Population, also known as 
jobs created by 
Demographics[編輯 | 編輯原始碼]
Each planet has four variables that determine its demographic direction. A planet can have only one growing pop, one declining pop and one assembling pop at any time.
Pop growth[編輯 | 編輯原始碼]
Pop growth represents the increase in population from natural reproduction and immigration. A new pop appears after [math]\displaystyle{ 100 + (\text{growth required scaling} \cdot {\text{total empire population}}) }[/math] growth points have been accumulated; the growth required scaling is a game setting. The base growth rate is determined by the number of pops on the planet along a logistic curve determined by the 
planet capacity, then pop growth modifiers are applied, and lastly pop growth from immigration/emigration is added/subtracted. The logistic growth ceiling game setting determines the maximum base growth.
Any species existing on the planet or which has immigration access to the planet may be selected to grow there. When choosing a species to grow, planets will generally prioritize species that are under-represented on the planet and have citizenship equal to that of the already existing species. If immigration access is lost to all planets containing the currently selected species, a new species will be selected and all existing growth progress will be erased. Species can be chosen manually for growth if the Population Controls policy is set to Allowed.
Pop growth stops when a planet is 15% overcrowded and has 5 pops without housing. Pops start to decline when a planet is 25% overcrowded.
Planet capacity is capped at 500, regardless of free housing or unblocked districts. However, pops over 500 will not stop growing or decline until required housing exceeds available housing by 15% or 25%, as normal.
| Condition | Formula |
|---|---|
| [math]\displaystyle{ \frac{{\text{planet capacity}}}{2} \gt {\text{planet population}} }[/math] | [math]\displaystyle{ \text{total base growth} = 3 \cdot \max (0.125 \cdot (\text{population} - \frac{\text{population}^2}{\text{planet capacity}} - 1) , 1) }[/math] |
| [math]\displaystyle{ \frac{{\text{planet capacity}}}{2} \le {\text{planet population}} }[/math] | [math]\displaystyle{ \text{total base growth} = 3 \cdot 0.125 \cdot (\text{population} - \frac{\text{population}^2}{\text{planet capacity}} - 1) }[/math] |
Total base pop growth is between 0.3 and [math]\displaystyle{ (\text{logistic growth ceiling} \cdot 3) }[/math] (default 4.5) growth per month. Pop growth modifiers, including habitability penalties, are then applied, and then population growth from immigration/emigration is added/subtracted.
Migration[編輯 | 編輯原始碼]
Migration is calculated by subtracting emigration push from immigration pull, both of which are determined by factors such as 
unemployment. A planet with more emigration than immigration will have its growth speed lowered and the amount lowered will be added to potential immigration targets. Planets with higher immigration pull will receive a greater share of this migration, which is converted directly into pop growth. Signing a 
15 years have passed or the colony has 10 pops.
Growth weight[編輯 | 編輯原始碼]
The exact mechanics by which a new pop is selected for growing/assembly is not fully known. However a bunch of values can be extracted from the Stellaris/common/defines/00_defines.txt file.
| Name | Value | Description |
|---|---|---|
| New_Pop_Species_Randomness | 0.5 | The higher this is, the more random species selection of new pops will be |
| New_Pop_Same_Species_Weight | 1.0 | The higher this is, the more new pops will be weighted by number of same or subspecies pops |
| New_Pop_Exact_Species_Weight | 0.5 | The higher this is, the more new pops will be weighted by number of exact same species pops |
| New_Pop_Slavery_Weight | 0.25 | The higher this is, the more new pops will tend to be balanced between enslaved and non-enslaved species |
| New_Pop_Species_Div | 0.05 | The higher this is, the more planets will tend to grow species that are underrepresented on the planet |
| New_Pop_Habitability_Threshold | 0.75 | If habitability is under this, apply exponentially increasing penalties to new pop weight |
| New_Pop_Homeworld_Mult | 2 | Pops have increased weight for growing on their homeworld |
| New_Pop_Growth_Mod_Mult | 0.33 | How much does species growth mod trait matter for new pop weight |
| NEW_POP_Immigration_Mod_Mult | 1 | How much does species immigration growth mod trait matter for new pop weight (when there is immigration) |
| Pop_Decline_Threshold | 3.0 | A species will decline when there is another species with a growth priority this many times higher |
Pop assembly[編輯 | 編輯原始碼]
Pop assembly represents a planet's capacity for constructing 
Robotic pop assembly is affected by traits and other modifiers.
