Electrical usage calculator?

[Trooper4985]

Is there an easy way to figure out how much juice you are using based on how many processors/fans/etc. you are running in a farm? I'm looking at a new house that is only a 100 amp service so I'm going to upgrade but I'd like to find a way to figure out how much juice I can burn each month and still be able to make the house payments.

 

[Frank4d]

I have never seen any calculators that are very accurate. If you're burning 300 watts with an 80% efficient PSU, the following is a close approximation:
300 watts / 115 volts / 0.8 efficiency = 3.26 amps

Also remember most houses are wired with 230 volt (115 volts each side of the neutral). If wired properly you would have 200 amps available.