{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "baseball",
 "name": "Baseball (MLB) size",
 "kind": "modern",
 "category": "Everyday objects",
 "group": "Sports balls",
 "year": null,
 "question": "What is the diameter of a baseball (mlb)?",
 "tags": [
  "ball",
  "sports",
  "baseball"
 ],
 "aliases": [
  "baseball (mlb) diameter",
  "baseball (mlb) size",
  "baseball (mlb) dimensions"
 ],
 "overall_mm": {
  "length": 74.8,
  "width": 74.8,
  "height": 74.8
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/baseball/",
 "sheet_txt": "https://xemstudio.com/objects/baseball/sheet.txt",
 "sheet": {
  "basis": "MLB Official Baseball Rules 3.01: 9–9¼ in circumference",
  "overall_mm": {
   "length": 74.8,
   "width": 74.8,
   "height": 74.8
  },
  "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)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "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"
    ]
   ]
  }
 },
 "sheet_text": "Baseball (MLB) size — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/baseball/  (CC BY 4.0)\nBasis: MLB Official Baseball Rules 3.01: 9–9¼ in circumference\nCatalog version: 2026-10-20\n\nOverall (mm): length 74.8, width 74.8, height 74.8\n- 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.\n- The file is a sphere at the maximum diameter (holders sized to it fit every legal ball).\n\ndimension  value\ndiameter  72.8–74.8 mm\nmass  141.7–148.8 g (5–5¼ oz)\nrule  MLB Official Baseball Rules 3.01: 9–9¼ in circumference\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- MLB: MLB Official Baseball Rules 3.01: 9–9¼ in circumference — web — Publisher's page; dimensions are facts — https://baseballrulesacademy.com/official-rule/mlb/3-01-the-ball/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/baseball/index.json\nAPI: https://xemstudio.com/api/geometry?object=baseball\n",
 "sources": [
  {
   "publisher": "MLB",
   "title": "MLB Official Baseball Rules 3.01: 9–9¼ in circumference",
   "url": "https://baseballrulesacademy.com/official-rule/mlb/3-01-the-ball/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tennis-ball",
  "pickleball",
  "softball-12-in",
  "softball-11-in",
  "table-tennis-ball",
  "lacrosse-ball",
  "golf-ball"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "How big is a baseball (mlb)?",
   "a": "Ø72.8–74.8 mm."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "baseball-max",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/baseball/baseball-max.step",
   "stl": "https://xemstudio.com/files/hardware/baseball/baseball-max.stl",
   "note": "Sphere Ø74.8 mm (maximum)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/baseball/index.md"
}