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Already super strong at his normal size — 7 ft 6 in, or 2.3 m — (though recently he has been depicted as being of a more normal height when not using his powers), Atom Smasher's strength and density increase proportionately to whatever size he chooses (it was enumerated in JSA #75 that his muscles and bones actually break and reform as they grow in order to achieve these great heights).
The upper limits of Rothstein's growth spurts are unclear, but heights above 50 feet are believed to tax his molecular structure and could cause permanent cell damage; however, in the DC Encyclopedia, it stated that he could grow up to 60 feet without problems. Whether there is a limit to the heights he can grow to is unknown. His major power showings include knocking out Power Girl with one stomp, and easily decimating most of the JSA during "Black Reign", but he is vulnerable to super-strong punches from the likes of Black Adam, being knocked unconscious with one blow several times. During his time as Nuklon, Albert was able to phase through walls; he has lost this power in recent years, or it has been retconned away. Rothstein is also a skilled pilot and mechanic. In the first few years of JSA, he could be seen piloting the JSA's jet, the Steel Eagle, as well as the Star Rocket Racer in JSA: Our Worlds at War, and earlier being Infinity, Inc.'s primary pilot.
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