A regular 15 oz (425 g) can of pumpkin puree is approximately 1 ¾ cups—falling short of two full cups by 2 ½ tablespoons. If you prefer to make homemade pumpkin puree, you will have varying results on each try, since all pumpkins vary in size and water content. However, on average, a pumpkin weighing two pounds (1 kg) will usually grant around two cups of puree, the same as a can.