how to calculate PC watt usage

im building my first PC in a few weeks and im just wondering hwhat power supply i should get (500w, 600w, 700w etc...)

these are my soon to be specs if your wondering:

Intel Core i5 3570K

CORSAIR CC650DW-1 Obsidian 650D

MSI Z77A-G45 motherboard

Samsung 840 Series 250GB

Corsair 16 GB Vengeance

Seagate 3TB 3.5 inch

EVGA GTX 760 Superclocked,

Corsair Builder Series CXM 750W Modular

Corsair H100i

there is a few other things like mouse, fans etc... but i didnt think it was worth adding
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