I am reading the 5e rules, and I keep seeing how you can add proficiency bonus to attack rolls checks with weapons you are proficient in and skill checks in skills you are proficient in, but I can't find anything on what this bonus ACTUALLY is. How do you determine what the numerical actual bonus you add to your roll is? And when all is it used?
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Proficiency bonus is noted in your character advancement table (in Character Creation file) as "Proficiency Bonus", and that is universal for your character level. For example, according to the table, a 3rd-level character gets +2 for proficiency bonus, because the table says so. For convenience of single-classed characters, you can also look up your proficiency bonus for your level in your class advancement table, which is present in the Classes file.
Thus, a 5th-level Fighter with Strength 18(Modifier is +4) wielding his greatsword makes attack roll with
Proficiency Bonus represents your experience from a roleplaying viewpoint, and your power curve from a game design viewpoint.
In DnD3e, for weapon using classes it was your base attack bonus, together with your feat bonus, ability improvement and your magic item it was quite progressive. You gained a level, your attack improved by more than 1.
This math in editions 3 and 4 meant that the threats you ran away from on level 1 became easily trivial. By level 11 your attack bonus, and your defenses were about 10 higher than on level 1. (DnD4 attack increase: 5 from level, 1 from ability, 3 from item, 2 feat)
Basically what was an easy "half your level rounded down" in DnD4e, is now a bit less catchy "1, plus your level divided by 4, rounded up".
Proficiency is explained in the Basic Rules, free from Wizards of the Coast web site and in the Players Handbook. (The way Proficiency works is the same in both sources). The Proficiency Bonus reflects via game mechanics how much better a character is at some things (attacks, saving throws, spell effects) due to the level of experience, and also how much better a character is at certain skills either due to choice, experience, background, class, and/or race.
Here is how you calculate and use your proficiency bonus from the Basic Edition rules:
To find out your proficiency bonus, you need to look at the chart at the beginning of your class description in the PHB (regular or basic edition). Currently, they are the same for all classes (and in fact are class-independent), so your proficiency bonus scales like this:
To answer your specific question:
When you have 'proficiency' in a skill, you add your proficiency bonus to that skill. In your example, for perception you take your Wisdom modifier, and you add to that the proficiency bonus in the above table. The bonus is calculated based on your character level, not class level, so it's the same whether or not you multi-class.
If you were a 3rd level Elf with a Wisdom of 16(+3), your final perception score would be:
Wisdom Mod (+3) + Proficiency Bonus (+2) = +5 Perception
You add your proficiency bonus to attack rolls with weapons you are proficient in. This is determined by your class, and will be outlined in the class description in the PHB.
protected by wax eagle♦ May 28 '15 at 12:02
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