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How do I calculate kWh?

1

1337h4x0r

Weaksauce
Joined
Aug 12, 2009
Messages
111
I'm trying to find out how much kW/h my gaming rig, monitor, and laptop is drawing. I recently bought a Kill-A-Watt P3 International device and I'm running it right now. 20 minutes in and it says under kWh "0.01". So should I wait an hour or two then check on the kWh again? How will I calculate it then?

According to our recent PG&E bill, they'll charge us between $0.14-$0.30 since we are on the Tier 3 scale. So do I multiply $0.30 to the kWh?
 
a kWh is one kilowatt drawn for one hour. So if your computer is drawing 500 watts, and you run it for 2 hours, you've used 1kWh. a 60 watt light bulb (0.06kw) would have to run for ~17hours to use 1kWh.

In your case, you've run for 20 minutes and used 0.1kWh. If you turned it off right now, you'd be charged $0.03 for that 20 minutes of power usage. If you left it on for the rest of the hour, you'd be charged $0.09 for 0.3kWh


When calculating cost, you just multiply the kWh by the price your utility company charges. So if you have a 500 watt computer running 24 hours would cost you 12kWh * $0.30 = $3,6 per day. After 30 days of running you will spend $108 to power your computer.
 
Ok its been 3 hours and 20 minutes and it now says "0.10 kWh". Correct me if I'm wrong, but that is not 1 kW correct? So using your calculations as an example, I would have to pay $0.30 for those 3 hours and 20 minutes its been on.
 
1337h4x0r said:
Ok its been 3 hours and 20 minutes and it now says "0.10 kWh". Correct me if I'm wrong, but that is not 1 kW correct? So using your calculations as an example, I would have to pay $0.30 for those 3 hours and 20 minutes its been on.
Click to expand...

Oops, you said 0.01kWh in your original post, but for some reason I saw 0.1kWh. My post should have said $0.003 (less than 1/3 of a cent) for that 20 minutes. 0.1kWh would be $0.03
 
IMHO, max your computer out at full gaming load (prime 95 and furmark, for example) with everything you'd normally have plugged in, plugged in. Measure the load in watts.

Convert this figure to Kw by multiplying it by 0.001.

For every hour you game on that computer, you are using that many kwh.

Eg.
500w full load = 0.5kw = 0.5kw/h per hour you're using the system.
Use the system for 2 hours and you're drawing 1 kw/h.

Multiply the kw/h figure by your hydro price per kw/h.

Eg. 500w full load = 0.5kw = 0.5kw/h x 0.13$ kw/h = 6.5c per hour.
 
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