How many cups in a 30lb bag of Holistic Select Large Breed/ 33lb bag of Innova Large Breed Adult dog food?

For those who have fed these two foods, about how many cups did you get out of each bag? I am weighing the pros and cons of both foods for my Great Danes and economy is one concern. I am aware that one can figure out an estimate mathematically, but I would rather get input based on experience (rather than try and guess at the food density, etc). Thank you