the chart
31= radio plays
0=?
31=?
0.244=audience?

[EvanJ]

First of all, it looks like you got your information from www.mmr247.com/mmrweb/AllAccess/Charts.asp?format=H1R&cutoff=0&showtopn=2000&showyear=y&dpt=n (or another page with some different coulmn headings) which is a Mediabase chart used by Radio and Records (www.radioandrecords.com), not Billboard. Radio and Records and Billboard have different radio station panels.
0 = plays last week
31 = play increase or decrease this week (in this case an increase)
Your other guesses are correct.

[r0bert]

ah great, thanks Evan :)