There's a lot of EHP calculators out there, but not all the time do people want to sit down and plug their stats into a calculator to get an idea of their effective health.
It seems like it is really complicated to determine your EHP, but it's really not that hard, and you can do a really good estimation of it in your head if you're just trying to determine what's better between two pieces of gear.
For instance, if you have 670 resists, 8900 armor and 43000 health how much EHP does that give you? If you know the formulas for damage resistance you might try and figure it out like:
670 resists means against a level 63 monster I take 1- (670/(670+315)) = 32% damage
8900 armor means against a level 63 monster I take 1-(8900/(8900+3150)) = 26% damage
Between armor and resists I take 32% * 26% = 8.3% damage
43000/(0.0832) = ~517k EHP
That's not something you can easily do in your head, but I think that's how most people expect to try to figure out EHP. There is a simpler way though.
1: Take your resists, and divide by 300, then add 1. (670/300 + 1 = 2.23 + 1 = 3.23)
2: Take your armor, and divide by 3000, then add 1. (8900/3000 + 1 = 2.97 + 1 = 3.97)
3: Multiply those numbers together (3.23 * 3.97 = 12.82)
4: Multiply your health by that number 43000*12.82 = 551k
5: For level 63 mobs, take off about 6%, for level 62 mobs, take off about 4%, for level 61 mobs take off about 2%. (This is the only real bad math to make estimation easier.)
6: 551k * 0.94 = 517k
Just estimating you get with no calculators and no significant effort:
1: 670 is twice 300, and 70 is about a quarter of 300, so 2.25, plus 1 is about 3.25
2: 8900 is about 3 times 3000, less 100 which is 1/30th of 3000, so about 3-0.033 or 2.97 plus 1 for about 3.97
3: 3.97 is close enough to 4, 4 times 3.25 is twice 6.5 or about 13.
4: That means my EHP is about 13 times my health, which is enough info for a lot of decisions, but to get my EHP, 13 times 43k is about 430k + 120k or about 550k
5: To get it with relation to 63 mobs, generally shave off about 6 percent, so like 30k or so, (10 percent is 55k, so we take off a little more than half that) so we have about 520k
If you have passives and stuff, like a 30% damage reduction, and you reduce mob damage by 20%, just tally that up before hand 1.2/0.7 = 1.71 and multiply it to the end result. Most of the time though that's totally unnecessary because when you want to estimate this on the fly you're comparing stats with static passives.
Note: You can do the second process and get accurate results by skipping step 5, and dividing by 315/310/305 instead of 300. However that's a bit more challenging to do in your head.
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It seems like it is really complicated to determine your EHP, but it's really not that hard, and you can do a really good estimation of it in your head if you're just trying to determine what's better between two pieces of gear.
For instance, if you have 670 resists, 8900 armor and 43000 health how much EHP does that give you? If you know the formulas for damage resistance you might try and figure it out like:
670 resists means against a level 63 monster I take 1- (670/(670+315)) = 32% damage
8900 armor means against a level 63 monster I take 1-(8900/(8900+3150)) = 26% damage
Between armor and resists I take 32% * 26% = 8.3% damage
43000/(0.0832) = ~517k EHP
That's not something you can easily do in your head, but I think that's how most people expect to try to figure out EHP. There is a simpler way though.
1: Take your resists, and divide by 300, then add 1. (670/300 + 1 = 2.23 + 1 = 3.23)
2: Take your armor, and divide by 3000, then add 1. (8900/3000 + 1 = 2.97 + 1 = 3.97)
3: Multiply those numbers together (3.23 * 3.97 = 12.82)
4: Multiply your health by that number 43000*12.82 = 551k
5: For level 63 mobs, take off about 6%, for level 62 mobs, take off about 4%, for level 61 mobs take off about 2%. (This is the only real bad math to make estimation easier.)
6: 551k * 0.94 = 517k
Just estimating you get with no calculators and no significant effort:
1: 670 is twice 300, and 70 is about a quarter of 300, so 2.25, plus 1 is about 3.25
2: 8900 is about 3 times 3000, less 100 which is 1/30th of 3000, so about 3-0.033 or 2.97 plus 1 for about 3.97
3: 3.97 is close enough to 4, 4 times 3.25 is twice 6.5 or about 13.
4: That means my EHP is about 13 times my health, which is enough info for a lot of decisions, but to get my EHP, 13 times 43k is about 430k + 120k or about 550k
5: To get it with relation to 63 mobs, generally shave off about 6 percent, so like 30k or so, (10 percent is 55k, so we take off a little more than half that) so we have about 520k
If you have passives and stuff, like a 30% damage reduction, and you reduce mob damage by 20%, just tally that up before hand 1.2/0.7 = 1.71 and multiply it to the end result. Most of the time though that's totally unnecessary because when you want to estimate this on the fly you're comparing stats with static passives.
Note: You can do the second process and get accurate results by skipping step 5, and dividing by 315/310/305 instead of 300. However that's a bit more challenging to do in your head.