Alien Creature Size Comparison (Official Lengths)
How big is a Xenomorph? Compare 12 Alien life stages and ships from Colonial Marines manuals and studio specs, from egg to queen plus Nostromo scale here.
Visual comparison
All values
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| Name | Value | Context | Source |
|---|---|---|---|
| Ovomorph egg Holds one facehugger. | 0.8 m (2.6 ft) | Stage one, hive egg | Aliens Colonial Marines Tech Manual p. 84: 0.8 m |
| Facehugger Body plus tail extended. | 0.9 m (3 ft) | Stage two, parasitic form | Colonial Marines Tech Manual: 0.9 m with tail |
| Chestburster Under 12 inches at emergence. | 0.3 m (1 ft) | Stage three at birth | Alien film production notes: under 0.3 m |
| Chestburster grown Skull blade and claws present. | 1.2 m (3.9 ft) | Pre-molt large infant | Kaiju tech compendium: 1.2 m |
| Drone Xenomorph 1979 Bolaji Badejo suit plus head crest. | 2.4 m (7.9 ft) | Original Big Chap | Giger suit spec: 2.4 m (8 ft) |
| Warrior Xenomorph Slightly shorter than the 1979 drone. | 2.1 m (6.9 ft) | Aliens hive soldier | Cameron production specs: 2.1 m (7 ft) |
| Runner Alien Quadruped host gives longer back. | 2 m (6.6 ft) | Alien 3 dog-host form | ADi studio specs: 2.0 m standing |
| Predalien Mandibles and dreadlocks add bulk. | 2.5 m (8.2 ft) | Predator-host hybrid | AVP-R studio specs: 2.5 m |
| Xenomorph Queen (Aliens) Crest and crown add height. | 5.5 m (18 ft) | Hive queen standing | Cameron specs via IGN guide: about 5.5 m |
| Xenomorph Queen AVP Taller than the 1986 queen. | 6 m (19.7 ft) | Streamlined AVP design | AVP production notes: 6.0 m (20 ft) |
| Engineer (Space Jockey) Matches warrior height. | 2.1 m (6.9 ft) | Prometheus Engineer | Prometheus press kit: 2.1 m actor scale |
| Nostromo (ship for scale) Ship entry so creatures read against metal. | 246 m (807.1 ft) | Commercial towing vessel | Alien Tech Manual: 246 m |
About this converter
Alien sizes follow the life cycle, and the manuals pin each stage. The egg stands 0.8 meters. The facehugger stretches 0.9 with its tail. The chestburster starts under 0.3 meters at birth and grows past 1.2 before it molts. Adults cluster near two meters. The runner from Alien 3 stands 2.0, the Aliens warrior 2.1, the 1979 drone 2.4, the Predalien 2.5. Queens break the line at 5.5 meters for the 1986 design and 6.0 for the streamlined AVP design. Engineers at 2.1 match the warriors man to man. The Nostromo at 246 meters closes the table so the hive reads against a ship.
How to use it
Pick two entries and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. One box holds a count of the first creature, one holds the matching count of the second, one holds the length in the chosen unit. Try 1 queen against drones to see how many soldiers stack to one mother.
Heights mix standing height and length with tail where the manual states it. Facehugger 0.9 meters is tail extended. Queen figures vary by film because each suit was rebuilt. This table uses the two most cited builds and labels them. Newborn and Deacon forms have no stable studio height and stay out.
FAQ
How tall is a Xenomorph drone?
2.4 meters for the 1979 Big Chap suit, 2.1 for Aliens warriors.
How big is a facehugger?
About 0.9 meters with the tail extended, per the Colonial Marines Technical Manual.
How tall is the Alien queen?
About 5.5 meters for Aliens and 6.0 meters for the AVP build.
How big is a chestburster at birth?
Under 0.3 meters, or under 12 inches, before its growth spurt.
Sources
- Aliens: Colonial Marines Technical Manual, HarperCollins 1996 pp. 84-90 (egg, facehugger, drone specs)
- Alien 1979 and Aliens 1986 production notes via IGN Alien Guide (chestburster, drone, warrior, queen)
- AVP and AVP-Requiem studio specs (Predalien 2.5 m, AVP queen 6.0 m)
Last verified: 2026-10-05 · 12 entries
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