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Home » EE Questions / Answers » How To Calculate Your Electricity Bill. Easy & Simple Explanation.

How To Calculate Your Electricity Bill. Easy & Simple Explanation.

Calculate Your Electricity Bill in 1 min by Simple Calculation.

It is very easy to calculate the electricity bill and tariff for Electrical Engineering Students but, it makes confusion for non-technical people that concern about their electric charges from the electricity service providers.

Below is a simple example and calculation about electricity bill. If you pick this, You will be able to calculate your electricity bill very easily.How To Calculate Your Electricity Bill Simple Calculation.


Suppose, a consumer consumes 1000 watts load per hour daily for one month. Calculate The Total Energy bill of the consumer if per unit rate is 9 (In $, £, €, INR ,Rs, DHR, Riyal etc) [Take 1 month = 30 Days].


1unit = 1kWh.

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

we Want to convert it into Units, Where is 1unit = 1kWh.
So total Consumed units. 720000/1000…… (k=kilo=1000).
Total Units = 720.
Cost of per unit is 9.

So total Cost or Electricity bill= 720 x 9 = 6480. (In $, £, €, INR ,Rs, DHR, Riyal etc). You have Done 🙂

Good To Know:

A question is raised that why we multiplied it with 24 although the daily rate is given. Not that It is not Daily Rates, It’s the rate of Per Unit Where 1 unit = 1 kWh (Also Called 1 =B.T.U = Board of Trade Unit).

for instance, If you switched ON a 1000 watt bulb for 1 hour, It mean you consumed 1000 watts for an hour i.e. (1000 watts for 1 hour = 1kWh = 1 unit of Energy). So if the rate of unit is $5 , then you will pay 5 Dollars as a bill for your bulb which consumed 1kWh = 1 unit of electricity.

Isn’t it easy to calculate you electricity bill?… Let me know in the below comment box if you face any problem regard your electricity bill calculation or want to know more about your costume (home, residential or commercial electricity bill.

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  1. Vinod Chemmangattu

    7201000/1000= 7201. not 720. Please correct it.

  2. Vinod Chemmangattu

    1000x24x30= 720000. Not 7201000

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  4. 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?

    • Electrical Technology

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

      • Plz what is one unit charge in Jaipur

        • Electrical Technology

          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).

  5. Thanks for sharing this calculation on the <a href="http://www.torchenergy.com/s/average-electric-bill-for-apartment&quot; rel="nofollow">Average Electric Bill</a>. I was finding it difficult to understand how the bill is calculated, based on the consumption of electricity.

  6. Thanks for sharing this calculation on the <a href="http://www.torchenergy.com/s/average-electric-bill-for-apartment&quot; rel="nofollow">Average Electric Bill</a>. I was finding it difficult to understand how the bill is calculated, based on the consumption of electricity.

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  8. simpel formula is E=PT

  9. 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 />

    • Electrical Technology


    • 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… 🙁 🙁

      • Read the Q one more

      • 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

      • 1hp ka electricmotor 1hr chalega to kitna unit aaiga

    • Electrical Technology

      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.

  10. 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.

    • Electrical Technology

      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.

    • 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…

    • Electrical Technology

      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

    • 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.

    • Electrical Technology

      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.

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  12. if i have 100 watt bulb and it is usage 3 hr per day in a month how does it calculate

  13. 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.

  14. 3Phase LT Connection with Trivector energy meter CT ratings 20A. Each Phase drawing 16A,12A &amp; 12A respectively. Static load

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

  16. Hello !<br /><br />How to calculate one bill between 3 meters on the basis of unit

  17. 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

  18. 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?

  19. 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.

  20. I was confused about my electric consumption. This site helped me,thanks.

  21. 4.308 units<br />

  22. 4.088 units perday

  23. 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

  24. this site is very useful to me.thank you for your ans

  25. my bill is 1185/- units are 245 is it correct bill, how to caluclate please reply.

  26. how to caluclate the electricity bills? my bill amount is 1185/- unts are 245 is correct rate.

  27. 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

  28. I used to be able to find good info from your blog articles.

  29. if we on 70 hp mtor how much units its take

  30. 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,

  31. Sir i’ve got a laptop that I use 1hr daily for charging what’s the total unit sir

  32. It is very useful for everyone it helped me a lot

  33. unit calculation

  34. 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.

    • Electrical Technology

      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

      • 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?

  35. please calculate total bill in INR of 100unit, 200unit &500unit

  36. Dear sir,i used 100 kWh for 1 month and per unit i pay RS 4.so how much will the bill comes at the end of month?

  37. 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

  38. 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

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

  40. 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.

  41. what is d charges for 50 units

  42. 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.

  43. why we multiply 24hrs into kwh????

  44. 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?

  45. I have a cooler with 105 w mortor. How many unit in 24 hours ?

  46. Russell manzanero

    Make it more easier for me please??????

  47. Russell manzanero

    6480 what …………….. Kilo or watts????????

  48. Ct ratio 175/5 , one day unit 20, so please tell me par phase unit

  49. 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=

  50. I need to calculate for 6 kWh and 180 kWh

  51. 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

  52. 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.

  53. I got 1.72kw so how much rupees charged

  54. 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..

  55. kindly explain me the calculation of kw and kva in case of lag only tariff or lead as UPF tariff.

  56. Sir mujhe ye jankari chahiye ki 1unit bijali bill me kitana watt. lagta hai

  57. How could I calculate annual usage by using average monthly payment

  58. 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……

  59. 11KV and 33KV . how to calculate? How much?

  60. How to Calculate an average power of an induction furnace if we kW,Fce Volts,Freq,Kwh(M1+M2) readings?

  61. my bill is 920/- units are 139 is it correct bill, how to caluclate please reply.

  62. 34 unit ka kitna total electric bill kitna hoga

  63. A.o.A
    if the load show on three phase LT panel is 2300 Amp then how we find the units and kw?

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