According to the LIBBY's Famous Pumpkin Pie FAQ:
One 15 oz. can equals 1 3/4 cups pumpkin puree; one 29 oz. can equals 3 ½ cups pumpkin puree.
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16 oz. pumpkin = 2 cups, according to http:/dan.drydog.com/pumpkin.html (scroll down to California Pumpkin Bread and it says 2 cups pumpkin (16 oz.))