Power level

Power level also known as Splatfest Power, League Power or X Power is a feature introduced at version 2.6.0 in Splatoon that replaces the vibe meter during Splatfest.

The concept of power level has also been extended in Splatoon 2 to apply to X rank in Ranked Battles and League Battles, and works similarly to how Splatfest Power works.

Description
The Power rating is a Glicko-2 rating system. Only wins and losses are considered when measuring performance in battles, meaning that splats, getting splatted, turf coverage and playing the objective don't count towards the Power rating. The opponents Power rating are put together to a single value and used when calculating a new value for the player. In addition to rank, and power, players also have a rating deviation (RD) number for each mode that is never exposed to the players.

Splatfest Power
At version 2.6.0 in Splatoon, a feature was added to Splatfests that replaces the vibe meter to a Splatfest Power meter.

In Splatoon, Initial Splatfest Power level depended on player's current Ranked Battle rank.

At version 2.7.0, the initial Splatfest power of player's who were in rank S+ was changed from 1600 to 1700, also the initial Splatfest power of players below level 10 was changed from 800 to 1000. In Splatoon 2, the initial Splatfest power is based on 10 calculation matches.


 * Splatfest Power level will change depending on wins or losses during Splatfest Battles.
 * The player with the highest Splatfest Power in a team will gain slightly bigger amount of points.
 * Players were previously matched up based on playstyle, but will now be matched up with players with similar Splatfest Power.
 * More Splatfest Power will be gained after a match if the opposing team had the higher average Splatfest Power.
 * In Splatoon, At the top left corner of the box showing the player's Splatfest Power is a pair of eyes representing the Squid Sister they have sided with: players on Callie's team see scowling eyes, and those on Marie's team see more laid-back eyes. Both versions have their signature pupils, but with a dark red color instead of the usual gold.


 * In Splatoon 2, since 4.0.0, Splatfest power is no longer displayed in Normal Mode, only in Pro Mode. However, the game still keeps track of it internally, even in Normal Mode, to determine how much a team gets for a winning bonus.

Players with the highest Splatfest Power are featured in the Splatfest Top 100, note that it takes the highest and not the most current Splatfest power.

League Power
Players get their initial league power based on their performance in the first 7 matches. Every change of rotation resets the league power.

Groups that their league power is high enough will receive commemorative medals, either Gold Medals,  Silver Medals , or  Bronze Medals and the top 100s are displayed in previous records.

X Power
At update 3.0.0 in Splatoon 2, Rank X was added, which is higher than S+. This rank replaced S+10 to S+50 when the update was released. The rank meter was replaced with an "X Power" level.


 * 10 calculation matches are used for the Glicko2 initial power calculation.
 * Your starting X Power (during your calculation period) is between 2000 and 2300. The initial RD is 250.
 * If you end up below 2000 power at the end of the season, you are demoted to S+9.
 * If you end up below 1900 power mid-season and you lose again, you are demoted to S+9.

Trivia

 * The promotional images for Splatfest Power show the Cats vs. Dogs and Rice vs. Bread Splatfest Tees and Ink colors despite it having not existed when they were used.