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- #21
If you know the cost of your electricity in Kilowatt Hours the sums are easy to do:
My electricity is 9 pence (£0.09) per KwH.
The calculation is £0.09 divided by 1,000, multiplied by the wattage of the lamp/heater.
This gives the cost per hour.
So for a 250 watt lamp: £0.09/1000 x 250 = £0.0225 or 2.25 pence per hour.
Multiply by 24 for one day then by 7 for one week then by 52 for one year:
£0.0225 x 24 = £0.54 per day; £0.54 x 7 = £3.78 per week; £3.78 x 52 = £196.56 per year
My electricity is 9 pence (£0.09) per KwH.
The calculation is £0.09 divided by 1,000, multiplied by the wattage of the lamp/heater.
This gives the cost per hour.
So for a 250 watt lamp: £0.09/1000 x 250 = £0.0225 or 2.25 pence per hour.
Multiply by 24 for one day then by 7 for one week then by 52 for one year:
£0.0225 x 24 = £0.54 per day; £0.54 x 7 = £3.78 per week; £3.78 x 52 = £196.56 per year