System voltage: volts

(equivalent to   Amp-hours for a   volt system)

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To calculate approximately how much electricity you use every day in watt-hours (Wh), enter the power of each appliance in watts and the average length of time it is on for each day, in hours. The first couple of lines are given as an example; just click in the boxes to replace the values with an estimate of your own power consumption. Clicking the button will add the total Watt-hours for the individual appliances together to give a daily total.

Power ratings can often be found on information plates on appliances, or instruction booklets. Note however that these are normally the maximum power draw - a radio may be rated at 50W for example, but only when it is blasting out at full volume. Fridges draw a lot of power, but usually the pump switches on every few minutes rather than runs continually. You may have to make a guess at the amount of time it is actually running for each day.