经验

在一个国家，指挥官和陆/海/空军单位级别上，通常会拥有缩写为XP的经验（Experience）。它用于修改陆军师编制，舰艇的衍生型和飞行器的衍生型，主要是通过战斗获得的。

国家经验

在战斗和训练中可以获得国家经验，包括派遣志愿军和远征军，租借装备等。军事顾问每天都会给予静态加成，以使他们获得指定的经验。一些国策和内阁大臣也可以提供国家经验。国家经验共有三种类型：陆军经验，海军经验和空军经验，每种经验都可用于修改装备进行改进，修改编制或在相关学说中获得 +100％ 研究速度的加成。国家一级的经验存储上限为 500 。

陆军经验

陆军经验可用来修改师编制或创建陆军装备 装备的衍生型。它也可以给学说研究带来极大的好处。

Navy experience

Navy experience is used to create ship variants and give doctrine research bonuses.

Air experience

Air experience is used to create aircraft variants and give doctrine research bonuses.

Commander experience

主条目：Commander#Experience

Commanders gain experience as the forces under their command engage in combat. There are no air commanders, however, air combat may generate Aces. Aces boosts the air group they are assigned to, and give the best bonus to small air groups. The listed bonuses for aces are the bonuses given for an air wing of 100 planes. Commanders have skill levels to indicate their gained experience. These skill levels affect four skills - Attack, Defence, Planning and Logistics. Each Skill Level of Army Commanders gives a flat bonus - +5% to Attack or Defence, +5% planning speed and +2% max planning, or -2% supply consumption respectively. Each Skill Level of admirals increases Fleet Coordination and Naval Hit Chance. The current advance to the next skill level can be seen by hovering over the skill level number. Commanders do not only gain experience but also traits during combat, which give more situational but still helpful boni.

Unit experience

Individual land, air wings and naval units also gain experience. This gives a modifier to combat:

Experience level	Minimum experience	Land Modifier	Naval Modifier	Air Modifier
Green/Fresh/Rookies	0%	−25%	Damage:-10% Defense:-10%	Air Attack:-15% Agility:-15% Night Operations Penalty:+15%
Trained	10%	0%	0%	Air Attack: 0% Agility: 0% Night Operations Penalty: 0%
Regular	30%	+25%	Damage:+9.90% Defense:+6.60%	Air Attack:+4% Agility:+6% Night Operations Penalty:-4%
Seasoned	75% 70% for air wings	+50%	Damage:+19.90% Defense:+13.30%	Air Attack:+14% Agility:+21% Night Operations Penalty:-14%
Veterans	90%	+75%	Damage:+30% Defense:+20%	Air Attack:+20% Agility:+30% Night Operations Penalty:-20%

Air units scale the experience effects between levels according to experience progress, so that 99% progress on the 'trained' level gives the same bonuses as 0% progress on the 'seasoned' level. Note that scout planes receive significantly lower bonuses and penalties.

Newly deployed land units normally begin with 'trained' experience, but can be deployed early with 'green' experience. Naval and air units always start on the 'fresh' and 'rookies' levels, respectively.Exercising units in the field allows them to advance up to regular experience level, at the cost of time and equipment (and fuel in case of fuel-consuming units). Higher levels can only be gained through combat.

Replacing casualties reduces the experience of a unit. This loss can be reduced with Field Hospitals. Air units lose -30% less experience over friendly territory. For navies, some terrain types increase the amount of casualties and XP loss.

Changes to the template or increase of wing size reduces the experience of a unit.

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