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They make chargers for netbooks that plug into 12v lighter sockets. It's likely to be less money than an inverter.
If you do want to calculate power requirements, you need to know how much power the charger (+ the inverter) draws, then use Ohm's law: P=IE
If you do want to calculate power requirements, you need to know how much power the charger (+ the inverter) draws, then use Ohm's law: P=IE