How Competitive Matchmaking and Ranking Works (Season 28+)

[Kaawumba-1133]

@Bob-111980

It never occurred to me to post here. but can we have the MMR to SR spectrum? Its pure math and should not be up for debate.

MMR -3 being SR 0, and 3 being 5k?
And with standard deviations of notches in between.

@Kaawumba-1133

That is, 99.74% of the population is between -3.0 and +3.06. -3.0 is in low bronze, and +3.0 is in high GM. Do not freak out about MMR being stored in standard-deviations. It could be stored in any other scaling without affecting matchmaking.

Blizzard hasn’t given an exact conversion between SR and MMR. Zero MMR is approximately 2350 SR (which is where new players start out, Initial Competitive Skill Rating, Decrypted)

We can approximate that 1 MMR is about 833 SR (5000/6), but we don’t know exactly.

There is also tweaking at the edges to prevent people from getting maximum or minimum SR. SR just isn’t displayed below 500. And as you get close to 5000, there is an SR debuff, that is unlikely to effect MMR:

@ScottMercer

Is your current SR really high? Your SR increases less on a win than it decreases on a loss as your SR approaches the systemic limit of 5000.