<!--
{
  "availability" : [
    "macCatalyst: 14.0.0 -",
    "macOS: 11.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "ParavirtualizedGraphics",
  "identifier" : "/documentation/ParavirtualizedGraphics/PGDisplayDescriptor/sizeInMillimeters",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Paravirtualized Graphics"
    ],
    "preciseIdentifier" : "c:objc(cs)PGDisplayDescriptor(py)sizeInMillimeters"
  },
  "title" : "sizeInMillimeters"
}
-->

# sizeInMillimeters

The size in millimeters of the virtual display.

```
var sizeInMillimeters: NSSize { get set }
```

## Discussion

The device propagates the display size to the guest operating system. The app can scale the resulting screen data to a different size in its user interface.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)