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How To Calculate Your Electricity Bill. Electric Bill Calculator with Examples

Calculate Your Electricity Bill in 1 Minute with a Simple Calculation or by Using an Electric Energy Bill Calculator

Calculating electricity bills and tariffs is straightforward for electrical engineering students and professionals. However, it can be confusing for non-technical individuals who are concerned about their electric charges from electricity service providers.

Below is a simple example and calculation for an electricity bill. By following this tutorial, you will be able to easily calculate your electricity bill. Additionally, we have included a very useful electrical energy and electricity bill calculator for easy calculation of electric power consumption.

How To Calculate Your Electricity Bill Simple Calculation.


Suppose a consumer uses a 1000-watt load per hour daily for one month. Calculate the total energy bill of the consumer if the per-unit rate is 9 (in $, £, €, INR, Rs, DHR, Riyal, etc.). [Assume 1 month = 30 days].


1 Unit = 1kWh.

So the Total kWh = 1000 Watts x 24 Hrs x 30 Days = 720000     …     Watts / hour.

We want to convert it into electric units, Where 1 Unit = 1kWh.

So the total consumed units by user: = 720000 / 1000     …     (k = kilo =1000).

Total Consumed Units = 720.

The cost of per unit electricity is 9.

Therefore, the total Cost of Electricity Bill = 720 units x 9 = 6480. (In $, £, €, ¥, INR “₹”, Rs, Peso, AED “Dirham”, SAR “Riyal” etc. or any other currency).

Note: If the unit cost of electricity is in cents, pence, or pennies, etc., simply divide the overall cost by 100 to get the amount in USD ($), Pounds (£), or any other currency, etc.

That’s it. You have Done :)

Electricity Bill Calculator

Select Country:
Typical Appliance:
Power Usage:
Hours of Use per Day: Hours / Day
1 Unit “kilowatt-hour (kWh)” Cost:
Energy Cost per Day:  
Energy Cost per Month:  
Energy Cost per Year:  

Electric Utility Bill Calculation

Calculation of Electric Energy Consumption

The following formula is used for electrical energy consumption.

E = P x t     …     (Wh)

E = P x t ÷ 1000     …     (kWh)

Consumed Energy = Energy Used in Watts x Time in Hours


  • E = Electrical Energy (Consumed in kWh)
  • P = Power in Watts
  • t = Time in hours per day

Wh (Watt-hour) is a small unit, so we divide the consumed energy on 1000 to get the value of energy in kWh instead of Wh.

Related Posts:


Consumed Energy = 2kW x 5 Hours = 10kWh

Calculation of Cost of Electricity and Bill Estimation

The following formula can be used as electric bill estimator per hour in dollars or other local currency.

Cost of electricity per hour = Consumed Energy in kWh x Cost of 1 Unit electricity

Cost Per Hour = kWh x Unit Price

E = P x t     …     (Wh)

E = P x t ÷ 1000     …     (kWh)

Energy Cost = Energy Used in kWh x Time in Hours


Cost Per Hour = 5kWh x .50 Cents per unit = $2.5

Good To Know:

A question has been raised about why we multiplied the total consumed watts by 24, even though the daily rate is already provided. It’s important to note that the given rate is not for daily rates but for the cost per unit of electricity, where 1 unit is equivalent to 1 kilowatt-hour (kWh), also known as 1 B.T.U (Board of Trade Unit).

Good to know: 1 Board of Trade Unit = 1 B.O.T Unit = 1kWh = 1000Wh = 36 x105 … Joule or Watt-seconds = 3.6 MJ 

For instance, if you switch on a 1000-watt bulb for 1 hour, it means you have consumed 1000 watts for an hour, i.e., 1000 watts for 1 hour = 1 kWh = 1 unit of energy. So, if the rate for one unit is $5, then you will have to pay $5 as the electric bill for your lighted bulb, which has consumed 1000 watts for one hour = 1 kWh = 1 unit of electricity.

Power Consumption of Typical Home Appliances in Watts

The following table shows the estimated value of wattage rating (in Watts) for different and common household devices, appliances and equipment.

