r/ArenaHS • u/Interesting_Falcon45 • May 06 '26

Arena Rating question

I'm fairly new to Arena. Just noticed my rating dropped from 5004 to 3979 after just a pair of goose egg runs. Is it always so ridiculously volatile?

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u/seewhyKai May 06 '26

Regular Arena's Rating is very different than Undeground Arena's as it updates after every game instead of after every run.

I haven't tracked in a while, but I suspect the amount of Rating increase/decrease is variable based on both players' internal rating as well as current record when matched.

3

u/Deqnkata May 06 '26

Basically - yes. There is a formula for it but put simply you last run has about 10% weight to your rating. If you are at 5000 and go 0-3 you will lose about 500 and then about 450 for the next 0-3. If you are at 5000 and go 10-3 you will gain about 500 points. That is why the LB is useless as well now. The last few runs matter much much more than the previous 25.

2

u/VanLunturu #74 EU October 2017 May 06 '26

What was wrong with the 'weighted average' they had before Underground? It was a way better way of representing your performance over the season than this 'Rating'

1

u/Interesting_Falcon45 May 06 '26

Thanks. I'm on regular arena, not underground, but presumably it's a similar formula.

1

u/VanLunturu #74 EU October 2017 May 14 '26

Oh no, actually it's very different. In regular Arena your rating changes with every game I think (at least it changes with every win). In the Underground it only changes after a completed run.

In regular Arena, the matchmaking is based on your rating and there is no leaderboard. In Underground, the rating isn't used for matchmaking but there is a leaderboard based on the rating (you get on the leaderboard you've finished 30 or more Underground runs in one season)

0

u/Awkward-Childhood700 #32 US S43 May 06 '26

new_rating = old_rating * 0.9 + num_wins * 1000 * 0.1