What power supply would i need?

im relatively new to computer hardware and im wondering how i can calculate what power supply i will need?
the specs are as follows:

Intel Core i5-4430 Quad-Core Desktop Processor 3.0 GHz 6 MB Cache LGA 1150

MSI Computer Corp. Motherboard Micro ATX DDR3 1333 LGA 1150 Motherboards H87M-G43

Sapphire Radeon R9 280X 3GB GDDR5 DVI-I/DVI-D/HDMI/DP Dual-X OC Version

Corsair Vengeance 8GB (2x4GB) DDR3 1600 MHz

Western Digital Caviar Blue 500 GB SATA III 7200 RPM 16 MB Cache Bulk/OEM Desktop Hard Drive

Samsung Optical Drive SH-224DB/BEBE

please feel free to tell me if im missing anything essential to my first rig, this will be my first time building one
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More about power supply
  1. Best answer
    For a system using a single Radeon R9 280X graphics card AMD specifies a minimum of a 600 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 42 Amps or greater and have at least one 6-pin and one 8-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

    Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
  2. 550 would be a minimum.
    650W should be enough with some headroom.
    750W if you are planning to CX later on.

    Get some quality ones, 80 + bronze at least, brands from like XFX, Seasonic.
    See this link:

    It has PSUs in tiers based on quality.
    Take consider on +12V rail(s) amperage, as ko888 said.
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