Short answer: "thank you" in Italian is Grazie, or Grazie mille depending on the situation.
Grazie, the core translation
The default way to say "thank you" in Italian is Grazie. Pronounced roughly GRAHT-see-eh.
When Italian speakers actually use it
"Grazie mille" literally means "a thousand thanks".
Alternative: Grazie mille
Grazie mille is the other option Italian speakers reach for in this situation. It's not a synonym so much as a register shift, use the one that matches who you're talking to.
Practice this in a real Italian conversation
Reading a phrase and saying it out loud are two different skills. Skala's AI conversations let you drop "Grazie" into a real Italian exchange in your first 3-minute lesson, so it sticks the first time.
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FAQ
What's the most polite way to say "thank you" in Italian?
Both Grazie and Grazie mille are polite. Pick based on who you're talking to: register, not translation, is what natives are tuning into.
How do I pronounce Grazie?
Roughly GRAHT-see-eh. Recording yourself once and comparing to a native audio inside Skala closes the gap faster than reading pronunciation guides.