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# Thread: Calculating individual item defense.

1. ## Calculating individual item defense.

This seems like it should be straightforward, but I'm noticing some discrepancies between what I would expect certain item defenses to be based on what I see on Arreat Summit and what I see in the actual game. Case in point:

Duskdeep is a unique full helmet with 2 bonuses to its defense: (1) + 30-50% def bonus (2) + 10-20 Integer def bonus

The base defense is 23-26.

Let's forget about ethereal for the time and just limit things to these two bonuses. I have an actual Duskdeep with an overall def of 47, +37%, +11. The game doesn't give us the base def value, but it can be calculated fairly easily.

(24+11)((37+100)/100) = 47.95 >rounded down> 47

However, this formula yields different values compared to what Arreat Summit Lists as the max and min defense range for the Duskdeep Helmet (45-60). Assume a base of 23 with +30% and +10 def values:

MIN: (23+10)((30+100)/100) = 42.9 >rounded down> 42
MAX: (26+20)((50+100)/100) = 69 >rounded down> 69

This obviously doesn't jive. Now you might be wondering what if we add the Int bonus after applying the % bonus, but that formula will not produce the 47 listed on my actual Duskdeep even using the max base def value.

(26*((37+100)/100))+11 = 46.62 >rounded down> 46

I have a feeling I'm doing something wrong here. Anybody know how the game calculates individual armor bonuses?

2. ## Re: Calculating individual item defense.

You dont calculate the +x defense bonus as base defense. Its added after base defense is multiplied with the ED%.

3. ## Re: Calculating individual item defense.

Base defense for items with %enhanced defense is max+1.

27*1,37+11 = 47.

4. ## Re: Calculating individual item defense.

Originally Posted by Kimppi
Base defense for items with %enhanced defense is max+1.

27*1,37+11 = 47.
That's what I was wondering. Thanks!

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