Working out available power for phones

Hi,
Is there some sort of rule of thumb to follow when working out how many phones you will be able to power on a switch? e.g If I have a stack of  4 x 3750X how do you work out available power for phones? Does it make a difference if the switches run dual PSU etc.. and is there a drop in the available power if a switch loses it's main power and depends on STACK power etc..
Any further info would be appreciated.
Thanks

Hi Brandon,
It was more of how to work out how much power I'd have available before I bought the switches, e.g If I was to buy 5 x 3750x POE, how much POE would be available.
I know how to view the available power on currently owned switches. It was really just to try and work out what I'd have "IF" I purchase this and that. This would then steer me in the direction of what I should buy if I have for example 300 7940G phones for example and 7 APs.
Thanks

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