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Introduction to Load Flow

This calculator is commonly used for load listing, load calculations and generator size selection.

Load Listing, Calculations and Generator Sizing Spreadsheet
Load Listing, Calculations and Generator Sizing Spreadsheet

Values used in calculations

Loading factor

Ratio between Absorbed Power and Rated Power

Load Factor
Motors between: 0kW – 15 kW0.7
Motors between: 15kW – 45 kW0.75
Motors between: 45kW – 150 kW0.83
Motors larger than 150 kW0.85


Percentage between Output Power and Input Power

Motors between: 0kW – 15 kW0.85
Motors between: 15kW – 45 kW0.89
Motors between: 45kW – 150 kW0.91
Motors larger than 150 kW0.94

Power Factor

Ratio between Active Power and Total Power

Power Factor
Motors between: 0kW – 15 kW0.75
Motors between: 15kW – 45 kW0.8
Motors between: 45kW – 150 kW0.82
Motors larger than 150 kW0.91


  • KW Consumed by a Motor = Absorbed Power x Efficiency x Power Factor
  • KVAR consumed by a Motor = KW x tan (cos-1(p.f))
  • KVA consumed by a motor = (KW2+ KVA2)1/2
  • Multiplication Factor for Continuous Load = 100%
  • Multiplication Factor for Intermittent Load = 50%
  • Multiplication Factor for Stand by Load = 10%
  • Max. Normal Operating Load = 100% of Continuous Load + 50% of Intermittent Load
  • Max. Peak Operating Load = 100% of Continuous Load + 50% of Intermittent Load + 10% of Standby Load or Biggest individual standby
  • Normal Operating Load with Growth Factor = 110% of Max. Normal Operating Load
  • Peak Operating Load with Growth Factor = 110% of Max. Peak Operating Load
  • Generator Size on 70% Load Factor = Peak Operating Load with Growth Factor / 70%
Software:Load Listing, Calculations and Generator Sizing Spreadsheet
Version:1.0 New
Developer:Shafqat Ali
Size:20.44 KB
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Load Listing, Calculations and Generator Sizing Spreadsheet
Load Listing, Calculations and Generator Sizing Spreadsheet

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More Information


  1. Youcef
    Feb 16, 2024

    I think also there’s an error on absorbed power, how can absorbed power be less than rated power !?

  2. Hemant Hon
    Aug 28, 2023

    How to download spreadsheet?

  3. VirnDmeso
    Jul 28, 2023


  4. Demeke Tsehay
    Apr 25, 2023

    Hi Thanks for making things easy by developing such spreadsheet.

  5. Pete Bux
    Aug 01, 2022

    Is the formula of the consumed power in the above list of calculations correct?
    It seems to me that the cos phi should be left out of it. It is also not taken into account in the Excel file for the calculations of the kW.

  6. Abderrahmane
    Jul 08, 2022

    nice article ,

    just im confused about the absorbed and consumed ,

    the total power consumed (KW) = absorbed (KW) (required to the pump) / motor eff factor

  7. Ramakant
    Jul 08, 2021

    Which standard (IS, IEC, NEMA) are used Load factor & power factor values? I have efficiency data as per IS 12615.

  8. Josh Presutti
    Feb 17, 2021

    The unprotect feature to save as unprotected file does not work if the copy you are creating is already protected. Is there any way to get the password so that the sheet can be expanded upon? It isnt changing the source calculations, formatting, etc. but you cant expand upon it in any way such as when you have 56 loads.

  9. William D. Smith
    Feb 24, 2020

    Seems like a lot of work to figure out loads of every appliance you want available. Obviously, one would not be using them all at once. I thought that the way to figure load was to take the total breaker amps times a reduction factor times voltage equals the generator wattage size required.

    If so, what is the typical reduction factor?

    Thanks, Bill

  10. Manirul
    Oct 05, 2018

    Effect of Starting sequence and nature of starting for Motor load have not shown in the spread sheet

  11. SHAHUL
    May 18, 2016

    i cannot edit the excel sheet, it is protected and asking password, please give me the password

    • HAMITI
      Sep 08, 2019

      Bonjour ,vous copie la feuille Excel dans une autre feuille Excel en suite renomme la feuille Excel

  12. kumaravel
    Aug 19, 2015

    i would like to receiver all articular related to electrical to my above specified E-mail ID

  13. Amin
    Dec 17, 2013

    hi,thanks for good software and articles.
    but some of these EXCEL Sheets are protected and we cant enter data for calculations please help me.
    Thanks again.

    • Benjamin Kaul
      Apr 01, 2019

      Create a copy…
      Go to,
      Sheet 1,
      Move or Copy,
      Tick Create a copy
      Click on drop down menu and select New Book
      …save an unprotected file…

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