The Cost of Electricity calculator computes the cost of consuming an amount of power over a period of time at a given utility cost.
INSTRUCTIONS: Choose units and enter the following:
- (P) Average Power usage
- (T) Time the power is being used (consumed)
- (UC) Unit Cost of power (Utility cost for a kiloWatt-hour)
Cost of Electricity (TC): The calculator returns the cost in U.S. dollars. However, this can be automatically converted to other currency units via the pull-down menu.
The Math / Science
The Cost of Electricity calculator uses the average power usage, duration of usage and cost per power unit to compute the cost of electricity. The formula for the Cost of Electricity is:
`TC = P * T * UC`
where:
- TC = Total Electric Cost
- P = Average Power Use for appliance (e.g. 60 watt light bulb)
- T = Time of consumption
- UC = Unit Cost of power
This calculator answers questions like the following:
- If I operate a 60 watt light bulb for 3 months, how much will it cost in electricity.
- How much does it cost to operate a sump pump (at 1,050 watts) for three days?
- How much does it cost to run an air conditioner (at 1,300 watts) for one month?
Note: The currency conversions in vCalc are updated every five minutes. Using this, you can enter the power rates in the local currency, and see what that costs in your currency (e.g. electricity costs X per kilowatt hour in Great Britain Pounds (GBP), but what does that power cost equate to in Japanese Yen.)
General Information
Utility cost vary by provider and location. Check your monthly power bill to see the rate that applies to you. A recent survey indicated that the average rate for a kiloWatt-hour in the United States was 11.88 cent per kWh (2012)
The Don Rowe website provides an estimated power (watts) level for different appliances, tools, pumps and air conditioners HERE.
The U.S. averages come from U.S. Energy Information Administration
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