If you go by the usual rules for size, it is twice as big in every dimension. This is compatible with things like the 20 foot range of a large Reach weapon.
On the other hand, this makes very little sense, because such an item would weight eight times as much, not twice as much.
So maybe it's twice as long but not twice as thick?
Its 3 size categories smaller than the wielder. PF doesn't list dimensions, and as shown above the basic rules don't scale well. Even creatures in the same size category could have weapons of vastly different sizes if we want realistic comparisons.
As someone else pointed out, per the information provided by Enlarge Person, increasing from medium to large should increase the weight by eight times (2x2x2, double the width, double the height, double the length of the weapon.) That's going from 25 pounds to 200 pounds in weight. While the actual "size" of the thing is a guess, based on its already notable heft, it's going to look comically large in the hands of a medium creature.
All of this is moot, however, since according to the PRD > Equipment > Weapon Size, you cannot wield a two-handed weapon that is sized larger than you. A medium creature could wield a large one-handed axe as a two-handed weapon, but two-handed is too much.
Even if you allow this, there's a -2 penalty for using weapons that aren't your size and this particular weapon requires a 19 strength to effectively wield even the medium version (and a 17 for the small version.) At 200 pounds, the large version would weigh almost half as much as a 21 strength character's entire heavy load amount (which is also the amount they could lift over their head) making it wildly impractical as a weapon.
Ultrace, it might have been overlooked in the chat about physics, but the OP mentioned that the character is a titan mauler, a class with a feature (massive weapons) that allows the character to wield oversized two-handed weapons at a hefty penalty (-4 on top of the -2 for oversized and on top of the insufficient strength and encumbrance penalties). It's doable with sufficient planning.
Thanks for pointing that out, all I focused on was the "medium" part. With that information, this character is looking at probably a -5 attack penalty (as by the time they can use this feature, the mauler starts getting reductions in the penalty), and if they don't have a minimum of 21 strength you can tack on another -2 for a total of -7 at levels 3-5.
RAW it's totally doable, but even for a titan mauler this seems almost silly. It's the heaviest non-siege weapon in the SRD, 25% heavier than the Dwarven longhammer or the portable battering ram that orcs use. Multiplying its size up to large is pretty ridiculous, but this is the sort of thing that happens in games... :)
So, it seems that from Medium -> Large would multiply every dimension by 1.25 (1.25x1.25x1.25 ~ 2).
The chart would be as follows (approximations ahead):
Sze -- weight mult -- dimension mult
Tny -- x 1/10 -- x 1/2
Sml -- x 1/2 -- x 3/4
Med -- x 1 -- x 1
Lrg -- x2 -- x 1 1/4
Hug -- x5 -- x 1 3/4
Grg -- x8 -- x 2
Col -- x12 -- x 2 1/4
Probably some reasonable house rules about reach and larger creatures lurking around here somewhere.
Thanks for pointing that out, all I focused on was the "medium" part. With that information, this character is looking at probably a -5 attack penalty (as by the time they can use this feature, the mauler starts getting reductions in the penalty), and if they don't have a minimum of 21 strength you can tack on another -2 for a total of -7 at levels 3-5.
RAW it's totally doable, but even for a titan mauler this seems almost silly. It's the heaviest non-siege weapon in the SRD, 25% heavier than the Dwarven longhammer or the portable battering ram that orcs use. Multiplying its size up to large is pretty ridiculous, but this is the sort of thing that happens in games... :)
Pretty ridiculous indeed, but that's Pathfinder. Now if you'll excuse me, I have to feed my giant Pac-Man eidolon.
The Iconic Barbarian wields a Large bastard sword.
Going by the Enlarge Person rules (multiplying the mass of the medium sized version by 8), that means it weighs 48 pounds and is between 7 and 8 feet long.
(Pathfinder doesn't model weapon weight very well. Swords of this size actually exited, real people used them and the largest of them weighed 15 pounds.)
It's probably not scaled up in each dimension the same way, and different parts don't need to scale the same way. The shaft wouldn't necessarily need to be twice as thick if it's twice as long for example.
Given the way reach doesn't scale as fast as size does at higher size categories I'd assume something like *1.5 length if it's *2 weight.
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Each weapon's object size is based on it's designation. For a light weapon, it is two size categories smaller (Large weapon is a small object), for a One Handed Weapon, it is one size category smaller (Large weapon is a Medium object), and for a Two Handed Weapon, it is the same size as the wielder it was made for (Large Weapon is a Large Object).