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Rex taming calculatorKnockout

Taming the Rex requires applying enough torpor to knock it out. Use tranquilizer projectiles, then place food in its inventory. The Rex loses Torpor at 0.73 per second while unconscious - stay on top of narcotics.

Taming time57m 59s
Effectiveness98.69%
  1. Wild level150
  2. Tamed level224+74
  3. Max level after leveling297
Torpor15,407-3.05 per second, wakes in 1h 24m 18s

Taming foods

FoodAmountTaming timeEffectivenessFeeding interval
Exceptional Kibble57m 59s98.69%+74 Lvl (224)3m 25s
Raw Mutton1h 10m 1s94.48%+70 Lvl (220)2m 1s
Raw Prime Meat1h 26m 1s91.76%+68 Lvl (218)2m 1s
Cooked Lamb Chop2h 7m 52s83.47%+62 Lvl (212)2m 0s
Cooked Prime Meat2h 51m 49s73.55%+55 Lvl (205)2m 0s
Raw Prime Fish Meat1h 48m 1s63.9%+47 Lvl (197)1m 1s
Raw Meat4h 18m 1s55.25%+41 Lvl (191)2m 1s
Cooked Prime Fish Meat3h 40m 54s30.75%+23 Lvl (173)1m 2s
Cooked Meat4h 18m 1s23.57%+17 Lvl (167)1m 1s
Raw Fish Meat5h 23m 1s16.46%+12 Lvl (162)1m 1s
Cooked Fish Meat5h 22m 31s4.71%+3 Lvl (153)31s

Required narcotics

  • 0Narcotics
  • 0Narcoberries
  • 0Bio Toxin
  • 0Ascerbic Mushrooms

Knockout weapons

  • Bow172 Normal hits0% Death chance
  • Crossbow98 Normal hits0% Death chance
  • Fabricated Crossbow (Tranq Arrow)98 Normal hits0% Death chance
  • Fabricated Crossbow (Tranq Spear Bolt)51 Normal hits0% Death chance
  • Tranquilizer Dart70 Normal hits0% Death chance
  • Shocking Tranquilizer Dart35 Normal hits0% Death chance
  • Tek Bow46 Normal hits0% Death chance
  • Compound Bow127 Normal hits0% Death chance
  • Harpoon Launcher51 Normal hits0% Death chance

Starve & Torpor Timers

Estimated time until optimal feeding point57m 59sFood to consume through starvation 1,449 · Target food level -1,449

Rex taming video guide

More about taming the Rex

Check the taming results to see how long it takes to tame the Rex, what effectiveness you'll achieve, and how many bonus levels it gains. Better food means better results.

Below is a breakdown of knockout weapon requirements for the Rex across various creature levels. Always pace your shots. Torpor takes time to apply, and over-shooting can be lethal.

To simplify the knockout, immobilize the Rex first with Chain Bola or Bear Trap. Alternatively, use a Tusoteuthis to airlift it into a pre-built trap.

The table shows how many sedatives you'll need to keep the Rex unconscious through the full taming duration. Bio Toxin is twice as potent as Narcotics (80 vs 40 Torpor per use), while Narcoberries work in a pinch at just 7.5 Torpor each. At 0.73 Torpor drain per second, apply narcotics proactively - a wakeup mid-tame wastes everything.

Use the torpor and starve timers to track your Rex tame in real time. Torpor monitoring prevents premature wakeups. The starve timer is for the starve-tame method - let Food drop, then load all kibble at once to avoid waste.

Found throughout the ARKs, the Rex is a tamable, carnivore creature in ARK: Survival Ascended. Classified under the DMG group.

With 1,100 base Health, the Rex is quite durable. With 100% base Melee Damage, the Rex has solid damage output. Stamina sits at 420 base, providing solid stamina reserves. Weight capacity starts at 500, giving it massive inventory space.

Taming the Rex requires rendering it unconscious first - use Tranq Arrows, Darts, or Shocking Tranq Darts to apply torpor. Feed it Exceptional Kibble for the fastest tame and highest effectiveness bonus.

After taming, the Rex is valued for its harvesting efficiency, collecting key resources faster than most tools. It reproduces by laying eggs, which must be incubated between 32°C and 34°C. Defeating one in the wild grants 30 base XP. It can be cloned at a Cloning Chamber for 0.87 Element plus 0.01 Element per level.