Is there any way to calculate camera focal length and sensor size from a single image? I know that there are some toolboxes that we can use to calibrate the camera.
As I know all of them need some specific types of images including checkerboards with different angles. 

But, I have some images and want to calculate camera parameters (e.g. focal length and sensor size) from those images. Any suggestion?
If anyone else is stuck : https://www.blendernation.com/2012/01/23/blam-geometry-camera-matching-add-on/ 

This add-on calculates the focal length from q couple of lines drawn on the image