Hellboy possesses superhuman strength, endurance, a degree of resistance to injury, and a healing factor that allows him to heal quickly from injuries. He also has the innate ability to comprehend ancient and magical languages. The extent of his strength is unclear, but he has torn down a large tree and hurled it at an opponent and has lifted massive stones. He has also picked up and thrown opponents weighing at least four to five hundred pounds. Hellboy has a high degree of resilience to injury. He can withstand powerful blows that would severely injure or kill a human. He survived being shot many times in the chest with an MG 42 machine gun before destroying it. He has survived being impaled through the chest with a sword, severe werewolf mauling, being beaten unconscious with heavy iron tongs, falling from extreme heights, being crushed by boulders, and more. In the film version it is stated that Hellboy is immune to all forms of fire and burns, including Liz Sherman's flames, and electrocution. Despite his ability to quickly recover from seemingly mortal wounds, he is far from invulnerable, and can be injured or bloodied by conventional weapons. It is revealed to Baba Yaga by the dead Russian nobility that Hellboy may not be slain even through supernatural means and that he appears to be as deathless as her warrior, Koschei the Deathless.
Hellboy ages very differently from humans. In the story Pancakes he is two years old but appears to be somewhere between 6 and 10 human years old. In Nature of the Beast, set in 1954, the ten-year-old Hellboy appears fully grown. His rapid physical maturation is in contrast to his actual rate of aging however, which seems to be much slower than humans. Throughout the sixty-year span of time depicted in the comics, he does not age beyond the plateau of physical maturity. This mystical aging process is similar to the other demons and supernatural beings that populate Hellboy's world. The lifespan of a Demon, or Half-demon as Hellboy's mother was human, are left undefined within the comics and seem to range from decades to many thousands of years. In the movies, Hellboy's aging process is described by on BRPD as "reverse dog years".[volume & issue needed]
In addition to his natural physical abilities, Hellboy carries a variety of items in his utility belt and jacket that can be used against various supernatural forces. He has been known to carry holy relics, horseshoes, various herbs, and hand grenades. Though he commonly carries an oversized revolver, Hellboy freely admits to being a lousy shot and often fights hand-to-hand, preferring to use short-ranged physical weapons like swords, spears, and his massive stone fist over firearms. Hellboy's lack of formal combat training and education is compensated for by his decades of experience as a paranormal investigator, though encounters with unfamiliar threats have often forced him to resort to improvisation and using his wits.