List of technologies in Civ4

Civilization IV comes with 86 technologies. The Beyond the Sword expansion pack adds six new technologies and changes four of the old ones. The Warlords expansion pack neither adds nor changes any technologies.

Civilization IV Technology Tree

Technologies

Technology	Cost	Enables	Obsoletes
Ancient
The Wheel	60	Units: Chariot Improvements: Road
Agriculture	60	Improvements: Farm
Animal Husbandry	100	Improvements: Pasture Other effects: Reveals Horse
Fishing	40	Units: Work Boat
Hunting	40	Units: Scout Spearman Improvements: Camp
Mysticism	50	Buildings: Monument Wonders: Stonehenge
Archery	60	Units: Archer Crossbowman (with Machinery) Horse Archer (with Horseback Riding) Longbowman (with Feudalism)
Pottery	80	Buildings: Granary Improvements: Cottage
Writing	120	Buildings: Library Other: Open Borders
Sailing	100	Units: Galley Buildings: Lighthouse Other: Coastal trading
Masonry	80	Buildings: Walls Aqueduct Wonders: Pyramids Great Lighthouse Great Wall Improvements: Quarry
Mining	50	Improvements: Mine
Priesthood	60	Buildings: Temple Wonders: Oracle
Bronze Working	120	Units: Axeman Civics: Slavery Other: Chopping down forests
Polytheism	100	Wonders: Parthenon Temple of Artemis Other: First to discover founds Hinduism
Monotheism	120	Civics: Organized Religion Other: First to discover founds Judaism
Meditation	80	Buildings: Monastery Other: First to discover founds Buddhism
Classical
Monarchy	300	Improvements: Winery Civics: Hereditary Rule
Alphabet (changed in BtS)	300	Other: Technology trading
Mathematics	250	Buildings: Aqueduct Wonders: Hanging Gardens Improvements: Fort Other effects: 50% more hammers by chopping down forest
Construction	350	Units: War Elephant Catapult Buildings: Colosseum Other: Bridge building
Code of Laws	350	Buildings: Courthouse Wonders: Chichen Itza Civics: Caste System Other: First to discover founds Confucianism
Metal Casting	450	Units: Trireme Buildings: Forge Wonders: Colossus Improvements: Workshop
Compass	400	Units: Explorer Buildings: Harbor
Currency	400	Buildings: Market Grocer Other effects: +1 trade routes Gold trading
Horseback Riding	250	Units: Horse Archer (with Archery) Knight (with Guilds) Cavalry (with Military Tradition and Rifling) Cuirassier (with Gunpowder and Military Tradition)
Drama	300	Buildings: Theater Wonders: Globe Theatre Other: Culture slider
Calendar	350	Improvements: Plantation Other: Centers the world map	Stonehenge Obelisk
Iron Working	200	Units: Swordsman Other effects: Reveals Iron Can clear jungles
Literature	200	Wonders: Heroic Epic National Epic Great Library
Aesthetics (BtS)	300	Wonders: Parthenon Statue of Zeus Shwedagon Paya
Medieval
Banking	700	Buildings: Bank Civics: Mercantilism
Engineering	1000	Units: Pikeman Trebuchet (Warlords) Buildings: Castle Wonders: Hagia Sophia Other: +1 road movement
Guilds	1000	Units: Knight (with Horseback Riding)
Feudalism	700	Units: Longbowman (with Archery) Civics: Vassalage Serfdom
Machinery	700	Units: Crossbowman (with Archery) Maceman (with Civil Service) Improvements: Windmill Watermill
Civil Service	800	Units: Maceman (with Machinery) Civics: Bureaucracy Other effects: Farms spread irrigation
Philosophy	800	Wonders: Angkor Wat Civics: Pacifism Other: First to discover founds Taoism
Optics	600	Units: Caravel Improvements: Whaling Boats Other effects: Can see +1 tiles across water
Theology	500	Wonders: Hagia Sophia, Apostolic Palace Civics: Theocracy Other: First to discover founds Christianity
Paper	600	Other: Map trading
Music	600	Buildings: Cathedral Wonders: Sistine Chapel Other: Building culture First to discover receives Great Artist
Divine Right	1200	Wonders: Versailles Spiral Minaret Other: First to discover founds Islam
Renaissance
Economics	1400	Buildings: Customs House Civics: Free Market Other: First to discover receives Great Merchant	Castle
Constitution	2000	Buildings: Jail Civics: Representation
Astronomy	2000	Units: Galleon Frigate Buildings: Observatory Other: Trade through ocean tiles	Colossus
Democracy	2800	Buildings: Security Bureau Wonders: Statue of Liberty Civics: Universal Suffrage Emancipation
Education	1800	Buildings: University Wonders: Oxford University
Chemistry	1800	Units: Privateer Frigate Other effects: +1 from Workshops
Corporation (technology)	1600	Wonders: Wall Street Other: +1 trade route Corporations	Great Lighthouse
Replaceable Parts	1800	Improvements: Lumbermill Other: +1 from windmills and watermills
