There is no official way to see your MMR in LoL. For now you can only guess a certain range by keeping an eye on the LP distribution after ranked games. Some websites offer a service that gives out a general idea for players.
Can you check normal MMR league?
Although you cannot publicly see your normal game rank, it is determined by MMR. If two people played 100 ARAM games each, but person A won 40 games, while person B won 60 games, Riot will match person B with stronger players.
How do you know your MMR rank?
There is no official way to check your MMR. However, you can partially figure it out from how LP points are distributed after the end of a ranked game. The easier way to see your MMR is to use a service that pulls data from the API. WhatismyMMR is one of these sites and it offers a decent view of your MMR.
Does Deathmatch have MMR Valorant?
Warming Up. When players win VALORANT Deathmatch games, they do not receive extra experience or a better MMR. This makes for a fun game mode without any worries about downranking or breaking win streaks. In fact, this mode makes for a great warmup when preparing for ranked or unrated games.