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In order to calculate the energy cost of an electrical device, you must first
find out some general information about it. Most items, such as a motor, heater,
appliance or electronic components, will have a tag that indicates its wattage,
voltage, horsepower or amperage. Once you find this information, the rest is simple
mathematics. In order to calculate how much it costs you to run a specific item for
one hour, all you need to do is plug information into the formula below.
Cost per hour = watts x cost per kWh
1,000 Example: If the current cost per kWh were $0.09 per kWh, to calculate the
cost for a 6000-watt hot tub the formula would be:
It would cost 54 cents per hour to run the hot tub.
If wattage information for your electrical device is not shown,
it can be calculated with the following formula:
Example: A hot tub that runs on 230 volt power and draws 26 amps would
use 5,980 watts (230 x 26 = 5,980). Once you have figured the watts you
can calculate the cost per hour.
Motor capacities are sometimes specified using horsepower (h.p.). In this case,
you would calculate wattage by multiplying the horsepower by 746 (2 h.p. x 746
= 1,492 watts). You can now calculate the cost per hour.
Appliance Energy Usage Chart
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