- 766 / 1200 = 63.8%
Of course, the numbers claimed by other NGOs / UN make it worse. But Israel's numbers are sufficient to make that claim.
[1] - https://edition.cnn.com/2023/12/05/middleeast/israel-hamas-m...
To some extent, you can't blame Hamas for these tactics. They would quickly lose a conventional war. At the same time, if you have zero chance of winning a military victory, perhaps you shouldn't use violence to pursue your political goals...
Civilian/combatant fatality ratios of 3/1 are not uncommon in urban warfare.
Even then, military necessity of killing combatants, not actively particpating in the war is not justified. Yes, you can kill those, who is shooting the rockets at Tel-Aviv, but bombing willy-nilly all of Gaza just because there might be tunnels, where potential combatants might be hiding,. is not acceptable, although not am not an international law lawer.