From Hearts of Iron 4 Wiki
Revision as of 12:33, 13 July 2016 by Bridger15 (talk | contribs) (Factories)
Jump to navigation Jump to search
See also: Construction

Production is how a country manufactures Equipment.png equipment, consumer goods, infrastructure, and buildings.


There are three types of factories:

  • Civilian factory Civilian factories: Construction (including repair), trade, and consumer goods.
  • Military factory Military factories: Infantry/artillery, armor, and aircraft.
  • Naval dockyard Naval Dockyards: Ships, Submarines and Convoys.

Civilian and military factories have a base output of 5. This value is then multiplied by the Production efficiency.png Production Efficiency. Naval dockyards have a base output of 2.5, but always have a production efficiency of 100%.

Consumer goods

Depending on economic laws, a number of civilian factories will be occupied by producing consumer goods and are unavailable for construction or trade. This number is computed as a percentage of the total number of factories, rounding upwards.

Production lines

Production is organized into production lines, each of which produces a single type of equipment at a time. Up to 15 factories may be assigned to a single production line, but you may have several lines producing the same item.

Production line legend sketch.png

Production efficiency.png Production Efficiency

Each Production Line has its individual "skill level" which determines how adept it is at producing its current item. Production efficiency is always at least 10% and increases by a base of 0.25% per day up to the cap, which can be increased by research and national focii. The higher the efficiency, the faster the Production Line produces Equipment.png Equipment, up to a maximum value. Running the same Production Line continuously increases its Production Efficiency.

Adding one or more new factories to an existing production line reduces production efficiency, and changing a production line to a related type of equipment cancels production of the current unit, and also reduces its efficiency depending on how drastic the change:

  • -10%: Different variant of the same model (e.g. Panzer III Ausf. F -> Panzer III Ausf. G)
  • -50%: Different model of the same chassis or airframe (e.g. Panzer III -> StuG III)
  • -70%: Different unit of the same family (e.g. Panzer III -> Panzer IV)
  • -80%: Different unit of the same archetype (e.g. Panzer IV -> Tiger)

Note that shipbuilding always has a production efficiency of 100%.


Resources cannot be stockpiled — they flow directly to production with any excess resources being effectively wasted.

Each equipment requires resources to produce. Lacking sufficient resources will apply a factory output and production efficiency increase penalty of up to -90%, with each resource (as opposed to each unit of resource) being weighted evenly. For example, producing something that costs 2 Steel and 1 Oil while lacking Oil will result in a -45% penalty (rather than a -30% penalty). This penalty stacks multiplicatively with other modifiers.

There are six strategic resources.

Icon Resource Equipment
Oil.png Oil Planes, except Jet Engined
Tanks and Trucks
Rubber.png Rubber Planes
Aluminum.png Aluminum Planes
Support Equipment
Steel.png Steel Infantry Weapons and Support Equipment
Artillery, Anti-Air and Anti-Tank
Tungsten.png Tungsten Artillery and Anti-Tank
Medium Tanks
Jet planes
Chromium.png Chromium Heavy tanks
Large ships (CV, BB and BC)


Land divisions and air wings are not produced as atomic units. Instead, factories produce individual tanks, airplanes, and so forth. This equipment is then sent to fill out the country's land divisions and air wings. Unlike resources, equipment can be stockpiled.

Equipment Supplies
Anti-Air Anti-airAnti-air
Anti-Tank Anti-tankAnti-tank
Artillery ArtilleryArtillery
Infantry Equipment EngineersEngineers

Military policeMilitary police

Light Tank Light tankLight tank
Mechanized MechanizedMechanized
Medium Tank Medium tankMedium tank
Support Equipment EngineersEngineers

Field hospitalField hospital
Logistics companyLogistics company
Maintenance companyMaintenance company
Military policeMilitary police
Signal companySignal company

Trucks Field hospitalField hospital

Logistics companyLogistics company
Signal companySignal company

External Links

Spreadsheet: [Hearts of Iron IV Resource Distribution by Country]