Adjust RectTransform Anchors for Unity UI

RectTransformTools.cs

using UnityEngine;
using UnityEditor;

public class RectTransformTools {

	[MenuItem("GameObject/Adjust RectTransform Anchors %l")]
	static void Adjust()
	{
		foreach(GameObject gameObject in Selection.gameObjects){
			adjustRectTransform(gameObject);
		}

	}

	static void adjustRectTransform(GameObject gameObject){
		RectTransform transform = gameObject.GetComponent<RectTransform>();
		if(transform == null || transform.parent == null){
			return;
		}
		
		Bounds parentBounds = RectTransformUtility.CalculateRelativeRectTransformBounds(transform.parent);
		
		Vector2 parentSize = new Vector2(parentBounds.size.x, parentBounds.size.y);
		// convert anchor ration in to pixel position
		Vector2 posMin = new Vector2(parentSize.x * transform.anchorMin.x, parentSize.y * transform.anchorMin.y);
		Vector2 posMax = new Vector2(parentSize.x * transform.anchorMax.x, parentSize.y * transform.anchorMax.y);
		
		// add offset
		posMin = posMin + transform.offsetMin;
		posMax = posMax + transform.offsetMax;
		
		// convert from pixel position to anchor ratio again
		posMin = new Vector2(posMin.x / parentBounds.size.x, posMin.y / parentBounds.size.y);
		posMax = new Vector2(posMax.x / parentBounds.size.x, posMax.y / parentBounds.size.y);
		
		transform.anchorMin = posMin;
		transform.anchorMax = posMax;
		
		transform.offsetMin = Vector2.zero;
		transform.offsetMax = Vector2.zero;
	}

}

Oh man thank you, you just saved my a** :)