Organic pop assembly is not affected by any traits or modifiers except for the following:
- +5% per
醫務工作者 Job - −25% from
石質 - −75% from
屍化體
| Assembly type | Monthly pop assembly points | Source | DLC | Other requirements |
|---|---|---|---|---|
| Robotic pop assembly
|
+2 |  |
 | |
| +1 |  |
 |
 | |
| Organic pop assembly
|
+2 |  |
 |
 |
| +2 |  |
  |
 | |
| +3 |  |
|
 | |
| +2 to +15 |  Ancient Clone Vat buildings |
 |
 | |
| +0.02 |  Each pop with the Budding trait |
 |
Pop decline[編輯 | 編輯原始碼]
Pop decline represents the decrease of certain species on the planet due to purging or severe overcrowding. A pop will disappear after 100 decline points have been accumulated. By default, decline rate is −5 decline points per month. Overcrowded planets that have over-represented species will have those species begin to decline in numbers and be replaced by newly growing, under-represented species that have equal citizenship. Purging a particular species will cause that species to decline more rapidly depending on the purge type; the decline factor from purging overrides natural decline factors.
Resettlement[編輯 | 編輯原始碼]
Resettlement is the process of pops moving from one planet to another, more desirable one.
Automatic resettlement[編輯 | 編輯原始碼]
Sapient, unemployed, free pops have a chance (each month) to automatically resettle to another planet with available jobs and housing and suitable habitability. If a 
A 
Forced resettlement[編輯 | 編輯原始碼]
If the empire's 
Resettlement policy allows it, forced resettlement will instantly move a pop from one planet to another. This costs a base amount of 
| Pop category | Allowed? |  Base cost
| |
|---|---|---|---|
|
|
| ||
 |
|
500 | 50 |
 |
|
250 | 25 |
 |
|
100 | 10 |
|
 Always |
100 | 10 |
 |
|
50 | 0 |
 |
Always |
100 | 25 |
|
Always |
100 | 0 |
 Robotic servitude
|
Always |
100 | 0 |
 Subversive |
 Never |
n/a | |
| Modifier source | Cost
| |
|---|---|---|
|
|
| |
 Evacuation Protocols edict
|
−50% | |
 Appropriation tradition
|
−33% | |
 Operational Proxies tradition
|
−33% | |
 |
+0% | −100% |
 |
+0% | −100% |
 |
+0% | −100% |
 |
−25% | |
 |
−25% | |
 |
+25% | |
Happiness[編輯 | 編輯原始碼]
Each pop in an empire has a 
- Each point of happiness above 50 adds +1%
主流思潮吸引力 to free pops and +2%
威權主義 ethics attraction to slaves. - Each point of happiness below 50 adds −1%
主流思潮吸引力 to free pops and +10%
平等主義 ethics attraction to slaves. - Each point of happiness above 50 gives each pop −0.02
犯罪與異常 , up to 0 per pop at 100% happiness. - Each point of Happiness below 50 gives each pop +0.02
犯罪與異常 , up to +2 per pop at 0% happiness.
Fortunately, there are many ways to improve happiness in an empire. Planetary 
ruler traits can positively affect happiness. Events may have an impact on planetary or empire happiness for a limited time as well.
Approval rating[編輯 | 編輯原始碼]
Pop approval rating is a measure of the population's support towards the empire. It is determined by the average
Approval rating ranges from 0% to 100% and has a base level of 50%.
- Each point of approval rating above 50% adds +0.6
穩定度 , up to +30 at 100% approval rating. - Each point of approval rating below 50% adds −1
穩定度 , up to −50 at 0% approval rating.
