Like all battleships, the Iowa carried heavy armor protection against shellfire and bombs with significant underwater protection against torpedoes. The Iowa’s armor scheme was modeled on that of the preceding South Dakota class, and designed to give a zone of immunity against fire from 16-inch/45-caliber guns between 18,000 and 30,000 yards (16,000 and 27,000 m) away. The magazines and engine rooms were protected by an armored belt 12.2 inches (310 mm) thick, which sloped to give an effective vertical thickness of 13.5 inches (340 mm). Their armor was not sufficient to protect against guns equivalent to their own 16-inch/50-caliber guns; increasing the armor would have increased weight and reduced speed. Missouri and Wisconsin incorporated the most significant change in armor from the Sout
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| - Like all battleships, the Iowa carried heavy armor protection against shellfire and bombs with significant underwater protection against torpedoes. The Iowa’s armor scheme was modeled on that of the preceding South Dakota class, and designed to give a zone of immunity against fire from 16-inch/45-caliber guns between 18,000 and 30,000 yards (16,000 and 27,000 m) away. The magazines and engine rooms were protected by an armored belt 12.2 inches (310 mm) thick, which sloped to give an effective vertical thickness of 13.5 inches (340 mm). Their armor was not sufficient to protect against guns equivalent to their own 16-inch/50-caliber guns; increasing the armor would have increased weight and reduced speed. Missouri and Wisconsin incorporated the most significant change in armor from the Sout
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| - Like all battleships, the Iowa carried heavy armor protection against shellfire and bombs with significant underwater protection against torpedoes. The Iowa’s armor scheme was modeled on that of the preceding South Dakota class, and designed to give a zone of immunity against fire from 16-inch/45-caliber guns between 18,000 and 30,000 yards (16,000 and 27,000 m) away. The magazines and engine rooms were protected by an armored belt 12.2 inches (310 mm) thick, which sloped to give an effective vertical thickness of 13.5 inches (340 mm). Their armor was not sufficient to protect against guns equivalent to their own 16-inch/50-caliber guns; increasing the armor would have increased weight and reduced speed. Missouri and Wisconsin incorporated the most significant change in armor from the South Dakota class: the increase from 11.3 inches (290 mm) to 14.5 inches (370 mm) of the vertical armor on the forward armored bulkhead, the conning tower, and the turret barbettes. The extra armor provided protection from fire directly ahead, which was considered more likely given the high speed of the Iowa class. The installation of armor on the Iowa-class battleships also differed from those of earlier battleships in that the armor was installed while the ships were still "on the way" rather than after the ships had been launched.
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