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Guitar Pedal Input Impedance

How do i calculate the "draw" (in mA) of my guitar pedal?

Hi I can't remember how to do it (been a while since school!). I know it uses a 9v DC power supply (either battery or mains adapter) and it's power consumption is 4.8W with an input impedance of 1MOhms and an output of 100 Ohms, but I don't know how to work out the draw.

Anyone able to help me?

Thanks!

Power = voltage x current

4.8 W = 9 x current

current = .53 A or 530 mA

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