Power Consumption Calculation | Energy Consumption Calculator

Power Consumption Calculation | Energy Consumption Calculator

Energy Use Calculator

Use this free energy calculator for calculating electrical appliances energy usage.
Using below calculator you can easily find out the power consumption of electronic devices like Air conditioner,CRT Monitor,Clothes dryer,Clothes iron,Dishwasher,Electric kettle,Fan,Game Console,Heater,Microwave oven,Desktop computer,Laptop computer,Printer,Refrigerator,Space Heater,Stereo receiver,Television,Toaster oven,Vacuum cleaner,Washing machine,Water heater,Wi-Fi Router etc.
Choose device type from “Typical appliance” list,input the power use(wattage of device) and Number hours of use per day and click the calculate button.This finally gives us the number of kWh (kilowatt hours) per day,per month,per year for the selected device.
Electrical appliance:
Power Use:
Hours of use per day: h/day
Energy usage  kWh/day:
Energy usage kWh/month:
Energy usage kWh/year:




How do We calculate the consumption of an electrical appliance?

To find out the power consumption of an electrical appliance in kWh, You only need three numbers to get started.

  • The wattage of the electrical appliance in watt(you can say the capacity of the electrical appliance)
  • The number of hours you use that the appliance is in one day.
  • The number of days per year(for the yearly calculation) you use when the appliance is in turn on.

power consumption calculation formula

E(kWh/day) = P(in Watts) × t(number of usage hours per day) / 1000(W/kW)
OR

[the number of hours you use it in a day] x [the number of days uses] x ([wattage of the electrical appliance in watt] / 1,000) = number of kWh

If you want to calculate the monthly power consumption by your electrical device
then the number of days use=30
The Wattage should be divided by 1,000 because electricity measured in kWh so we need to convert
the watts-hour into the kilowatt-hour(watts to kilowatts).This formula finally gives you the number
of kWh.

Find out the energy consumption of a Refrigerator

Let’s take an example I want to calculate the power consumption of the Refrigerator at my house.The refrigerator is turn on all the time so that uses power continuously.
Number of hours per day              24 hrs
Number of days per year              365
The wattage of the Refrigerator  500 watts
Yearly power consumption of Refrigerator : 24 x 365 x (500 watts / 1,000) = 4380 kWh
Monthly power consumption of Refrigerator : 24 x 30 x (500 watts / 1,000) = 360 kWh

Find out the energy consumption of an Air Conditioner

Let’s take one more example we want to calculate the energy consumption of an Air Conditioner  Let’s say that Air Conditioner is used for 3 hours per day.
Number of hours per day               3 hrs
Number of days per year               365
The wattage of the Refrigerator   600
Yearly power consumption of Refrigerator : 3 x 365 x (600 watts / 1,000) =657 kWh
Monthly power consumption of Refrigerator : 3 x 30 x (600 watts / 1,000) = 54 kWh

Monthly Power Consumption of electrical devices in the kitchen

Type of appliance Power Watts Hours/Mo kWh/Mo
Dishwasher (With Electric Water Heating)
1500
30(1  hours per day)
45
Dishwasher (With Non-Electric Water Heating)
400
30(1  hours per day)
12
Coffee machine
500
7.5(15 Minute  per day)
3.75
Coffee Maker
900
7.5(15 Minute  per day)
6.75
Microwave oven
800
7.5(15 Minute  per day)
6
Conventional electric oven
2000
7.5 (15 Minute  per day)
15
Refrigerator
200
30 days
144

Monthly Power Consumption of electrical devices in the living room

Type of appliance Power Watts Hours/Mo kWh/Mo
LCD TV On 90 4  hours per day 9.6 kWh
LCD TV In sleep mode 3 720 2.16 kWh
old Plasma TV On 270 4  hours per day 266.4 kWh
old Plasma TV In sleep mode 3 720 2.16 kWh
LED TV On 30 4  hours per day 3.6 kWh
LED TV In sleep mode 0.3 W 720 0.216 kWh
Low-energy light bulbs 12 5  hours per day 1.8 kWh
Game console 90 3  hours per day 8.1 kWh
TVD/ADSL decoder 365 days – continuously 277 kWh + 112 kWh
= 389 kWh
Halogen lamps 300 5  hours per day 45 kWh

