Well that depends on what manuscript is used, Goliath's stature as described in various ancient manuscripts varies: the oldest manuscripts—the Dead Sea Scrolls text of Samuel, the 1st century historian Josephus, and the 4th century Septuagint manuscripts—all give his height as "four cubits and a span" (6 feet 9 inches or 2.06 metres) whereas the Masoretic Text gives this as "six cubits and a span" (9 feet 9 inches or 2.97 metres. Either case he was just a very tall Palestine, nothing to do with the six fingers and six toes giant Nephilims.]
Knowing the history of Giants in the bible, and the physical proof we have of that, and the fact that God wanted Israel and David to know he won the battle with Goliath despite the impossible was because of God and not David, I am going with the 9 feet tall version. The six fingers just are the icing on the cake for me. The giants were often grotesque and disfigured creatures in one way or another.
The whole story is interesting, was there two Goliath's or just one was Elhanan David? I think there might have been one a tall Palestinian and one who was a descendent of the Giants verse 19
2 Sam 21
15Now when the Philistines were at war again with Israel. David went down and his servants with him; and as they fought against the Philistines, David became weary. 16Then Ishbi-benob, who was among the descendants of the giant, the weight of whose spear was three hundred shekels of bronze in weight, was girded with a new sword, and he intended to kill David. 17But Abishai the son of Zeruiah helped him, and struck the Philistine and killed him. Then the men of David swore to him, saying, “You shall not go out again with us to battle, so that you do not extinguish the lamp of Israel.”
18Now it came about after this that there was war again with the Philistines at Gob; then Sibbecai the Hushathite struck down Saph, who was among the descendants of the giant.
19There was war with the Philistines again at Gob, and Elhanan the son of Jaare-oregim the Bethlehemite killed Goliath the Gittite, the shaft of whose spear was like a weaver’s beam.
20There was war at Gath again, where there was a man of great stature who had six fingers on each hand and six toes on each foot, twenty-four in number; and he also had been born to the giant. 21When he defied Israel, Jonathan the son of Shimei, David’s brother, struck him down. 22These four were born to the giant in Gath, and they fell by the hand of David and by the hand of his servants.
