How much does it come to?
KWAHN-to VYEH-neh — four syllables total. 'viene' = comes/amounts to — very natural Italian idiom.
Use at a bar, kiosk, or casual restaurant when asking the total amount. 'Quanto viene?' is extremely natural and idiomatic Italian — more so than 'quanto costa il conto?'
'Viene' from 'venire' (to come) — used idiomatically to mean 'to amount to' in prices. This is one of the most natural Italian ways to ask for the total. You'll hear it constantly at bars and markets.
Quanto fa?
How much is it?
'Fa' from 'fare' (to make/do) — equally natural idiom for price.
Quanto è il totale?
What is the total?
More literal/formal way to ask.
Quant'è?
How much is it?
Shortened very informal version — common at bars.
At an Italian bar, payment is often handled at the cashier ('cassa') first — you pay, get a receipt, then bring it to the counter and order. This 'cassa prima' system is common in tourist bars in cities like Rome and Naples to prevent queue confusion.