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For instance: a spell says "Int vs AC" Do you roll raw int + d20 vs AC?

Do you roll Int bonus + d20 vs AC?

Do you roll int bonus+weapon accuracy +d20 vs AC? (This is a question about swordmage, so I have a melee weapon AND cast spells)

Please help. We've been confused on this and it seems like it'd be pretty crazy to just take int bonus +d20

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possible duplicate of How does __(Dexterity) vs. AC work? –  yhw42 May 16 '11 at 20:31
    
I don't think it's a dupe, the other one seems mostly confusion about the __ before (Dexterity) in the red box. This one has a more generic title as well. –  Cthos May 16 '11 at 21:19
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One of the most helpful things our group has done is get a DDI subscription, it generates character sheets with power cards all of the to hit and damage modifiers included right on the power cards. Its about 10$ a month if you go month to month or cheaper if you buy a whole year at a time. –  wax eagle May 17 '11 at 0:22
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1 Answer

How to make attack rolls is described on pages 215-7 of the Rules Compendium in pretty good detail. To sum it up. The Player's Handbook has a smaller version on page 274.

When making an attack roll add the following to 1d20:

  1. The modifier for the attack power the character is using. This will be a stat bonus + 1/2 of the character's level.
  2. The permanent modifiers to the attack.
    • Magic weapon bonus
    • Proficiency bonus
    • Feat bonuses
  3. The temporary modifiers to the attack.
    • Combat Advantage
    • Cover
    • Concealment

Ideally a player should know the sum of #1-2 for each power they possess. Then they'd only need to handle the temporary modifiers.

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Thanks! Didn't read the PHB cover to cover must have missed that page. –  Ben May 16 '11 at 20:58
    
We actually have one player with ddi sub and he prints out our powercadds and such. But I was confused about the exact calcs –  Ben May 17 '11 at 0:51
    
@Ben - don't worry about it. D&D 4e is a pretty complex system. We all miss stuff. Also, welcome to the site! –  Pat Ludwig May 17 '11 at 18:49
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@Ben - If this answers your question, consider marking it as the accepted answer using the check mark under the up/down vote. –  Eugene Katz Jun 17 '11 at 17:48
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