Warhammer 40k Base Sizes Update
What actually changed in the latest official base size list, the general size chart for checking a model, and where Games Workshop publishes the authoritative version.
The October 2026 update (v1.3) changed exactly one base: the Ork Wazbom Blastajet moved from a 150×95mm oval to a 120×92mm oval - matching the Dakkajet, Burna-bommer and Blitza-bommer. If you based it on the old guides quoting 150×95, the model is now officially on the smaller oval.
Where the official list lives
Stop trusting blog screenshots - this is the source of truth.
Games Workshop publishes base sizes inside the Warhammer 40,000 Event Companion on the Warhammer Community site. Since the 2025 edition it comes as four documents; the main Event Companion contains the full unit-by-unit base size list for every faction, updated with each revision (v1.3 is current as of October 2026).
New kits ship with their correct base, but for second-hand buys, conversions and third-party models the Event Companion is the only reference that counts in matched play.
General size chart
The standard bases in 40k and what typically goes on them.
| Base | Typical use | Examples |
|---|---|---|
| 25mm round | Light infantry, swarms, older kits | Cadian Shock Troops, Gretchin, Kabalite Warriors |
| 28.5mm round | Older GW infantry, many xenos | Termagants, Guardian Defenders, Scouts |
| 32mm round | Standard infantry since 2015 | Intercessors, Necron Warriors, Ork Boyz |
| 40mm round | Heavy infantry, most characters | Terminators, Custodian Guard, Captains |
| 50mm round | Heavy suits, big characters | Obliterators, Tyranid Warriors (melee) |
| 60mm round | Monsters, walkers | Dreadnought, Helbrute, Hive Tyrant |
| 80mm round | Large monsters, sentinels | Scout Sentinels, Ghazghkull |
| 90mm round | New-style dreadnoughts, speeders | Redemptor & Ballistus Dreadnoughts |
| 100mm+ round | Armigers, grav tanks, primarch-scale | Armiger-class Knights |
| 90×52mm oval | Vehicles, walkers | Bikes, small walkers |
| 120×92mm oval | Flying vehicles & walkers | Ork flyer wings (incl. Wazbom Blastajet per v1.3) |
| 170×105mm oval | Knight walkers, big monsters | Questoris-class Knights |
| 30 / 55mm clear round | Flight stands | Flying infantry, skimmers |
| "Hull" (no base) | Most tanks & transports | Russes, Rhinos, Astraeus - measured from the hull |
What the "update" means in practice
Base size changes are rare and targeted.
GW revises the Event Companion a few times a year, and most revisions touch almost nothing. A change only matters for the unit it names: the Wazbom Blastajet's move to 120×92mm is the entire Orks diff in v1.3 - everything else keeps its listed size. Older blogs and resin-base listings still quoting the old dimension are simply stale.
FAQ
What is the latest Warhammer 40k base sizes update?
Event Companion v1.3 (October 2026): the Ork Wazbom Blastajet moved from 150×95mm oval to 120×92mm oval. Nothing else changed in that revision.
Where is the official 40k base size list?
In the Warhammer 40,000 Event Companion, free on the Warhammer Community site - the main document includes the full unit-by-unit table for every faction.
My model came with a different base than the chart - which is right?
The Event Companion is the authority for matched play; kit contents sometimes lag revisions. When in doubt, match the document, not the sprue.
Can I magnetize or rebase my models?
Yes - rebasing to the current official size is standard practice and legal everywhere; in casual games anything agreed with your opponent works.