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

# estimatedScaleFactor

A factor between the initial size and the estimated physical size.

## Declaration

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

## Discussion

Discussion The default value is 1.0, which means that a version of this image that ARKit recognizes in the physical environment exactly matches its reference image physicalSize. Otherwise, ARKit automatically corrects the image anchor’s transform when estimatedScaleFactor is a value other than 1.0. This adjustment in turn, corrects ARKit’s understanding of where the image anchor is located in the physical environment. See automaticImageScaleEstimationEnabled.