Gunpowder	1200	Units: Musketman
Rifling	2400	Units: Rifleman Infantry (with Assembly Line) Marine (with Industrialism) Mechanized Infantry (with Robotics) Tank (with Industrialism) Cavalry (with Horseback Riding and Gunpowder)	Chichen Itza Walls
Printing Press	1600	Other effects: +1 from Villages and Towns
Nationalism	1800	Wonders: Hermitage Taj Mahal Civics: Nationhood
Military Science (BtS)	2000	Units: Grenadier Ship of the Line (with Astronomy) Buildings: Military Academy
Military Tradition	2000	Units: Cuirassier (with Gunpowder and Horseback Riding) Cavalry (with Rifling and Horseback Riding) Wonders: West Point Other: Defensive pacts
Liberalism	1400	Civics: Free Speech Free Religion Other: First to discover gets 1 free tech
Industrial
Railroad	4500	Units: Machine Gun Improvements: Railroads
Electricity	4500	Buildings: Bunker Bomb Shelter Wonders: Broadway Other effects: +1 from windmills +2 from watermills
Assembly Line	5000	Units: Infantry (with Rifling) Buildings: Factory Coal Plant Wonders: Pentagon
Steel	2800	Units: Cannon Ironclad (with Steam Power) Buildings: Drydock Wonders: Ironworks
Medicine	4500	Buildings: Hospital Wonders: Red Cross Civics: Environmentalism
Industrialism	6500	Units: Marine (with Rifling) Tank (with Rifling) Battleship Carrier Buildings: Industrial Park Other effects: Reveals Aluminum	Ivory
Communism	2800	Units: Spy Wonders: Scotland Yard Kremlin Civics: State Property Other: Permanent alliances
Scientific Method	2400	Improvements: Forest Preserve Other: Reveals Oil	Great Library Monastery
Steam Power	3200	Units: Ironclad (with Steel) Improvements: Levee Other: Reveals Coal +50% faster improvement building	Hagia Sophia
Fission	5500	Units: ICBM Tactical Nuke Buildings: Nuclear Plant Projects: The Manhattan Project
Combustion	3600	Units: Transport Destroyer Submarine (with Radio) Improvements: Well	Whale
Biology	3600	Other: Building farms without irrigation +1 from farms
Physics	4000	Units: Airship (BtS) Other: Reveals Uranium First to discover receives Great Scientist
Fascism	2400	Units: Paratrooper Mt. Rushmore Civics: Police State Other: Permanent alliances First to discover receives Great General
Artillery	4000	Units: Artillery Anti-Tank Mobile Artillery (with Laser)
Modern
Radio	6000	Units: Submarine (with Combustion) Bomber (with Flight) Wonders: Eiffel Tower Rock 'n' Roll
Flight	5000	Units: Fighter Bomber (with Radio) Gunship (with Rocketry and Advanced Flight) Jet Fighter (with Composites) Stealth Bomber (with Stealth) Buildings: Airport
Mass Media	3600	Buildings: Broadcast Tower Wonders: Hollywood United Nations
Plastics	7000	Buildings: Hydro Plant Wonders: Three Gorges Dam Improvements: Offshore Platform	Fur
Computers (changed in BtS)	6500	Units: Modern Armor (with Composites) Buildings: Laboratory (with Superconductors) Projects: The Internet	Angkor Wat Spiral Minaret University of Sankore
Ecology	5500	Buildings: Recycling Center Spaceship parts: SS Life Support Civics: Environmentalism Other: Cleaning Fallout
Refrigeration	4000	Buildings: Supermarket Other: +1 movement for naval units
Rocketry	5000	Units: SAM Infantry Gunship (with Flight and Advanced Flight) Guided Missile (with Radio) Tactical Nuke (with Fission) ICBM (with Fission) Attack Submarine (with Radio and Combustion) Projects: Apollo Program Spaceship parts: SS Casing
Robotics (changed in BtS)	8000	Units: Mechanized Infantry Stealth Bomber (with Stealth) Stealth Destroyer (with Stealth) Buildings: Space Elevator (with Satellites) Spaceship parts: SS Docking Bay
Satellites	6000	Spaceship parts: SS Docking Bay Buildings: Space Elevator (with Robotics) Other effects: Reveals entire world map
Laser (BtS)	7000	Units: Mobile Artillery (with Artillery) Mobile SAM Buildings: SDI
Fiber Optics (changed in BtS)	7500	Projects: The Internet Spaceship parts: SS Cockpit	Kremlin
Advanced Flight (BtS)	5000	Units: Gunship (with Rocketry and Flight)	Stable
Superconductors (BtS)	6500	Buildings: Laboratory (with Computers) Spaceship parts: SS Thrusters
Composites	7500	Units: Modern Armor (with Computers) Jet Fighter (with Flight) Spaceship parts: SS Casing
Future
Fusion	8000	Spaceship parts: SS Engine Other effects: First to discover receives Great Engineer
Genetics	7000	Spaceship parts: SS Stasis Chamber Other effects: +1 in all cities
Stealth (BtS)	8000	Units: Stealth Bomber (with Robotics) Stealth Destroyer (with Robotics)
Future Tech	8000	Other: +1 in all cities +1 in all cities