How to calculate Hit Points

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How to calculate Hit Points

Postby Kemian » Thu Sep 25, 2014 6:10 pm

Since so many people seem to forget here is a reminder:

At 1st level you get the full HP for your class plus Con bonus plus any additional HP you would gain as a result of additional Feats:

eg: a first level Fighter with a Constitution of 14 and the Improved Toughness Feat would start with 10 + 2 + 1 = 13 HP.

Every Even level you gain Class HP/2 plus Con bonus plus any additional HP you would gain as a result of additional Feats:

eg: The same Fighter taking a second level of fighter would have 13 + 5 + 2 +1 for a total of 20 HP.

Every ODD level other than first you gain Class HP/2 +1 plus Con bonus plus any additional HP you would gain as a result of additional Feats:

eg: The same Fighter taking a third level of fighter would have 20 + 6 + 2 + 1 for a total of 29 HP

The additional HP comes on ODD levels not even. If you guys could try to keep that straight it would make level ups a bit less confusing.

Thank you,

Kemian
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Re: How to calculate Hit Points

Postby Ian » Fri Sep 26, 2014 9:48 am

What Mark said.

It might help to explain why the extra hit points happen, and why they happen when they do. Some math follows; if math frightens you, you can stop reading now. *g*

Math wrote:The average of 1d6 is not 3, but 3.5. The same applies to all other dice--because the range starts at 1 instead of 0, the average is a fraction.

At level 1, this is irrelevant because you get the full die. Afterwards, though, you start adding fractions of a hit point, which works the same way as fractional cross-class skills: you ignore the fraction when you have it, but it factors into the level-up math.

So a level 2 rogue has 9 hp (6 + 3.5 = 9.5), and a level 3 rogue has 13 hp (6 + 3.5 + 3.5 = 13). You're not truly "rounding" up and down on alternating levels, you're just ignoring anything that comes after the decimal point.

Monsters and NPC classes do get the "round-up" on even levels instead of odd, but that's because they don't get maximum HP at level 1. For example, a 3 HD fey has 10 hp (3.5 + 3.5 + 3.5 = 10.5), while a 4 HD fey has 14 hp (3.5 + 3.5 + 3.5 + 3.5 = 14). They have fractional HP on odd levels, and round numbers at even, hence it looking like they get an extra hit point on a different schedule.
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