# Baseball (MLB) size

> What is the diameter of a baseball (mlb)?

- Category: Everyday objects › Sports balls
- Kind: Modern device
- Basis: MLB Official Baseball Rules 3.01: 9–9¼ in circumference
- Page: https://xemstudio.com/objects/baseball/ · JSON: https://xemstudio.com/api/geometry?object=baseball · Plain text: https://xemstudio.com/objects/baseball/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/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 74.8 | 74.8 | 74.8 |

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

## Notes

- Baseball (MLB): Ø72.8–74.8 mm, 141.7–148.8 g (5–5¼ oz) (MLB Official Baseball Rules 3.01: 9–9¼ in circumference). Diameter = circumference ÷ π.
- The file is a sphere at the maximum diameter (holders sized to it fit every legal ball).

## Sizes

| dimension | value |
|---|---|
| diameter | 72.8–74.8 mm |
| mass | 141.7–148.8 g (5–5¼ oz) |
| rule | MLB Official Baseball Rules 3.01: 9–9¼ in circumference |

## Where the files are

- MLB: [MLB Official Baseball Rules 3.01: 9–9¼ in circumference](https://baseballrulesacademy.com/official-rule/mlb/3-01-the-ball/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/baseball/index.json

- baseball-max: [STEP](https://xemstudio.com/files/hardware/baseball/baseball-max.step) · [STL](https://xemstudio.com/files/hardware/baseball/baseball-max.stl) — Sphere Ø74.8 mm (maximum)

## Questions

**How big is a baseball (mlb)?**

Ø72.8–74.8 mm.

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