Hearts of Iron IV
HOI4 Tools
Compare division, plane, and ship design stats quickly with calculators built from official game-file data.
Free to use. Saved designs stay in your browser.
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Division Designer
Calculate combat battalions, support companies, equipment requirements, and combat stats for HOI4 division templates.
Doctrine and terrain modifiersEquipment requirementsSpecial forces limit calculator
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Plane Designer
Calculate plane stats from airframe, role, engine, weapon, bomb bay, and special module choices.
Airframe presetsDoctrine effects
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Ship Designer
Inspect hulls, module slots, production cost, strategic resources, and research locks for ship designs.
Hull presetsDoctrine effects