What Is MMR?
MMR stands for Matchmaking Rating. It's a hidden number that Riot Games assigns to your account to measure your actual skill level in League of Legends. You can't see it anywhere in the client, but it's the single most important value on your ranked account.
Think of it this way: your visible rank (Gold 3, Emerald 1, etc.) is like your job title. Your MMR is your actual performance review. Sometimes they match up, sometimes they don't.
How Does It Work?
The basic idea is straightforward: win a game and your MMR goes up. Lose and it goes down. But there are some important details.
Not All Wins Are Equal
If you beat a team with higher MMR than yours, your MMR increases more than usual. If you lose to a team with lower MMR, it drops more. The system takes the expected difficulty of each match into account when adjusting your rating.
Each Queue Has Its Own MMR
Your Solo/Duo MMR is completely separate from your Flex MMR and your normal game MMR. You can be Diamond in Solo/Duo and have Silver-level MMR in Flex without one affecting the other. That said, when you first start playing ranked, the system uses your normals MMR as a starting point.
MMR Decides Who You Play Against
Riot doesn't match you based on your visible rank. It matches you based on your MMR. That's why you sometimes see Emeralds in games with Platinums or Diamonds: their MMRs are closer than their ranks suggest.
Why Is MMR Hidden?
Riot has explained multiple times why they don't show MMR directly. The main reason is they want players to focus on improving their gameplay, not on optimizing a number. If MMR were visible, every loss would feel like a direct hit to your "real score," which would create more frustration and tilt.
On top of that, showing the exact MMR would make the visible rank system pointless. Why have Gold, Platinum, or Emerald if you can just see your number directly?
The Relationship Between MMR and LP
This is where everything connects. The amount of LP you gain or lose after each game depends on the gap between your MMR and your visible rank:
- MMR higher than your rank: you gain more LP per win and lose less per loss. The system wants to push you up.
- MMR aligned with your rank: you gain and lose similar amounts (around 20-22 LP).
- MMR lower than your rank: you gain less LP and lose more. The system wants to pull you down.
If you're gaining +15 and losing -25, your MMR is below your rank. If you want to understand this better and learn how to fix it, check out our full guide on why you lose more LP than you gain.
Common MMR Myths
"I Can Calculate My Exact MMR"
No. Riot doesn't share your MMR with anyone, not even through their public API. Any website that gives you an "exact MMR number" is making an estimate based on indirect data. These estimates can give you a general idea, but they're not the real number. Riot's policies explicitly prohibit creating alternatives to their official ranking system.
"Dodging Lowers My MMR"
False. Dodging a game costs you LP and gives you a queue timer, but it doesn't affect your MMR at all. In fact, dodging games that look lost from champion select can protect your MMR at the cost of a few LP.
"I Need a New Account to Fix My MMR"
Not necessarily. If your actual skill level improves, your MMR will climb over time. A fresh account starts with calibrating MMR and has high LP gains, but if you play at the same level, you'll end up in the same place.
How to Improve Your MMR
There are no shortcuts. The only way to raise your MMR is to win more than you lose consistently. Some practical tips:
- Shrink your champion pool to 2-3 picks and master them. More consistency means more wins.
- Play during your best hours. Check the Best Time to Play tool to find when matches tend to be more balanced.
- Stop playing on tilt. Every loss while tilted is free MMR you're giving away. The Tilt Detector can warn you when your performance is dropping.
- Focus on improving, not the number. Ironically, the best way to raise your MMR is to stop thinking about it and focus on playing better each game.
Your MMR is a reflection of your real level. If you focus on getting better as a player, the number takes care of itself.