{
 "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": "adafruit-metro-grand-central",
 "name": "Adafruit Metro (Uno form factor), Metro Mini and Grand Central (Mega form factor)",
 "kind": "modern",
 "category": "Electronics",
 "group": "Microcontroller boards",
 "year": null,
 "question": "Is the Adafruit Metro the same size as an Arduino Uno?",
 "tags": [
  "metro",
  "uno",
  "mega",
  "adafruit",
  "board"
 ],
 "aliases": [
  "adafruit metro dimensions",
  "metro m4",
  "metro mini",
  "grand central m4",
  "metro esp32-s2",
  "metro rp2350"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": true,
 "xem_status": "free-files",
 "les": false,
 "free_files": 6,
 "url": "https://xemstudio.com/objects/adafruit-metro-grand-central/",
 "sheet_txt": "https://xemstudio.com/objects/adafruit-metro-grand-central/sheet.txt",
 "sheet": {
  "basis": "Adafruit CAD (MIT); Metro follows the Arduino Uno outline and hole pattern, Grand Central the Mega outline",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Metro (328, M4, ESP32-S2, RP2350): 68.6 × 53.3 mm with the Uno's four holes (14.0/15.2 and 66.0 from the USB-end edge), USB at the left end, barrel jack beside it; shields fit.",
   "Grand Central M4: 101.5 × 53.3 mm, the Mega 2560 outline and holes. Metro Mini: 44.5 × 17.8 mm, breadboard-friendly, no holes.",
   "Metro boards use a micro-B or USB-C where the Uno has USB-B; the port position is the same, the cutout smaller."
  ],
  "table": {
   "columns": [
    "product",
    "bbox_l_mm",
    "bbox_w_mm",
    "bbox_h_mm"
   ],
   "rows": [
    [
     "3382 Metro M4",
     71.9,
     53.3,
     14.5
    ],
    [
     "2488 Adafruit Metro 328",
     71.1,
     53.3,
     12.1
    ],
    [
     "2590 Metro Mini",
     43.8,
     17.8,
     4.3
    ],
    [
     "4775 Metro ESP32-S2",
     71.9,
     54.6,
     16.9
    ],
    [
     "6003 Metro RP2350",
     71.8,
     54.3,
     14.5
    ],
    [
     "4064 Grand Central M4",
     104.9,
     53.4,
     14.5
    ]
   ]
  }
 },
 "sheet_text": "Adafruit Metro (Uno form factor), Metro Mini and Grand Central (Mega form factor) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/adafruit-metro-grand-central/  (CC BY 4.0)\nBasis: Adafruit CAD (MIT); Metro follows the Arduino Uno outline and hole pattern, Grand Central the Mega outline\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Metro (328, M4, ESP32-S2, RP2350): 68.6 × 53.3 mm with the Uno's four holes (14.0/15.2 and 66.0 from the USB-end edge), USB at the left end, barrel jack beside it; shields fit.\n- Grand Central M4: 101.5 × 53.3 mm, the Mega 2560 outline and holes. Metro Mini: 44.5 × 17.8 mm, breadboard-friendly, no holes.\n- Metro boards use a micro-B or USB-C where the Uno has USB-B; the port position is the same, the cutout smaller.\n\nproduct  bbox_l_mm  bbox_w_mm  bbox_h_mm\n3382 Metro M4  71.9  53.3  14.5\n2488 Adafruit Metro 328  71.1  53.3  12.1\n2590 Metro Mini  43.8  17.8  4.3\n4775 Metro ESP32-S2  71.9  54.6  16.9\n6003 Metro RP2350  71.8  54.3  14.5\n4064 Grand Central M4  104.9  53.4  14.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Adafruit (official): Adafruit_CAD_Parts: STEP, Fusion 360 and STL for Adafruit products — STEP, F3D, STL — MIT — https://github.com/adafruit/Adafruit_CAD_Parts\n\nFree files (MIT License (Adafruit_CAD_Parts), Adafruit Industries; STEP + STL, 6 parts): https://xemstudio.com/files/adafruit/adafruit-metro-grand-central/index.json\nAPI: https://xemstudio.com/api/geometry?object=adafruit-metro-grand-central\n",
 "sources": [
  {
   "publisher": "Adafruit (official)",
   "title": "Adafruit_CAD_Parts: STEP, Fusion 360 and STL for Adafruit products",
   "url": "https://github.com/adafruit/Adafruit_CAD_Parts",
   "formats": [
    "STEP",
    "F3D",
    "STL"
   ],
   "license": "MIT",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "arduino-uno-r3",
  "arduino-mega-2560",
  "adafruit-feather-boards",
  "threaded-standoffs-metric"
 ],
 "faq": [
  {
   "q": "Do Arduino Uno cases fit the Adafruit Metro?",
   "a": "Yes for the outline and mounting holes; the USB cutout differs (micro-B/USB-C on Metro vs USB-B on Uno), so the end panel needs a different opening."
