Is there a specific number for how much swords dance boosts physical attack?

Question

Self Explanatory(?)

Comments

It boosts Attack by 2 stages. Is that what you're looking for? Or are you trying to figure out how much of a damage multiplier each stage has or something?

Answer 1

Swords Dance raises the user's Attack by two stages.

Source

This means your attack is doubled. Every stage adds .5x to the multiplier. (One stage is 1.5x, two stages is 2x, etc.)

Answer 2

Adding some additional information to MonkeyBusiness's answer:
The "stages" for stat changes apply the following multipliers to the actual stat:
+6: 4x (8/2)
+5: 3.5x (7/2)
+4: 3x (6/2)
+3: 2.5x (5/2)
+2: 2x (4/2)
+1: 1.5x (3/2)
+0: 1x (2/2)
-1: 0.67x (2/3)
-2: 0.5x (2/4)
-3: 0.4x (2/5)
-4: 0.33x (2/6)
-5: 0.29x (2/7)
-6: 0.25x (2/8)

Basically, if the stage is positive, the multiplier is (2 + x)/2, while if it is negative, it is 2/(2 + x), with x being the stage number. If the stage is 0, there is no multiplier.

Source (in "Stage Multipliers")

Hope this helped!

Answer 3

The exact numbers for each stage:
-6: .25x
-5: ~.29
-4: .33x
-3: .4x
-2: .5x
-1: .67x
0: 1x
1: 1.5x
2: 2x
3: 2.5x
4: 3x
5: 3.5x
6: 4x