Dwarf Size: 60,000 (Give or take for broadness/height variance. Possible ~93,750 size at max range, if I'm reading things right.)
Weapon: Size (single-handed)
Pike: 62,500 (77,500)
Halberd: 62,500 (77,500)
2H Sword: 62,500 (77,500)
Longsword: 52,500 (57,500)
Maul: 62,500 (77,500)
Great Axe: 62,500 (77,500)
Large Dagger: 5,000 (27,500)
Scourge: 22,500 (27,500)
Flail: 42,500 (47,500)
Morning Star: 32,500 (37,500)
Scimitar: 32,500 (37,500)
If I'm reading things right, a dwarf's height and broadness can be 75-125% default size. If both are applied, that means a dwarf can be between 33,750 and 93,750 size. The largest of dwarves can single-hand any weapon, and equip a shield or another weapon in the off-hand. An average dwarf uses most foreign weapons as a multi-grasp. A very small dwarf cannot use the majority of weapons, even domestic weapons (which makes me think I'm interpreting the numbers wrong). However, the chances of getting both broadness and height at minimum is 1/14, and genetics do seem to play some role, making exceptionally small dwarves rare and/or evolution'd away during worldgen. I've heard conflicting reports about dual-wielding weapons and shields, and I know that high/broadness plays a roll in weapon size, but the exact relation is unknown.