Production is refers to the manufacturing of equipment such as tanks, guns, planes and ships used by the military to conduct a country's war. The construction of buildings in states and provinces, including both military installations and economic development, is known as construction.
There are three types of factories:
- Civilian factories: Construction (including repair), trade, and consumer goods.
- Military factories: Infantry equipment, transport, artillery, armor, and aircraft. These have a base output of 5. This value is then multiplied by Production Efficiency.
Thus, the production formula is :
For example, at 50% Production Efficiency with a 10% Modifier on Factory Outpout, the production would be
- Naval Dockyards: Ships, Submarines and Convoys. Have a base output of 2.5, but always have a production efficiency of 100%.
The main output modifiers for military factories and naval dockyards are Concentrated or Dispersed industry technology, while civilian factories are mainly affected by Construction industry technology and the economy law.
- See also: Construction
for Production by Civilian Factories
Production of Military and Naval Factories 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 a country can operate lines producing the same item.
Each Production Line has its own efficiency level which determines how good it is at producing its current equipment. The higher the efficiency, the faster the Production Line produces equipment, up to a maximum value. Running the same Production Line continuously increases its efficiency.
Production efficiency is always at least 10% and increases by a base efficiency gain of +0.25% per day up to a production efficiency cap, which starts at a base level of 50% in 1936. Both the daily gain and the cap can be increased by industry technology research and national focuses.
Production efficiency is tracked separately for each factory. Adding one or more new factories to an existing production line reduces production efficiency of the added factories. It is important to know that the factories already in the line do not lose efficiency - what they are making has not changed. Only the new factory has minimum efficiency. Also, switching a production line to a related type of equipment cancels production of the current unit and the time spent on it, and 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 [variants of the German medium tank 1])
- -50%: The direct upgrade of the equipment of the same type (e.g. Panzer III -> Panzer IV [German medium tank 1 to medium tank 2])
- -70%: Different model of the same chassis or airframe (e.g. Panzer III -> StuG III [German medium tank 1 to medium tank destroyer 1])
- -80%: Different unit of the same archetype (e.g. Panzer IV -> Tiger[German medium tank 2 to heavy tank 2])
Efficiency drops to the minimum of 10% for any other changes (e.g. Infantry Equipment 1 to Towed Artillery 1).
These effects can be reduced by researching Dispersed Industry I to IV.
Ships, submarines and convoys are produced in dockyards, which do not have production efficiency. Instead, every dockyard produces a flat 2.5 per day. Although all time and resources spent on an incomplete ship is lost if the line changes to another ship, the dockyard is at 100% efficiency as it starts the new ship design.
Each nation can use a percentage of the resources on its territory for military production. The total percentage is increased by researching Resource gain efficiency (under the tab 'industry'). Resources cannot be stockpiled — they flow directly to production with any excess resources being effectively wasted.
Different kinds of equipment require different 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.
|Oil|| Planes, except Jet Engined|
Tanks and Trucks
|Steel|| Infantry Weapons and Support Equipment|
Artillery, Anti-Air and Anti-Tank
|Tungsten|| Artillery and Anti-Tank|
|Chromium|| Heavy, Super-Heavy and Modern Tanks|
Large ships (Carrier, Battleship and Battlecruiser)
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. These stockpile can be viewed under the Logistics Tab.
|Light Tank||Light tank|
|Medium Tank||Medium tank|
Spreadsheet: [Hearts of Iron IV Resource Distribution by Country]