The moisture content of fresh durian meat is 64.5%, and the freeze-drying technology can remove about 95% of the moisture, so the dry weight of freeze-dried durian = total weight-moisture removed by freeze-drying.

After calculation, 500g-500g x 64.5% x 95% = 500-306.375 =193.625g.

Therefore, a catty of fresh durian meat can make about193g dried durian; 1 kg dried durian needs about 2.6 kg fresh durian meat.