This helps calculate the orthographic camera size in the Unity3D

CameraSizeHandler

public class CameraSizeHandler : MonoBehaviour {

	//public Camera cam;

	// Use this for initialization
	void Start ()
	{

		Resolution res = Screen.currentResolution;
		Camera cam = this.gameObject.GetComponent<Camera>();
		cam.orthographicSize = (res.height * 0.5f) * 0.01f;
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}