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# automaticSkeletonScaleEstimationEnabled

A flag that determines whether ARKit estimates the height of a body that it’s tracking.

```
var automaticSkeletonScaleEstimationEnabled: Bool { get set }
```

## Discussion

When you assign this property a value of <doc://com.apple.documentation/documentation/Swift/true>, you instruct ARKit to compute a value for [`estimatedScaleFactor`](/documentation/ARKit/ARBodyAnchor/estimatedScaleFactor) for a person’s body anchor. ARKit must know the physical height of a person in the real world to accurately estimate the person’s real-world position. You enable this property to tell ARKit to estimate a recognized person’s physical height before it assigns the body anchor’s position.

---

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