The Matchmaking Rating (MMR) is a mechanism used in the League of Legends (LoL) to set the ranking of your players. The MMR, however, is not a visible value to the end user. In this way, many players have doubts about how the MMR works and how its calculation is done. Understand, then, a bit more about the ranked game system in Riot Games.

Understanding LoL MMR

The MMR is a value generated from the results of the matches and seeks to put the players in matches compatible with their abilities. The number defines how many League Points  a user wins or loses after playing.

After finishing the initial series of best of ten matches (BO10), the game will set an MMR. This value will put the user in a ranked league. If a player has above-average MMR for his league he will earn more point by winning his matches. On the other hand, if he is below, he will earn less when he wins the games. The same goes for defeats: he will lose more points if he is with MMR below and if he is with MMR high, he will lose less because the system notices that he is in a level of gameplay above his average.

Understand the Calculation of MMR?

Riot does not disclose the mathematical calculation behind the MMR and neither the MMR of each player. Some unofficial services, however, seek to indicate this number. The OP GG site, for example, makes an estimate of what your MMR is. The value can tell you if you need to be more cautious in ranking: if your number is below the tier to which you belong, be careful! . According to the developer, there are four means of MMR change in the game:

When You Win:

Your team’s average MMR is larger than the enemy’s: You earn a normal amount of MMR. Your team’s average MMR is less than the enemy’s: you get more MMR than normal.

When You Lose:

Your team’s average MMR is less than the enemy’s: you lose less MMR than normal. Your team’s average MMR is larger than the enemy’s: you lose more MMR than normal.

MMR in LoL

MMR divisions

As stated before, Riot does not disclose the average MMR numbers for each league, but there is an estimate made by unofficial websites and forums. According to the developer, there are ways to skip division or be promoted league without having to play the best of three matches (BO3), but this is rare and the MMR needs to be very high for such a feat. The MMR is divided into 6 tiers: Bronze, Silver, Gold, Platinum, Diamond and Challenger. Each of tier is further divided into 5 divisions.

Recalling that the Challenger league is a level above Diamond 1 and no longer uses the League Points as a promotion, but rather as ranking between the league.