You can try to get formula for it, but to do this you need to know these stats. The thing is, I do not think it is possible, because they are not linear function or anything like this.
For example:
Warrior on level 1 have 1544 hp. Level 2 have 1632 hp.
If we consider that 1544 is the base then the difference per level is 88.
So in that case level 3 should have 1720 hp and level 4 should have 1808.
In game level 3 have 172
5 and level 4 have 18
24, so it is not linear increase.
So lets try something different. I opened up Excel and after some testing it think the formula is: previous level hp + 5,7%.
| Level | Health points |
| 1 | 1544 |
| 2 | 1544*1,057 = 1632,008 |
| 3 | 1632*1,057 = 1725,032 |
| 4 | 1725*1,057 = 1823,359 |
| 5 | 1823*1,057 = 1927,2908 |
| 6 | 1927*1,057 = 2037,1464 |
| 7 | 2037*1,057 = 2153,2637 |
| 8 | 2153*1,057 = 2275,9997 |
| 9 | 2275*1,057 = 2405,7317 |
And so:
Level 10 = 2453
20 = 4427
30 = 7706
40 = 13414
50 = 23352
60 = 40651
Although this formula is off. My 36 level warrior have 10364, where this formula gives ~10746.
Also as you can see, according to formula level 4 have ~1823 HP when on Tera EU it is 1824.
I think that this formula for level 60 may be off by few thousands. Still having tweakable formula is always better than hard coded data. If someone gets formulas for other classes (well, it may be the same but I do not have will to create another characters and get them to ~5 level) and mana.
Edit:
Tested with sorcerer, for level 33 formula is off by ~150 HP. I think that we can assume that Previous level hp * 1,057 is almost correct. Changing the 5,7% to smaller number would make first levels more off.
Can someone tell me how much this formula is off by the level 60?
Also base hp for all classes would also be nice. I know Warrior (1544) and Sorcerer (1316). Maybe later i will check this myself, but it would make work easier for me.