Car cup holder sizes: published ranges — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/car-cup-holder-sizes/  (CC BY 4.0)
Basis: Not standardized. Published figures: an expandable cup-holder insert sized to fit vehicle cup holders 2.6–3.7 in (66.0–94.0 mm); a 40 oz Stanley Quencher, made to fit cup holders, is 75 mm across its base
Catalog version: 2026-10-20

Sizes: see table below
- Car cup holders are not standardized. The figures here are ranges and sizes that products publish so they fit most holders; none is a holder size.
- Custom Accessories' expandable jumbo cup holder has a base that expands from 2.6 to 3.7 in (66.0–94.0 mm) to fit vehicle cup holders.
- Stanley's 40 oz Quencher H2.0 is 2.95 in (75 mm) at the base (REI listing), the size that made it fit most car cup holders.
- No holder geometry is drawn. For an insert or adapter, measure the top and bottom diameters and the depth of your holder, or wait for a scan.

figure  in  mm  from
expander base range (fits vehicle holders)  2.6–3.7  66.0–94.0  Custom Accessories (Ace)
Stanley Quencher 40 oz base  2.95  75  REI

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Custom Accessories (listing by Ace Hardware): Expandable jumbo cup holder: base expands 2.6–3.7 in to fit vehicle cup holders — web — reference [verify license at link] — https://www.acehardware.com/departments/automotive-rv-and-marine/automotive-accessories/interior-automotive-accessories/8108507
- REI: Stanley Quencher H2.0 FlowState tumbler 40 fl oz: 10.25 in tall (12.5 with straw), 2.95 in (75 mm) at the base — web — reference [verify license at link] — https://www.rei.com/product/220438/stanley-quencher-h20-flowstate-tumbler-40-fl-oz
- MakerWorld (community): Car cupholder widening adapter — STL/3MF — varies per upload [verify license at link] — https://makerworld.com/models/94958
- MakerWorld (community): 32 oz water bottle adapter for vehicle cup holders — STL/3MF — varies per upload [verify license at link] — https://makerworld.com/models/785877

Xem Studio scan: not needed; this is a published standard. The sheet is the geometry.
API: https://xemstudio.com/api/geometry?object=car-cup-holder-sizes