MMR (matchmaking rating) is the hidden number Riot uses to decide who you play against. Your visible rank — Gold II, 57 LP — is a presentation layer on top of it. Matchmaking ignores the badge and matches you by the number.
MMR vs. your visible rank
The two usually track each other, but they drift apart: after a loss streak, a break, or a fresh placement, your MMR can sit well above or below your rank. The system then uses LP gains to pull your rank back toward your MMR — that's the whole trick behind "LP gains".
Why your LP gains change
Gaining more LP for a win than you lose for a loss means the system thinks you belong higher than your current rank, and it's accelerating you upward. Losing more than you gain means the opposite. Stable +25/-25 means your rank and MMR agree.
Why no site can show your real MMR
Riot doesn't expose MMR through its API — at all, to anyone. Every "MMR checker" you've seen is estimating from visible data like rank and LP changes, and Riot's developer policies explicitly prohibit presenting those estimates as real ratings. That's why our tools show you what's actually knowable: your rank, your LP math, and how many games your climb takes.
What actually raises MMR
Winning. Nothing else — not KDA, not vision score, not honor. Win more than you lose against players at your level and both your MMR and, with a small delay, your rank will climb. Dodging doesn't lower MMR (only LP), and remakes barely count.
Frequently asked questions
Does MMR reset between seasons?
It gets softly squished toward the middle rather than wiped — which is why placements after a reset put high-MMR players back near their old spot within a handful of games.
Is duo queue bad for my MMR?
Duoing doesn't change how MMR moves, but duos face slightly harder opponents on average, so win-trading your way up is harder than it looks.
How do I check how many games my climb takes?
That part is real math on visible numbers — our climb calculator does it from your rank, winrate and LP gains.