Hot Wheels track, car, blister card and case sizes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/hot-wheels/  (CC BY 4.0)
Basis: Mattel product pages (piece lengths), retailer listings (cases, card protectors), maker design values (garage clearance)
Catalog version: 2026-10-20

Sizes: see table below
- Straight track comes in 9 in (228.6 mm) and 12 in (304.8 mm) pieces with separate connectors; Track Builder Unlimited connectors work with all Hot Wheels track (Mattel).
- Track width, lane width, rail height and connector size are not published by Mattel: a measured Xem scan of the orange track and connector is planned (it is the most-asked Hot Wheels number).
- Cars: a garage that 'holds most cars' is 78 × 40 × 26 mm inside (44 tall for tall castings), maker design value; a retailer lists a basic car at 89 × 38 × 38 (likely rounded / packaged).
- Blister card 108 × 165 mm (4.25 × 6.5 in); card protector bubble 95 × 146 × 44.5 inside. 100-car carry case 343 × 152 × 282 mm outside.

item  length_mm  width_mm  height_mm
straight track, short  228.6  None  None
straight track, long  304.8  None  None
garage clearance for most cars (maker)  78  40  26
blister card (mainline)  165.1  108.0  None
card protector interior  146.1  95.3  44.5
100-car case (outside)  342.9  152.4  281.9

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Mattel: Track Builder straight track (9 in and 12 in pieces) — web — Publisher's page; dimensions are facts — https://shop.mattel.com/products/hot-wheels-track-builder-straight-track-with-car-bht77
- Mattel: Track Builder Unlimited straight track pack — web — Publisher's page; dimensions are facts — https://shop.mattel.com/products/hot-wheels-track-builder-unlimited-straight-track-pack-hfd00
- Printables (maker design value): Printable garages for Hot Wheels — web — Publisher's page; dimensions are facts — https://www.printables.com/model/558612-3d-printable-garages-for-hot-wheels-and-similarly-
- Walmart (Protech listing): Card protector for carded Hot Wheels 4.25 × 6.5 — web — Publisher's page; dimensions are facts — https://www.walmart.com/ip/Protech-SSCAR-Storage-Display-Car-Case-for-Carded-Hot-Wheels-4-25-W-x-6-5-H-x-1-75-D-25-Pack/193695882
- Target (spec tab): Hot Wheels 100-car case — web — Publisher's page; dimensions are facts — https://www.target.com/p/-/A-14033027
- Entertainment Earth (listing): Hot Wheels basic car — web — Publisher's page; dimensions are facts — https://www.entertainmentearth.com/product/hot-wheels-basic-car-2024-wave-6-case/mtl2593f2

Xem Studio scan: not planned; the official CAD above covers it.
API: https://xemstudio.com/api/geometry?object=hot-wheels