Electricity cost calculator
Power times time times price. The only trap is remembering that a kilowatt-hour is a thousand watts for one hour.
Cost per year
613.20
- Cost per day
- 1.6800
- Cost per month
- 51.14
- Cost per hour of use
- 0.4200
- Energy per day
- 6.0000 kWh
- Energy per year
- 2190.0 kWh
Show the working
- Power = 1500
- Hours per day = 4
- Price per kWh = 0.28
- Days per year in use = 365
- kw = 1500 / 1000 = 1.5
- Energy per day = 1.5 * 4 = 6
- Cost per day = 6 * 0.28 = 1.68
- Cost per month = 1.68 * 30.4375 = 51.135
- Energy per year = 6 * 365 = 2190
- Cost per year = 2190 * 0.28 = 613.2
- Cost per hour of use = 1.5 * 0.28 = 0.42
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- cost = power in kW x hours x price per kWh