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The kill-a-watt suggestion isn't ideal, as this will measure the power usage (in Watts) on the mains supply side of the laptop PSU. This will always read higher than the actual power usage of the laptop due to the inevitable inefficiencies in the power supply (typically 10-40%)
– tomfanning
Commented Jun 30, 2009 at 12:40
Also you'll be needing to use P=V*I (or more specifically I=P/V) to calculate the number of amps current the laptop PSU is drawing from the mains.
– tomfanning
Commented Jun 30, 2009 at 12:42

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