Upkeep[編輯 | 編輯原始碼]
Most organic pops consume 
1 
1 
Robots instead consume 1 
Pops with the 
Housing[編輯 | 編輯原始碼]
As a rule of thumb, each resource district exactly pays for itself in terms of housing, while the pops that work building jobs need city districts (or housing buildings) for their housing, though the capital building provides some buffer before cities are needed. This applies equally to 
Amenities[編輯 | 編輯原始碼]
The formula for extra amenities contributing
The formula for missing amenities contributing
Amenities can be affected on an empire-wide basis by the following:
| Source | Amenities |
|---|---|
 |
+5% |
| Executive Retreat branch office building
|
+10% |
 Resort World
|
+15% |
 Profane Consecrated World
|
+1% |
| Respected Consecrated World
|
+2% |
| Venerated Consecrated World
|
+3% |
| Holy World Consecrated World
|
+4% |
 Mega Art Installation (stage I)
|
+5% |
| Mega Art Installation (stage II)
|
+10% |
| Mega Art Installation (completed)
|
+15% |
| Mega Art Installation (perfection)
|
+20% |
 Vultaum Star Assembly secrets special project
|
+20% |
| Source | Amenities usage |
|---|---|
 |
−10% |
 Vultaum Reality Perforator relic
|
−10% |
 |
−5% |
 Discourage Planetary Growth decision
|
+25% |
Stratum[編輯 | 編輯原始碼]
Strata represent pops' social classes. The higher a pop's stratum, the more political power they have and the more
If a pop takes a job above its stratum it will be promoted to the higher stratum. If there are no available jobs of equal or higher stratum the pop will become unemployed, slowly demoting in stratum and causing
| Stratum | Rank | Resettlement cost | Requirements | Output modifiers |
|---|---|---|---|---|
| |
3 |
|
|
Modifiers
|
| |
2 |
|
|
Modifiers
|
| |
1 |
|
|
Modifiers
|
 |
0 |
|
|
Modifiers
|
 |
0 |
|
|
Modifiers
|
| |
0 |
|
Organic species in a  |
Modifiers
|
 |
0 | 100 |
Undesirables  |
|
 |
0 | 100 |
Assimilation |
|
| |
1 |
|
High |
|
| |
2 |
|
High |
|
| |
2 |
|
High |
|
| Pre-sapient
|
0 |
|
Pre-sapients | |
 Precursor
|
3 |
|
Fallen Empire | |
 Primitive
|
0 |
|
Alien pops on The Preserve |
Slavery[編輯 | 編輯原始碼]
Entire species can be enslaved by giving them a certain citizenship, which opens a new tab in the Species Rights menu called Slavery Type that determines what are the effects of slavery.
| |
Slavery requirements | Notes |
|---|---|---|
| Slaves | Species is alien and the empire is  Authoritarian,   Xenophobe or |
|
| Servitude | Species is robot and the empire has the Servitude Artificial Intelligence policy | If |
| Any |   |
Up to 35% of the pops are enslaved if the world does not have enough pops with the Slaves or Servitude citizenship |
Enslaved pops also use only 0.75 0.75 
−50% 25%
Low
Slave output can be affected by the following:
| Source | Slave output | Note |
|---|---|---|
| |
+10% | |
| |
+10% | |
 |
+10% | |
| Extended Shifts edict
|
+10% | Actual bonus is +20%, see below |
 Slave Optimization agenda
|
+10% | |
 Workplace Motivators tradition
|
+5% | Actual bonus is +10%, see below |
| |
+5% | |
  Hunger Strike planet modifier
|
−50% | |
 Slave Riots planet modifier
|
−1000% |
Slaves, workers and specialists[編輯 | 編輯原始碼]
In addition to the slave resource output modifiers, worker resource output modifiers can also affect slaves in worker jobs. As of 3.0.1, slaves in specialist jobs are affected by specialist output modifiers but not by slave resource output modifiers, if in Indentured Servitude.
- Slaves working on
礦工 jobs can benefit from 勞工 resource output modifiers, such as 威權主義 and
強壯 .
If a modifier affects the resource output of both workers and slaves, it actually affects slaves in worker jobs twice.
- The Extended Shifts edict increases slaves resource output by +10% and workers resource output by +10%, resulting in an actual +20% bonus to slaves in worker jobs.
Modifiers that affect workers aside from the resource output ones don't affect slaves.
- The Extended Shifts edict decreases slaves' happiness by −10% and worker happiness by −10%. It does not cause the slaves to suffer −20% happiness.
Ethics attraction modifiers[編輯 | 編輯原始碼]
Each pop in an empire will only embrace a single, non-fanatic ethic. At the start of the game, the population will be made of the empire's governing ethics. As population expands and eventually is divided over various planets and sectors, certain segments may decide to adopt values that are different from the core values of the species due to various circumstances in and around the empire.
Each ethic has a certain attraction value attached for all pops, depending on both the empire's situation and their own. Each pop can only switch ethics once per year. The exact values and options that influence the attraction levels of certain ethics can be found at Ethics attraction. The attraction factors of ethics can be amplified by certain circumstances such as policies or traits.