Electrical Appliance Power Wattage in Watts “W”
Fan 80
LED Light Bulb 25
AC – Air Conditioner 900
Refrigerator 250
Electric Heater 2000
Water Heater 4000
Hair Dryer 1500
Clothes Dryer 3000
Clothes Iron 1400
Dishwasher 1300
Electric Kettle 1700
Toaster Oven 1100
Microwave Oven 1000
Desktop Computer 150
Laptop Computer 100
TV – Television 120
Stereo Receiver 300
Vacuum Cleaner 1200
Washing Machine 1500
Coffee Machine 1000
Blender 500
Water Pump 800
Sewing Machine 100
Thankless Water Heater 15000

Isn’t it easy to calculate your electricity bill? If you encounter any difficulties with your calculation or require additional information about your custom (home, residential, or commercial) electricity bill, please let us know in the comment box below. We will assist you accordingly.

Related Posts:

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      1. I want calculate electrical industrial unit of consumed if I connected 200/5. CT to ac 3phase 4 wire electronic kwh meterCT-2M

    1. Hellooo Vinod Sir how u Get that 7201000… 1000x24x30=720000 na… than how u get that 7201000 .. again nxt comment u said that 1000x24x30=720000 … i'm fully confused about u r comment please explain me…. Vindos sir and Electrical Technology

      1. Sir,we’re doing a project work of an electric vehicle. using 60v, 220Amph battery I need to find out how many units it is consuming and distance it was traveling is 100 kms per charge

      2. Dear sir,
        Im shyam from Telangana state, i would like to request you to share us how to calculate power bill from three phase energy meter and also for what parameters we need to consider for calculation

    2. Dear Karthik@<br />Vinod have corrected the above calculation…as 1000x24x30=720000…but mistakenly, we had written 7201000 instead of 720000. That&#39;s why you are confused.

        1. 2000w in conver to kw= 2000/1000=2kw
          So conver in hr. =2kwh
          Now u can say unit rate is 9 so
          Your ANS is 18 rupees

        1. Hi RD Soni Ji,

          1500watt in convert to kw= 1500/1000=1.5kw
          So convert in hr. =1.5kwh
          Now u can say unit rate is 9/- so
          Your ANS is 13.5 rupees


    1. hellow sir,<br />i am subbu….i am using commercial. i am using 1 laptop and 1 fan and 1 florescent lamp … 1 unit per cost 7 rupess..<br />how is to calculte per month<br /><br />

      1. I think according to the question it should be:
        1000w x 1hr ÷1000 = 1Kwh or a unit per day
        Or 30 Kwh or 30 units per month.

        # If load factor of 0.6 were given on above question, how would u approach to solution??

  1. good explanation but my doubt if my total consumption is 250 units then i am paying 250*4=1000 Rs. does it mean cost of 250kW is 1000Rs if my question is wrong then what is the total amount of the palnt spendng on me to supply 250 units in a month?

    1. Yes! If your consumed Units are 250 [250kWh] and your bill is Rs. 1000, then your are paying Rs. 4 per Unit Electricity.

        1. It depends on your service provider (different charges are applied in different countries and locations).
          In addition, the per unit charges are also mentioned in your electricity bill (In most cases).

  2. As per your statement &quot;A consumer consumes 1000 watts daily for one month&quot; so that equals to 1000W *30 =30000 W hence 30kwh, <br />If your statement was &quot;A consumer uses 1000W bulb (power consumption for electrical appliances is mostly stated in watt h) for 24hrs/ day for a month of 30days. then ur calculation 1000 x 24 x 30 = 720000 watts/hour is right.<br />

    1. Hello Rohit sir.. here in that Question we can lighted that bulb in only 1 hour na… then how u calculated that total hours(24 hrs) .. 1000x24x30.. in that Multiplication it not comes to 24hrs i think. bcoz we can lighted only 1 hour na…. please solve my Confusion … my problem is linked with other questions also… :( :(

      1. 1 MW = 1000 kilowatts…

        Therefore, a 1 MW power plant will produce 1000 Kilowatts per hour,.and we know 1 kWh is equal to 1 Unit.. so if there is 1000 watts appliance used electricity for 10 hours then it means 10 units of electricity used.. if 1 unit is of 5 rupees then we can find out the monthly cost as..

        1000 Watts*10 Hrs*30 Days= 300000 watts/hour.

        Where is 1 unit = 1 kWh.

        300000/1000 =300 Units

        Cost of per unit is 5.

        So total Cost or Electricity bill=5*300=1500

    2. Dear Karthik @<br />Check the Question as&quot;A consumer consumes 1000 watts load per hour daily for one month.Calculate The Total Energy bill&quot;<br />So 1000W/h daily = 1000W/h x 24….(As daily mean = 24 hrs in a day.)<br />That&#39;s why we have multiplied it with 24.

