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How to calculate electricity usage and charges

Posted By Raymond In Category: General

Feb
11
2006

For a very long time I’ve wanted to know how much is the charges if I use an electrical appliances such as my computer, air-conditioner, water heater and etc…
When I was very young, my mother used to tell me that air conditioner, water heater and iron consume a lot of electricity, and therefore, it’s expensive to use them. Even worst if you’ve forgotten to turn them off!

Every electrical appliance should have Watt (W).
This is the info that you need to calculate the usage of the electrical appliances that you use in hours.
Some doesn’t display Watt, but only Volt (V) and Ampere (A).
To get Watt, just multiple volt and ampere. Meaning, V x A = W or A x V = W. It’s the same.

In Malaysia, Tenaga Nasional Berhad(TNB) charges for home usage electricity is:
For the first 200 units per month: 0.218 cents
For the next 800 units per month: 0.258 cents
For each additional units per month: 0.278 cents

Formula to calculate electricity usage.


W x Hours / 1000 = kWh
Then first 200 kWh is used to multiply with 0.218, then the next 800 kWh multiply with 0.258.

Now you’ve got all the information that you need to calculate, let’s try calculating something.
If you use a Philips 14W bulb for 10 hours a day a month. How much is the charges?
Calculate electricity usage and charges

  • x = multiply
  • / = divide

    • 14W x 10Hours / 1000 = 0.14 kWh
    0.14kWh x 0.218(rate) = RM0.03052 per day
    For a whole month, just multiply RM0.03052 with 30 because a month consist of 30 days.
    RM0.03052 x 30 = RM0.9156

    No wonder the Philips 14W bulb is called the Energy Saver. You’ll only need to pay less than a dollar if you turn on the light for 10 hours a day.
    The calculation formula is the same thoughout the whole world, except for the Rates offered by their country’s electricy provider.

    Let’s try another calculation.
    You boil water everyday for one hour using Panasonic’s fast boiling with high power heater (2.4kW) kettle.
    How much is the charges for the whole month?
    Calculate electricity usage and charges
    2.4kW x 1hour = 2.4kWh
    2.4kWh x RM0.218 = RM0.5232
    For the whole month, RM0.5232 x 30 = RM15.696

    It’s quite expensive to boil water everyday for an hour. But since this is a fast boiling with high power heater, I don’t think you’ll need an hour to boil water. I just gave an example of boiling water an hour for easy understanding and calculation.

    Hope this information will help you determine to buy electrical appliances that don’t use so much energy.
    Save energy = save money :D


    Related posts:
  • Cheap Electricity
    • http://apadia.blogspot.com ted

      this is good :)

    • azman

      cool, my fridge didnt cool properly and suddenly the electricity bills went up by RM60 for the month, better check this out

    • http://raymond.cc Raymond

      azman, definately your electric charges will go up if your fridge didn’t cool propertly.
      Imagine your fridge have to work harder in order for your fridge to reach the cooler temperature that you set.

    • Kamarudin Omar

      How about for three phase calculation ?

    • bubblez

      you need to update the electricity tariff. first 200 units still costs the same. the next 800 units costs 28.9 cents/unit and more usage costs 31.2 cents/unit.

    • Dave

      I am also interested in 3 phase calculation as I changed from single phase to 3 phase & my bill went from RM150/month to RM521/month!

      Above poster is correct too – tariff has gone up for the higher amounts though I have 253 units @ 0.218 and 1013 units @ 0.289 before the last 694 units @ 0.312.

    • Prescy

      Raymond, what is the average consumption of 3-split type aircon if use for 8 hours here in singapore? How much for each aircon? We’re using a Daikin (inverter type). Thanks.

    • Merlin Magii

      Thanks Raymond – very informative.

    • abu

      hi..

      i think u forgo something in ur calculation regarding kwh usage.

      u need to know ur apliance power factro, due to it will give some impact on ur actual kwh at tnb meter.

      so dont forget that.

    • Jeffrey

      Dear Raymond,
      Can you tell me will it be more efficient if i use LED to replace Energy saving light.

