Bregma-Lambda Distance in High Resolution Allen Brain Atlas: Mouse Brain

Hello, I have been using the Allen High Resolution Mouse Brain Atlas (High Resolution Image Viewer :: Allen Brain Atlas: Mouse Brain) to find coordinates for stereotaxic injections and want to know what the bregma-lamda distance is for this atlas? This will be useful to know so that I can scale the bregma coordinates to Lambda and/or scale across mice.

Many thanks,