  3. i&#39;m fully confused… Why u multiply with 24 hrs (1000x24x30) … in that Question 1000 watts load per hour daily for one month.. it means we can loaded that bulb in 1 hour Only in total 30 days na… that bulb not loaded 24 hours only in one hour… then why u multiply that 24hrs.

    1. 1000Watt per hour Daily = 1000W/h x 24<br />Check the Question as&quot;A consumer consumes 1000 watts load per hour daily for one month.Calculate The Total Energy bill&quot;<br />So 1000W/h daily = 1000W/h x 24….(As daily mean = 24 hrs in a day.)<br />That&#39;s why we have multiplied it with 24.

    2. Ohhh okay Thank u ET…. in that question load per hour daily for one month,,, but i want i&#39;m consumes 1 hour only in whole day for One month then how much units we can consumed…

    3. If you mean 1000Watt only for One hour daily (take 1 month = 30 days)<br />the,<br />1000W x 1Hr x 30 Days = 30000WH = 30kWH = 30Units

    4. Oh Nice Thank u ET.. now totally gone Confuse.. thank u very Much.. if Diff Diff watt bulbs and Heaters are using in 3, 4 hours how to calculate… Hey in this site is thier any Electrical Calculator as per India, AP Units and Tariff.

    5. In case of Different load…. Add all those loads and usage per hour…then multiply with 30 , if you want to find the electric bill for 0ne month.

    6. Karthik Brother Simple Formula,

      1500 Watt 3 Hour Daily,

      You Use 135 Unit Per Month.

  4. Sir, Energy using in Telecom Towers with 3Phase s/m LT service. Each phase drawing 16A, 12A, 12A respectively. Load is static. How to calculate the avg.units per day/month/bimonthly. CT ratings 20A each phase. Trivector energy meter installed.

  5. 3Phase LT Connection with Trivector energy meter CT ratings 20A. Each Phase drawing 16A,12A &amp; 12A respectively. Static load

  6. Hello !<br /><br />I&#39;m Shubham<br /><br />tell me, how to calculate one bill between 3meters on the basis of Unit

  7. please solve this equation <br /><br />i have a 100w bulb operate 5 hours a day and 80w ceiling fan operate 10 hours a day. how to calculate a electric bill

  8. Please help me to calculate :<br />02 fans used avg. 16 hrs daily, means that total 32 hrs, 02 lights used daily 20hrs and 01 fridge ( 12cft ) 24hrs. <br />What will be the total units for a month?

  9. i have question – a household uses the following electrical appliances -<br />1.a fridge of rating 400W for 10hrs each day.<br />2. two fans of rating 80W each for 12hrs per day.<br />3. six electric bulbs of rating 18W each for 6hrs each day<br />so, calculate electricity bill of house hold for month of june , if cost per unit of electrical energy is Rs5.

  10. how do the sebs calculate for load in 3 phase – do they average out on each phase in meter.. for eg. R phase 3 amps , Y phase 5 amps and B phase 6 amps single phase load, then do they average on each phase of a 3 phase meter ?? and then calculate average power for 3 phase?? please clarify

  11. sir i m using 0.5hp single phase motor every day minimum 3hrs running and 6.39paisa/unit cost .what is the monthly consumtion of this pump .please send me calculation details

    1. 0.5*746=373w
      total units=0.373*3*30=33.57units
      ur mntly conusmption=214.5123

        1. @Anna… As you know that, there are 746Watts in 1hp….
          Therefore, To convert the 0.5hp into watts,,, That’s why they multiplied with 746Watts….

  12. hello sir, i have one ice cream machine, it consume 1.1 kw per hour, so what is a calculation of per day,and how much unit i used in 1 hour and what is a amount of it,
    please give me a suitable reply,

  13. How to calculate electricity cost for private educational institutions in Tamilnadu. As i refered in tangedco website, the following tariff details were given,
    for private educational institutions, Demand charge in Rs/KVA/Month – 350 , Energy charge in Paise per kwh – 635.
    While i checked with online calculator of tamilnadu electricity board,
    it is asking for contracted load, consumed units and kvah. contracted load is the load specified in the agreement between consumer and licensee. Why are they using kvah for calculating energy cost? By using kVAh and Kwh and contracted load, how they will calculate energy cost?

    Can u give me an example for calculating?

    If you could give me your ideas for this, it will be helpful for me.

