Ralph Molnar in 2004 determined a range of possible sizes for "Megalania". He did this by scaling up from dorsal vertebrae, after he determined a relationship between dorsal vertebrae length and total body length. If it had a long thin tail like the Lace monitor ("Varanus varius"), then it would have reached a length of . If its tail-to-body proportions were more similar to that of the Komodo dragon, then a length of around is more likely. Using 7 m as the maximum length, Molnar estimated the average weight of the lizard at , and as the maximum.