# Car cup holder sizes: published ranges

> What size is a car cup holder?

- Category: Everyday mounts › Car interior
- Kind: Standard part
- 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
- Page: https://xemstudio.com/objects/car-cup-holder-sizes/ · JSON: https://xemstudio.com/api/geometry?object=car-cup-holder-sizes · Plain text: https://xemstudio.com/objects/car-cup-holder-sizes/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- 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.

## Sizes

| 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 |

## Where the files are

- Custom Accessories (listing by Ace Hardware): [Expandable jumbo cup holder: base expands 2.6–3.7 in to fit vehicle cup holders](https://www.acehardware.com/departments/automotive-rv-and-marine/automotive-accessories/interior-automotive-accessories/8108507) — web — reference (verify at link)
- 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](https://www.rei.com/product/220438/stanley-quencher-h20-flowstate-tumbler-40-fl-oz) — web — reference (verify at link)
- MakerWorld (community): [Car cupholder widening adapter](https://makerworld.com/models/94958) — STL/3MF — varies per upload (verify at link)
- MakerWorld (community): [32 oz water bottle adapter for vehicle cup holders](https://makerworld.com/models/785877) — STL/3MF — varies per upload (verify at link)

## How it fits

### Goes in or on
- [Stanley Quencher H2.0 tumbler, 40 oz](https://xemstudio.com/objects/stanley-quencher-40-oz/): a 75 mm base fits most holders

## Questions

**What diameter is a car cup holder?**

Not standardized. Inserts sold to fit most vehicles expand from about 66 to 94 mm (2.6–3.7 in); a 75 mm base fits most.

**How big is the base of a 40 oz Stanley?**

2.95 in (75 mm) at the base.

## Fits with

- [Stanley Quencher H2.0 tumbler, 40 oz](https://xemstudio.com/objects/stanley-quencher-40-oz/)
- [Car air vent slats: thickness range for vent clips](https://xemstudio.com/objects/car-air-vent-slats/)