      LED spec 12V, 20watt, 1.66amp
      Energy saving 240V, 14watt, 0.058amp

      I do not how to calculate when the volt is diffrent 12V vs 240V . Please advise
      Thank You

    • http://inmr@yahoogroups.com rr

      1. Tariff A – Domestic Tariff
      For Monthly Consumption Between 0-400 kWh/month
      For the first 200 kWh (1 – 200 kWh) per month sen/kWh 21.80
      For the next 200 kWh (201 -400 kWh) per month sen/kWh 34.50
      The minimum monthly charge is RM3.00

      For Monthly Consumption More Than 400 kWh/month
      For the first 500kWh (1-500kWh) per month sen/kWh 30.00
      For the next 100 kWh (501-600kWh) per month sen/kWh 39.00
      For the next 100 kWh (601-700kWh) per month sen/kWh 40.00
      For the next 100 kWh (701-800kWh) per month sen/kWh 41.00
      For the next 100 kWh (801-900kWh) per month sen/kWh 43.00
      For the next kWh (901 kWh onwards) per month sen/kWh 46.00
      The minimum monthly charge is RM3.00

    • Anne

      can anyone give me an idea how much electricity would a 2.oo kw electric fire use if it was on for 4 hours a day and the appx cost in real terms

    • Lumpis

      Hi Mr.Raymond,

      can you tell me what is suitable formula to calculate this item below.

      Item: Air-condition
      Brand: York
      Horsepower: 5hp
      Phase: 3 phase

    • http://imr rr

      answer for lumpis

      5hpx.746x.28senxhours usedx30days

    • loth

      Something wrong with the first 200 unit in my bill. Last month nobody was there, the only appliance consume electric was 1 wireless router which I doubt consumed 200 unit but still we got the first 200 charges and some more extra unit. WTF?

      Should it be the exact unit calculated (I got the N bill) or although we use less that 200 unit per month, TNB’s minimum charges is still 200 unit? I thought it’s rm3.00 minimum charge? WTF TNB, WTF..?

    • Has

      Dear Raymond,

      I was wondering on how do you calculate the,

      ‘For the first 200 units per month: 0.218 cents
      For the next 800 units per month: 0.258 cents
      For each additional units per month: 0.278 cents’ ?

      Is it given by the government or do we have to calculate it by ourselves?

    • mogan

      Hi Mr Raymond,

      I have some dificulities on calculations.

      i need to know how much my electricity charges for

      9units of 4 hp a/c , running 24 hrs for 30 days.

    • Stan Tan

      Hi Raymond,

      I intend to change my fixed subscription Sintel phone to a Star Hub free phone which plug into a internet broadband Modem, but this modem require electric, the information I got on the modem:
      +12VDC 0.75A, if this modem power on for 24 hrs/30 days, how to calculate the consumption in kWh?

    • Mary Zd

      Hi! Ju to say…thanks a lot…it was very useful…

      Keep up a good work…

      Cheers!

    • hismail

      on how to save electrical bill.Did any gadget in market now can be use
      example;

    • sree

      My question , How to select the MCB for control panel for example :- My control panel carry 1 Amp MCB . we have install 20 control module in one panel and each control module carry 10Va how to size up the MCB on this situation and what is the cal formula .

    • Sunny

      Thanks very useful information. :)

    • Danny

      how to apliance power factro in the calcuation. due to it will give some impact on ur actual kwh at tnb meter.

    • Buckingham

      If I have a transmission wheeling rate of $1.08/KW-Month, how do I covert that to $s/KWh?

    • Magen

      How to calculat tnb bills and what is the formula to do that?

    • http://WhichoneshouldIuse,Input/Outputvoltage/current? Ramprasad

      On the adapter I use for my equipment, it has both input,output voltage/current. Which one I should use for my power calculation?

    • sangeeth

      what does the unit ‘LS’ means?
      please give me a reply…

    • Gail Pieczyk

      I am urgently needing the charges for electricity usage per kWh for Ekurhuleni Gauteng region. I am being charged R1.94 per kWh, and my bill for 5 people is around R7400.00 per month. Is this Normal!!!!!

    • http://Mar Marlon asare buffuor

      What about usin de current/voltage given, to multiple by the days or hours,nd at the same time divide 1000, ist wrong formula?

    • Tang Chin Chye

      Dear Sir,
      Can I know how to calculate machine electricity usage per hour if I have below information:-

      Voltage :3 Phase (415V)
      Ampere : 38 Amp

    • M. Hasyim

      Saya mau tanya cara hitung biaya pemakaian listrik misal Daya saya 33.000 VA tanpa Kwh Meter, hanya berdasarkan Total besar Ampere yang ada pada NCB, Bagaimanakah carannya

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