Fortitude

Fortitude is a measure of your resistance to the Weather, Torpidity, and Disease. A higher Fortitude increases your natural Hypothermic and Hyperthermic insulation, reduces rate of defecating near  Tyrannosaurus roar, and lessens the effects that you receive from  Hypothermia and  Hyperthermia. It also gives you resistance to  Torpidity-increasing effects such as consumption of  Narcotic, hits from  Tranquilizer Arrow or  Slingshot, Scorpion stings and other Torpidity-inducing attacks from creatures.

Increasing

Each level point spent increases fortitude by 2. This in turn increases the hypothermal and hyperthermal insulation by 4.5. In the HUD you will see rounded down integers. Bear in mind to resist hypothermic effects at -5 °C(23 °F), hypothermal insulation of at least 200 is required - so you will not be able to resist all weather effects using fortitude alone without adding an obscene amount of points to the skill.

Points Spent	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25
Fortitude	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	40	42	44	46	48	50
Hypothermal and Hyperthermal Insulation	4	9	13	18	22	27	31	36	40	45	49	54	58	63	67	72	76	81	85	90	94	99	103	108	112

Points Spent	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50
Fortitude	52	54	56	58	60	62	64	66	68	70	72	74	76	78	80	82	84	86	88	90	92	94	96	98	100
Hypothermal and Hyperthermal Insulation	117	121	126	130	135	139	144	148	153	157	162	166	171	175	180	184	189	193	198	202	207	211	216	220	225

Utility

Each point spent on fortitude will increase your knock-out threshold by 1. This also reduces torpidity gain rate and increases torpidity drop rate.

A Human with 0 points in fortitude will be knocked-out once his torpidity reaches 50 points, a human with 1 point in fortitude requires 51 torpidity to fall unconscious and so on.

Torpidity also seems to reduce the chance of catching diseases like Mega Rabies and Swamp Fever. This is yet to be tested.

Notes

• Various Armors will also increase (or decrease) your Hypothermic and Hyperthermic insulation.
• Food dishes can be used to temporarily increase your resistance to extreme temperatures:  Fria Curry gives Hypothermic insulation, and  Calien Soup gives Hyperthermic insulation.
• Inside a building insulation is increased by 112 Hypothermic and 56 Hyperthermic.
  • Staying inside a stone or metal building on Scorched Earth almost always results in overheating. Insulation is unlikely to resolve this problem.
• While Fortitude reduces the  Torpidity gained from various damage sources, it does not decrease the damage you receive.
• As of Patch 280.114 natural insulation from fortitude was increased by 8% and the knock-out threshold now increases with fortitude as well.

Changelog

Patch	ARK: Survival Evolved Changes
172.3	10% global insulation effectiveness boost.
174.0	Increased effectiveness of temperature insulation by 20%.
188.1	Fortitude stat now has 1.5x the insulating effect as previously.