kWh Energy Savings Calculator

After making the various calculations for the Saving Computer Energy article, I realized that it would be helpful to have a tool that could easily calculate kWH (kilowatt hour) and cost values. I searched all over the internet and was not able to find a simple tool that really did what I needed. That’s why I made this kWh Energy Savings Calculator. It allows you to easily calculate the cost and kilowatt hour value of various common electronic devices or input your own values. Various inputs can be put into the calculator including:

  1. Normal Energy Use: The amount of watts that a particular device uses during normal use. This also includes how many hours and minutes the device is being used for.
  2. Standby Energy Use: The amount of watts that a particular device uses when plugged in, but not in use. This also includes how many hours and minutes the device is being used for.
  3. Cost: The cost per kWh of electricity.

In order to find how many watts a particular electronic devices uses, you can:

  • Select a Common Electronic Devices from the list below. It will fill in the normal energy use with average wattage and hours values for the device selected.
  • Check the device’s manual or online spec.
  • Do a search for the electronic model number along with the term watts. Various sites usually contain the wattage information for just about anything.
  • Contact the manufacturer if all else fails.

To find your energy cost, just look at you monthly electric bill or select your state for an average kwh cost.

Normal Daily Use
Common Electronic Devices

.240 kWh

Standby/Sleep Use
0 kWh

Cost of kWh Per State

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  1. Having one of those energy use meters would make your calculator very useful for any appliance we use. You can work out the consumption by measuring the difference between energy consumption when a device is switched on and when it’s switched off.

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  2. This is great. The whole ‘sleep/standy’ use is often overlooked. It it commonly called Phantom Power, and it uses quite a bit of energy.


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  3. Awesome tool! This will come in handy. Standby times is definitely forgotten about, but is still very important. It all adds up.

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  4. Very cool. I have an electrical use calculator on my site at , but it’s not nearly as nice and compact.

  5. I like the energy calculator makes it easy to figure out what you save. I like the fact it shows how much money you save makes it fun and motivates people.

  6. Nice calculator. We created a calculator for determining the cost savings of switching to LED Christmas lights from incandescent. You can find the calculator here:

  7. I need this calculator. I have to know how much energy I use every time. According to this, I will take an action to be more discipline whenever I have to.

  8. cool. make me easily calculate the cost and kwh value of various common electronic devices

  9. awesome energy savings calculator, actually, we have only computer and televisions on my house, but i will also need this to save energy.


  10. Fantastic tool! Very useful and easy to use. I can now see exactly how much my Mac is costing me to run!

  11. This is a great tool, but off topic… how do you create a calculator like that for a blog post?

    • Hannah
    • January 10th, 2010

    I think that besides that light bulbs it should have an option for compact flourescent light bulbs, the energy saving ones. Other than that, this website is crazy helpful, the info it gives is helping my friend and I with our science fair project. 1st place, here we come!

  12. Where’s the power factor in this calculation?
    KW’s would be fractionally smaller if the power factor was .9
    Some power factors can be as low as .65

    In either case, the KwH useage would be smaller than what this calculator is showing.


  13. Great tool for webmasters like me who now can calculate how much energy do we consume while we are working.

  14. this is an awesome way to know how much energy every single one of us is wasting for just usage of our daily machines and devices.we should all get together and stop energy wastage at all costs!!

  15. how many songs involve rapping about setting up retirement accounts

    • Charles Schmidtt
    • January 27th, 2011

    This calculator is nice and easy to use. Just what is needed in the age that we live. We all need to live leaner. Is the calculation for the computers acount for the monitor also?

    • Don
    • June 18th, 2011

    I recently replaced my 36-year-old HVAC system with a new high efficiency dual-fuel (16.5 SEER heat pump/95% natural gas heat) system. I have saved my energy usage figures from the last 2.5 years. Is there a calculation available that will show money saved when compensated for weather data (heating and cooling degree hours or degree days)? If you do, please respond to my email address. Thanks.

    Hoover, Alabama

    • crs
    • July 15th, 2011

    Why is Alabama not included in the choice of states?

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