Monthly Power Consumption of electrical devices in the laundry room

Type of appliance Power Watts Hours/Mo kWh/Mo
Tumble dryer C 2500 90 hours(3 hours per day) 225 kWh
Washing machine A+++ 2500 90 hours(3 hours per day) 225 kWh
Washing machine B 2500 90 hours(3 hours per day) 225 kWh
Iron 2400 60 hours(2 hours per day) 144 kWh
Vacuum cleaner 1600 60 hours(2 hours per day) 96 kWh

Monthly Power Consumption of electrical devices at the office

Type of appliance Power Watts Hours/Mo kWh/Mo
Computer with flat screen On 80 90 hours(3  hours per day) 7.2 kWh
Computer with flat screen In sleep mode 3 W 30 days – continuously 2.16 kWh
Low-energy light bulbs 20 150 hours(5  hours per day) 3 kWh
Mobile phone charger 5 30 hours(1  hour per day) 0.15

Monthly consumption of electrical appliances in the bedroom

Type of appliance Power Watts Hours/Mo kWh/Mo
Computer with cathode monitor On 100 120 hour -(4  hour per day) 12 kWh
Computer with cathode monitor In sleep mode 40 30 days – continuously 28.8 kWh
TV with cathode ray tube On 100 120 hour (4  hour per day) 12 kWh
TV with cathode ray tube In sleep mode 8 30 days – continuously 5.76 kWh
Radio alarm 4 30 days – continuously 2.88 kWh

Monthly Power consumption of electrical devices in the bathroom

Type of appliance Power Watts Hours/Mo kWh/Mo
Electric shaver 10 7.5 hours (15 mins./day) 0.045 kWh
Back-up heating appliance 2000 7.5 days (15 mins./day) 9 kWh
Hairdryer 60 7.5 weeks (15 mins./day) 0.27 kWh

Important tips to save energy usage

  • The best way to save electricity is to avoid unnecessary use of the electrical device, switch off if you do not need it.
  • You can use CFL instead of a bulb, these CFL bulbs save 70 to 80 percent of electricity.
  • Keep the windows open during the day and so that sunlight can come to your bedroom.
  • Replace 2-watt LED bulb instead of the 15-watt bulb in the night.
  • Replace your Tv with LCD TV plasma. LCD TV consumes less electricity than T.V.
  • Use air conditioner (A.C.) on the ideal temperature at 24-degree centigrade.
  • when your device is not in use, set them to saving power mode, like set the computer, monitors, printers, in sleep mode when you are not using it. 
  • Replace 40-watt tube by 36 watts tube light.
  • Replace your cathode ray tube monitor by LCD(liquefied crystal display) monitor.
  • Replace desktop computers with Laptops, they use less power than desktop computers, and easy to carry.
  • Do not dry clothes in the washing machine and dry it in the sun light.
  • Use the ceiling fan more than the air conditioner.
  • Use the latest model of equipment such as tubes, freeze, washing machines, air conditioners, water pumps, geysers, fans etc.
  • If you planning to purchase a new model then please consider the star rating, the more stars,
  • the more power the savings will be.
  • Keep your air conditioner filter clean.
  • Set the temperature of the freeze to medium, avoid opening the freeze again and again, 
  • Do not keep warm things in the freeze. I have explained to you in easy Step

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Ashok Patel

I'm an electronic engineer working in a multinational company,having good experience on Electronics and electrical engineers design and oversee production of electronic equipment such as radios, televisions, computers, washing machines and telecommunication systems.I like to do RND and Research.I also have hands on experience graphic design software and in web designing having great command on ASP.NET, HTML5, JavaScript, T-SQL, JQuery.

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