Just to clear something up, it would be a 1/16 chance, not 1% as the calculator states
Quote:
Provided the battle isn't rigged to always use minimum damage, the current damage value D is altered using a random number 0 ≤ R ≤ 15:
D' = (D * (100-R)) ÷ 100
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This basically means there are 16 possible damage outcomes.
Source.