Multiply the wattage (w) of the appliance by the number of hours of operation (hr), to get the watt hours (whr): w x hr = whr
If the appliance is on for less than an hour here are some quick conversions:
15 minutes = .25 hrs
30 minutes = .50 hrs
45 minutes = .75 hrs
Then divide the total by 1000 to get kilowatt hours or kWh: w X hrs = whrs/1000 = kWh
BELD’s rate is approximately 8.5 cents per kWh, so multiply the kWh total by $.085 to get the cost: kWh X $.085 = cost of running appliance
Finally, don’t forget to multiply your total by 30 to get a monthly total. Here’s the complete formula:
_______w X _______hrs =______whrs/1000 =______kWhr X .$085 = $______cost
And here are some examples:
Running one 100w light bulb for 10 hours
100w x 10 hrs = 1000whrs/1000 = 1 x .085 = $.085 or 8.5 cents.
Running a 750w space heater for 3 hours a day for a month
750w x 3 hours = 2250whrs/1000 = 2.25 x .085 = .10125 x 30 = $3.04
Using two 1500w hair dryers for 15 minutes a day
1500 x .25 375/1000 =.375 x .085 = .032 (per dryer/per day) x 30 =.96 x 2 = $1.92
You can use this formula for anything with a known wattage except things that cycle on and off, including refrigerator/freezers, air-conditioners, de-humidifiers, dryers, etc.
BELD’s seasonal office hours are 8 a.m.– 4 p.m. Monday through Friday. Our HelpDesk is available 24 hours a day, 7 days a week. 781.348.BELD (2353) More info
Braintree Electric wants to help you learn how you can conserve energy… and dollars! BELD’s new electricity usage portal displays the data gathered by your recently installed advanced meter. Learn more
Got energy questions? Contact our Energy Advisor Hotline at 781.348.1032. The Energy Advisor will spend the time necessary to explain in simple, understandable terms the information you're looking for. Learn more
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