Having a positive ethics attraction effect will let all actions that increase attraction to the government ethics result in even more attraction, and negative amounts will be decreased. With a modifier of 50%, an action that would increase attraction by 2 would instead increase by 3.
Hovering over a pop's ethic will display the attraction towards all ethics.
Robots[編輯 | 編輯原始碼]
Robots are artificial pops and can be constructed once the required technology becomes available. They have the +200% habitability on any planet. Robots can be given new traits via robo-modding, and the species template with the highest number of used trait points will be built by default. A different template can be specified for each planet.
The jobs a robot can have are limited by the highest robot technology researched. If an empire researches the 
| Tech level | Maximum stratum | Can colonize | Sapient |
|---|---|---|---|
| |
|
|
|
 Droids
|
   |
|
|
 Synthetics
|
|
|
|
Robots without Citizen Rights require 50% less Synthetics technology, they lose their sapience, and if a planet with non-sapient robots is captured by an empire that has the Synthetics technology and does not have the Outlawed Artificial Intelligence policy, they are immediately given sapience. Note that non-sapient robots can do all specialist jobs with Droids tech, but not after researching Synthetics tech.
|
|
只可用於 Utopia DLC 已啟用。 |
- It's possible to take the
Synthetic Evolution ascension perk and turn all organic pops and leaders into synthetics. -
蜂巢思維 empires cannot build robots and will always purge all robots on their worlds.
|
|
只可用於 Synthetic Dawn DLC 已啟用。 |
- As long as an empire has the Artificial Intelligence policy set to Servitude there is a risk of them starting an AI rebellion, if either the Synthetics or Sapient Combat Simulations techs have been researched.
-
機械智能 empires cannot build robots, but they can use them as drones if conquered from a regular empire or bought on the slave market. Robots in a Machine Intelligence empire can work all jobs and are not affected by happiness.
Purges[編輯 | 編輯原始碼]
、
Targeted pop purging still requires applying the species-wide slavery at minimum and it is limited to a basic extermination, although without production penalty. Bio-Trophies.
Species-wide purging is done by setting the species'
- Pre-sapients can only be purged if the Pre-Sapients policy is not set to Protected and they are automatically purged if it's set to Extermination.
- Robots are automatically purged if the Robotic Workers policy is set to Outlawed.
- Synthetics can only be purged if the Artificial Intelligence policy is not set to Citizen Rights.
- Empires with the
掌控進化 ascension perk can change the citizenship of hive mind pops to 同化 , which prevents them from being purged.
Fallen and Awakened Empires can choose not to purge Hive-Minded/Machine pops.
Having any species-wide purge is a negative issue for Xenophile factions, aside from the case of
There are multiple types of purge available, determined by the 
Refugees[編輯 | 編輯原始碼]
Pops from other empires may flee to escape purges, slavery, resettlement, crisis bombardment or as a result of land appropriation. Whether another empire is willing to accept those fleeing depends on its Refugees policy. Refugees will not head for empires where they have the Undesirables citizenship. Accepted refugee pops will get +20
Once refugees are generated they will head for any empire that will accept them with their Refugees policy following the following order:
-
宜居性 at least 70% and 住房 at least 1 -
宜居性 at least 70% -
宜居性 at least 50% and 住房 at least 1 -
宜居性 at least 50% -
宜居性 at least 20% and 住房 at least 1 -
宜居性 at least 20% -
住房 at least 1 - Any other planet
Pops that are robotic or have the 
參考資料[編輯 | 編輯原始碼]
| 治理 | 帝國 • 思潮 • 政府 • 國民理念 • 政策 • 法令 • 領袖 • 派系 • 人口 • 物種權利 • 經濟 • 科技 • 傳統 • 犯罪率 |
| 探索 | 探索 • 地圖 • 物種 • 異常現象 • 事件 • FTL • 失落帝國 • 前超光速物種 • 先驅者 • 太空生命體 |
| 殖民 | 殖民 • 天體 • 行星特徵 • 行星管理 • 區劃 • 建築 • 艦船 • 恆星基地 • 巨型結構 |
| 外交 | 外交 • 貿易 • 附屬國 • 聯邦 • 星海共同體 • AI 性格 • 情報 |
| 戰爭 | 戰爭 • 太空戰 • 地面戰 • 艦船設計器 |
| 其它 | 特質 • 環境改造 • 種群修飾 • 奴役 • 危機 • 預設帝國 • AI 玩家 • 彩蛋 |