I'd guess over 22inches. His arms dwarf all the other pros onstage next to him. So, that should tell us something.
no dude its all in the shape....
his arms dont even dwarf dareems...
take markus rhul for instance... his arms are always critisized but his arms are huuuuge far bigger than heaths.... i saw his dvd recently ....arms are trmendous but because his chest and delts are so huge the dwarve his arms plus he doesnt hae that round shape heath does... plus hear has a small narrow torso hence his arms look bigger
cover his torso place him next to dareem and viola
...