Industry & production

Factory efficiency, the switching-penalty curve, buildings, and the trade and market systems that feed raw production capacity.

Guides

Production guide

How HOI4 factory output and production efficiency actually work — the output formula, the square-root efficiency curve, switching penalties, and idle decay, all pulled live from the game's own defines.

Key numbers

Industry & production key numbers
WhatValue
Starting production efficiency (%)10
Base max production efficiency (%)50
Daily efficiency loss on an idle line1
Base military factory speed3.5
Max building levels15

Defines

Technology