  },
  {
   "q": "What are Grand Central M4 dimensions?",
   "a": "101.5 × 53.3 mm, the Arduino Mega outline and hole pattern, USB-C, microSD on the underside."
  }
 ],
 "files_license": {
  "name": "MIT License (Adafruit_CAD_Parts)",
  "holder": "Adafruit Industries",
  "url": "https://github.com/adafruit/Adafruit_CAD_Parts/blob/main/LICENSE",
  "note": "Direct links to Adafruit's own CAD repository on GitHub (MIT). Xem Studio computed the bounding boxes from the STEP files and hosts nothing. Adafruit does not endorse this site."
 },
 "offers": [
  {
   "file": "3382-metro-m4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "MIT License (Adafruit_CAD_Parts)",
   "step": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3382%20Metro%20M4/3382%20Metro%20M4.step",
   "stl": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/3382%20Metro%20M4/3382%20Metro%20M4.stl",
   "size_mb": 4.3,
   "note": "Adafruit #3382 Metro M4; bbox 71.9 × 53.3 × 14.5 mm; 4.3 MB on GitHub"
  },
  {
   "file": "2488-adafruit-metro-328",
   "formats": [
    "step"
   ],
   "price_usd": 0,
   "license": "MIT License (Adafruit_CAD_Parts)",
   "step": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2488%20Adafruit%20Metro%20328/2488%20Adafruit%20Metro%20328.step",
   "stl": null,
   "size_mb": 0.1,
   "note": "Adafruit #2488 Adafruit Metro 328; bbox 71.1 × 53.3 × 12.1 mm; 0.1 MB on GitHub"
  },
  {
   "file": "2590-metro-mini",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "MIT License (Adafruit_CAD_Parts)",
   "step": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2590%20Metro%20Mini/2590%20Metro%20Mini%20Rev%20B.step",
   "stl": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/2590%20Metro%20Mini/2590%20Metro%20Mini%20Rev%20B.stl",
   "size_mb": 2.5,
   "note": "Adafruit #2590 Metro Mini; bbox 43.8 × 17.8 × 4.3 mm; 2.5 MB on GitHub"
  },
  {
   "file": "4775-metro-esp32-s2",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "MIT License (Adafruit_CAD_Parts)",
   "step": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4775%20Metro%20ESP32-S2/4775%20Metro%20ESP32-S2.step",
   "stl": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4775%20Metro%20ESP32-S2/4775%20Metro%20ESP32-S2.stl",
   "size_mb": 3.6,
   "note": "Adafruit #4775 Metro ESP32-S2; bbox 71.9 × 54.6 × 16.9 mm; 3.6 MB on GitHub"
  },
  {
   "file": "6003-metro-rp2350",
   "formats": [
    "step"
   ],
   "price_usd": 0,
   "license": "MIT License (Adafruit_CAD_Parts)",
   "step": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/6003%20Metro%20RP2350/6003%20Metro%20RP2350.step",
   "stl": null,
   "size_mb": 6.1,
   "note": "Adafruit #6003 Metro RP2350; bbox 71.8 × 54.3 × 14.5 mm; 6.1 MB on GitHub"
  },
  {
   "file": "4064-grand-central-m4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "MIT License (Adafruit_CAD_Parts)",
   "step": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4064%20Grand%20Central%20M4/4064%20Grand%20Central%20M4.step",
   "stl": "https://raw.githubusercontent.com/adafruit/Adafruit_CAD_Parts/main/4064%20Grand%20Central%20M4/4064%20Grand%20Central%20M4.stl",
   "size_mb": 6.4,
   "note": "Adafruit #4064 Grand Central M4; bbox 104.9 × 53.4 × 14.5 mm; 6.4 MB on GitHub"
  }
 ],
 "markdown": "https://xemstudio.com/objects/adafruit-metro-grand-central/index.md"
}