Combined Magic Accuracy/Damage Calculator Modified by Magical

Monster's stats
Level
HP
Magic Defense
Avoid/Evade
Character's statsv83
Level
INT
LUK
Magic (after buffs)
Spell Mastery (%)
Spell Attack Two Hits
Element Amplification
Calculation
Current accuracy
Accuracy needed for 100%
Accuracy needed for >1%
Hit Rate % (tentative)
Effective Mastery %
Minimum Damage
Maximum Damage

Credit for 100% accuracy goes
to 安心 from 「汝は人狼なりや？」
(via 「メイプル総回診」).