MapleStory Calculator [Version 1.00b]

answered in quote.

Is there an issue with Savage Blow's Venom Chance? There shouldn't be.

Here's the problem:

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As you can see, my range is 500~1000, I'm lvl 50 and the monster is lvl 100, it has 200 wdef.

My range should be 500(1-(100-50)/(200-100))-200*.6 = 130, but your program does it as
500-200*.6 = 380

Max should be 1000(1-(100-50)/(200-100))-200*.5 = 400, but it reads it as 1000-200*.5 = 900

Its not taking the level multipler into effect. Now if I reduce my level to 1 and the monster's to 101 I get 1 damage

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Most of the time the minimum displays as 2^31

And if you did the 2^31 just for fun, maple uses 2^31-1 due to a 0 placeholder.

Alright. The first issue in that image is that it's calculating minimum damage as 0 because there's no skill value. Something I'll look into fixing, though I didn't implement that fallthrough case because no one cares about the damage of their regular attack.
The second issue involving the defense is I forgot a cast, so it considered my (mlvl - clvl) / (200 - mlvl) to be integer 0.
The third issue is a divide by zero/infinity that displays as -2^31
The fourth issue is I mixed up minimum hits and maximum hits display. They should be swapped. Minimum hits to kill is 4. Maximum hits is -2^31, i.e. divide by zero -> Infinity (since your minimum skill damage is 0). Average hits is 13.

What? Hits to kill is -2^31 minimum, 2 maximum, 6 average? 40% chance to KB at 1 damage?

...
JT is not going to be happy.

Edit: After playing around a bit, I found one problem. If you don't select a skill, whatever you use to compute KB value and hits to kill returns 0 damage. The issue with level defense still exists, though.

40% chance to kb is inherent at that set up because it calculates using two values;
non-critical, and critical; since there is no skill selected, the non-critical damage is assumed at 0 since there's no skill% selected. i.e. minimum * skill% = 0; however, when critical is accounted for, you get minimum * (skill% + critical% * rate% / 10000) = 40%

What's this about level 200 monsters and 3819 accuracy? I don't quite understand how you got that. The only level 200 monsters that exist are the ones that were meant to never die. The reason you need 3819 accuracy is they have 999 avoid. Not because they're level 200.

Oh, and Devil's Sunrise, your display issue is because you have your view set on Windows Classic. This thing probably only works on Windows XP view.