If you are looking to calculate how much power your computer consumes, here is a simple Computer Power Calculator sheet using which you can find the power usage of computer and how much money it is costing you.

Most of the computer users are not aware about the power requirement and consumption by various components of computer so first lets go through the basic power usage of every part of computer.

Processor – In general home processors consume around 1.1 W to 1.7 W of power except Intel P4 socket 423, 478, 520, 530-570, and S478 extreme edition. These processors consume 58 W to 103 W.

Hard Disk - Parallel IDE, Serial ATA, or SCSI hard disk require around 25 W of power.

Memory Stick – Power chart of RAM is as follows…

SDRAM 100 – 7 W
SDRAM 133 – 12 W
DDR RAM – 10 W
DDR2 RAM – 7 W
DDR3 RAM – 30 W

Above power consumption is for a single stick RAM and you can multiply it by numbers of RAM stick you have.

Optical Drives – Each CD, DVD ROM and Write need around 20 W -30 W power and ZIP drive requires 10 W.

PCI Cards – Power consumption by different PCI cards are as follows.

PCI Modem and Network Card – 5 W
Sound cards – 7 W to 20 W
PCI SCSI Controller – 25 W
General PCI cards – 5 W- 10 W

USB Device – Each connected USB device requires 5 W

FireWire Cards – Around 8 W to 10 W

How to calculate Power usage of Computer

You can calculate a basic power consumption of your computer from the above list. This is of course for the inside of your CPU. It helps you to upgrade the SMPS whenever needed. For total computer power consumption, you need to add external devices like Monitor, Sound System, Printer etc. You will get power details about these external devices from the user guide.

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