Where does “quanto” come from?

quanto (Old Portuguese) comes from Latin quantus, from Proto-Italic *kʷijentos, from Proto-Indo-European *kʷíh₂onts.

quanto (Old Portuguese): how much

Definitions

Step	Language	Word	Meaning
1	Latin	quantus	how much, how many; how big
2	Proto-Italic	*kʷijentos	—
3	Proto-Indo-European	*kʷíh₂onts	—

quanto — Etymology, Origin & Word History | Etymology Explorer