Experience and Rank

Experience from Sorties
Ship experience from sorties is given by

$$\text{Experience } = \text{ Base } \times \text{ MVP } \times \text{ Flagship } \times \text{ Rank}$$
 * experience is dependent on a map
 * multiplier is 2 for MVP, 1 otherwise (always 1 for E rank, as there is no MVP)
 * multiplier is 1.5 for flagship, 1 otherwise
 * multiplier is dependent on a battle rank:
 * Multiplier for flagship MVP is therefore 3, maximum multiplier for base experience (flagship MVP and S rank) is 3.6.

Map experience

 * is base experience for a map
 * is experience for flagship (not MVP, A rank)
 * is for MVP (not flagship, A rank)
 * is for flagship MVP on A rank,  is for flagship MVP on S rank

XP Table (Ship)
'''Marrying level 99 ships raises them to level 100. No experience is necessary for this level up.'''

Technicalities
As can be seen, for levels 1-89, experience values grow quadratically: they can be split into a family of ranges, depending on levels, with each range having different quadratic function (any coefficients beside c₀ (last non-zero derivative) are not so important and more or less arbitrary, a simpler formula may exist):

That is, leveling is slowing down within the ranges (the difference between experience values grows linearly), and also slowing down even more between them, as c₀ grows linearly.

For levels 90-98 experience values appear to be proportional to the cube (resulting in even slower leveling):

Then, a different family of quadratic functions is used for levels 101-155:

Experience from Expeditions
For ship experience from expeditions see introduction to expeditions.

Experience from Exercises (PvP)
TODO

Training Cruiser Bonus
Training Cruisers (CT: Katori and Kashima) provide a post-cap bonus to the final experience gain.
 * The bonus is dependent on CT positions in the fleet and their levels.
 * When 2 CT are deployed, one as the flagship, only flagship level is used.
 * If both deployed as escort, only maximum level is used.

Admiral Ranks
Notes:
 * Your monthly server rank determines your title and insignia.
 * High scores update twice per day (along with PvP reset at 03:00 and 15:00 JST) and resets every month.
 * You can get admiral experience (HQ XP) from sorties, drills and expeditions.
 * Admiral experience is shown in the profile page below the Admiral Level. Admiral levels increase with experience gained.
 * Admiral levels increases the maximum resource soft cap and are speculated to improve Development results.
 * Refer to the Ranking section below for more detailed explanation of the mechanics.

HQ Experience from Sorties
For example, we can calculate experience gained from a 2-3 run as follows: A rank at a non-boss node followed by B rank at boss node,,   (from the table),  ,  ,.
 * and  are dependent on a map, see the table below
 * The majority of HQ XP comes from achieving victory at boss nodes

HQ Experience from Exercises (PvP)
"Lv Diff" is a difference between opponent's and player's HQ levels.

HQ Experience from Expeditions
Admiral experience gained from expeditions is not equal to the experience reward for your ships. Refer to the expedition page for information on experience values.

Difficulty Tiers
In some older Event maps and Extra Operation (EO) maps, enemy appearance and rare drop rates vary depending on your HQ level. Newer events (starting from winter 2015) now allow you to choose your difficulty manually, rather than using HQ level as a proxy, as it once was. However, the difficulties you can choose are determined by your HQ level; some event maps HP (as well as number of boss kills required) can be also be influenced by HQ level. Here are the overall details of the existing difficulty tiers:

Notes:
 * In case the 4th tier is not implemented, then the level ranges and drop rates in parentheses are used instead.
 * If the 4th tier is implemented, there is a high possibility that rare ships from previous events may drop on certain nodes.

Monthly Ranking
$$\text{Ranking points} = \text{Initial points} + \text{Monthly experience points} + \text{EO points}$$
 * You are ranked each month within your server based on your overall HQ ranking points gained during the month. These rankings are shown in the second left-hand tab in the profile page.
 * Your title, insignia, ranking points, and rank update twice per day along with the PvP reset at 03:00 and 15:00 JST.
 * Accounting for ranking points is performed at 02:00 and 14:00 JST; for example, any points gained after 14:00 JST will not show after 15:00 JST update, but only after 03:00 JST on the next update.
 * Ranking points gained for current month are given by
 * E.g. 5,000,000 HQ Exp during the year gives 100 initial points, all EO from the previous month give 22 initial points.
 * E.g. 100,000 HQ Exp gives 70 points.
 * is a sum of points for each EO map (1-5, 1-6, 2-5, 3-5, 4-5 and 5-5, see the table below) completed.
 * 780 points for all EO.
 * Experience and EO points are finalized at 22:00 JST on the last day of the month, experience points gained from 22:00 JST will be added to the next month's ranking points.
 * Displayed ranking points at 03:00 JST update on the first day of the month:.
 * EO points gained from 22:00 to 00:00 JST (i.e. before EO reset) on the last day of the month will be lost.
 * EO points gained after 00:00 JST (i.e. after EO reset) on the first day of the new month will be added to this new month's ranking points.
 * Achieving top ranks for each month yields rewards that are distributed in the following month (typically around the middle although it varies). Tiers are top 5, 20, 100, 500. Higher tiers generally have better rewards.
 * See the table below for rewards for previous months.
 * Different servers have different degrees of dedication from players. It may be worth finding out how many ranking points were required for your desired rank placement in your server from the previous month as a guide before attempting, as failing to reach the #500 cutoff means no rewards at all, even if you used a substantial amount of resources in the attempt; the amount required for some newer servers can be as little as half of that of the more hardcore servers.
 * You can check the data below for the previous months points and https://www.senka.me/ for the current month.
 * On the DMM site you can see (incomplete) top 500 list (also include approximate ranking points for some ranks) for each server by pressing [[File:nav_item04.png]] button.
 * As players also tend to complete some of their EOs at the last possible juncture (after 15:00 JST on the last day of the month) to lull competitors into complacency, players attempting a rank should be sure to gain an excess amount of required ranking points displayed to avoid being displaced at the last minute. This practice is colloquially referred to as firing the EO cannons.
 * Some players might get banned from obtaining ranking reward if they play in a way that does not comply with term of service. They would be remove from game ranking and unable to obtain ranking reward for an unknown number of months despite still able to play the game.
 * As players also tend to complete some of their EOs at the last possible juncture (after 15:00 JST on the last day of the month) to lull competitors into complacency, players attempting a rank should be sure to gain an excess amount of required ranking points displayed to avoid being displaced at the last minute. This practice is colloquially referred to as firing the EO cannons.
 * Some players might get banned from obtaining ranking reward if they play in a way that does not comply with term of service. They would be remove from game ranking and unable to obtain ranking reward for an unknown number of months despite still able to play the game.

Extra Operations

 * EO maps can be completed once a month. All progress is reset each month.
 * If you're using API, in order to reset EO maps at the beginning of every month, you will need to acquire a new API link after midnight JST on the first day of the each month. Otherwise, reloading the game may be required.
 * Clearing these maps will give additional HQ Ranking points, as well as medals that are required to make Remodel Blueprints. 4 medals are needed per blueprint.

Past Monthly Ranking Points
Archived data: 2015, 2016.

In general, servers can be divided into three categories:


 * "Old" servers (first seven servers).
 * Hashirajima (currently the last server, moving toward "new" servers).
 * And "new" servers (the rest).

Top 500 requirements for old and new servers form two distinct sets, each with a diameter of 100-300 points (depending on the month), see the attached chart (top 100 picture is similar).