    1. Dear, There are lots of way to charge the consumer for used electrical power. i.e. Two part tariff, Max demand Tariff , Three Part tariff, Power factor tariff and block rate tariff etc. But they charge for the exact kWh… So please tell me the total number of consumed unites and the price per unit. Thanks

      1. Dear sir, This is were I am confused. I downloaded the tariff details of Tamil Nadu from internet. For domestic consumers, it is given like, for first 100 units a particular rate and for next 100 units a particular rate and so on. But for other tariffs like private educational institutions, it is given as,

        Demand charge in Rs/KVA/Month – 350 , Energy charge in Paise per kwh – 635. (Rs.6.35 Per unit)

        And when i checked the online calculator of tangedco website, for the calculation of domestic consumers, it asks only the number of consumed units. If we enter the consumed units, it wil automatically calculate and give the output of the electricity bill.

        But for Private educational institutions, it asks for consumed units, Kvah and contracted load. So as per you asked, lets take the example of 10,000 units consumed and Per unit cost as mentioned above as Rs. 6.35.

        Please let me know why they given the information of demand charge , and contracted load. How to use that for calculating energy cost?

  14. if one thousand watt motor is ON for one hour, it will cnsume one unit.
    If 2kw motor is ON for one hour, it will cosume two units .
    2kw for 2 hr will cosum 4 unit.
    Units = power * time

  15. sir, i want to calculate units for street lights.. inwhich so many lamps are used.. like mercury , metal halide , cfl lamps and led also.. so how can i calculate units for such variable wattage

  16. i want to calculate my electricity consumption for my washer ,
    washer is three phase induction motor
    voltage across phases is 410 volts

  17. Respected Sir,
    This site is very useful for me . Sir i want to know that how many watts usually a fan , heater,refrigerator, T.V and a computer consumes????????????
    Reply me as soon as possible.

  18. Sir if i switch ‘ON’ 40watt energy saver for 1hr, so than what will be the total cost for 1hr. it would be 40watt according to formula or some thing else.

  19. According to the rate of electricity charge , minimum charge upto 20units is Rs 80 and the cost per units from 21 unit to 250 units is Rs 7.30.How much do 200 units cost?

  20. Power= 1500watt=1.5kw
    Time= 1 hr/day
    1kw*1hr=1unit of electricity
    If per unit charges are 13rupees, total cost will be 45*13=

    1. how to calcalte 3 phase bill
      how i divide total 3 phase bill in two port according to using of energy

  21. Hi,
    But how to know that the Electricity meter is working normal or abnormal as we are getting all made china meter.

    is their any logic instrument to instigate or investigate

  22. In the original example, why did we multiply by 24 although the consumer used one hour in a day? I think if the consumer is using one hour only in a day, we do not need to multiply by 24 to calculate monthly usage watts.

  23. A family living in central delhi has consume 250units of electricity in the month of may, find out its senctioned loads and calculate the electricity bill for same?

    Please answer this question asap..

  24. I am staying in rent but very months our owner is charging more for electric bill how its possible she’s not showing the bill also so plz tel me r mail me pre unit what is the charge and for 2 months we have used 172 units and I’ll send the meter sl no.38397456 plz check an update me as soon as possible……

  25. Even if you know how to calculate your electric bill with just a pen and paper, you can learn a whole lot more about your energy consumption with a technological upgrade. Companies like Neurio, Curb and Sense have designed products that can connect to your home s main electrical panel and recognize the unique electrical signatures of the appliances in your home. Each product works somewhat differently, but most allow you to view detailed breakdowns and analysis of energy usage using an app or web browser. This kind of information comes at a price, however — you should expect to pay a few hundred dollars for a system like this, and some require an electrician to install it at an additional cost.

  26. If we have consumed units of 100 in 3 phase meter and load is single phase , equally distributed on each phase then how many units consumed if we applied the same load on single phase meter


    நம்ம தலை எழுத்து சரியில்லை



  29. Hello, mine is phase-2 wire static energy meter which shows 001860 digits, therefore how much amount it will be to total?

  30. I have a question, suppose you light up a 120 watt bulb just for some hours that you are not certain about. But certainly not for a whole day. So in that case when calculating for total energy consumed, Do you still multiply the energy unit by 24 hours?
    If yes or no pls explain.
    Thanks in advance

  31. a total annual consumptions 720kwh, a maximum load 320kw, 0.85 p.f , if cost is 20birr per kVAR, plus 0.3birr per kwh .calculate the total cost
    help me

  32. how to calculate the bill when I am consuming 13.5 kWh/per day my company provider is Lesco Bill?

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