---
title: estimatedScaleFactor
framework: arkit
role: symbol
role_heading: Instance Property
path: arkit/imageanchor/estimatedscalefactor
---

# estimatedScaleFactor

The estimated scale factor between the tracked image’s physical size and the reference image’s size.

## Declaration

```swift
var estimatedScaleFactor: Float { get }
```

## Discussion

Discussion The scale factor is between the tracked image’s size and the physicalSize property on the reference image you supply when you create an image tracking provider. For example, if you supply a reference image and the version that appears in front of someone is three times larger, this property is 3.0.

## See Also

### Getting image information

- [originFromAnchorTransform](arkit/imageanchor/originfromanchortransform.md)
- [referenceImage](arkit/imageanchor/referenceimage.md)
- [isTracked](arkit/imageanchor/istracked.md)
- [description](arkit/imageanchor/description.md)
- [id](arkit/imageanchor/id.md)