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Electrical Wire & Cable Size Calculator (Copper & Aluminum)

Wire & Cable Size Calculator (Copper & Aluminum)

Wire Cable Size Calculator-Copper-Aluminum-AWGToday, we are here with another comprehensive Copper and aluminum wire size calculator
As we have discussed in detail the topic of “How to calculate the proper wire size for Electrical Wiring. Now you can take the advantage of this calculator to do this job J
Calculating Wire/Cable Size formula for single Phase Circuits
Wire Circular mils =2 x ρ x I x L / (%Allowable Voltage drop of source voltage)  

Calculating Wire/Cable Size formula for Three Phase Circuits

Wire Circular mils =√3 x 2 x ρ x I x L / (%Allowable Voltage drop of source voltage)  
ρ = Specific resistance or resistivity of Conductor
D = Distance in Feet (One way) i.e. ½ the total circuit length
I = Load Current
Note: the Value of ρ = Specific resistance or resistivity of Conductor is used here for copper and aluminum is 11.2 and 17.4 respectively at 53° C (127° F)
  • Also check the “Good to know” Section after the calculator.
Enter value, And click on calculate. Result will show the required quantity.

You must know Input Values Result
Source Voltage (V): 110 120208
220 230240
277 440480
Number of Phases: Single-PhaseThree-Phase
Current in Amp (A):
One Way Distance (feet):
Allowable (VD) 3% of VS5% of VS
Or Select your (VD) V
Wire Size
Copper Aluminum
Good to Know:
If the wire size is greater than all gauges (i.e 0000 is largest one size of wire in), then electrical engineer measure it in CM, kCM or MCM instead of inches, because inch is a small unit of these kinds of  wires. Where;
A circular mil (CM) is a unit of circular area with a diameter of one mil (one thousandth of an inch). It corresponds to 5.067×10-4 mm².
1000 CM (circular mils) = 1 MCM or 1 kcmil = 0.5067 mm², so 2 kcmil.
It is a unit for referring to the area of a wire with a circular cross section.
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  1. Thanky Thanky for all this good inortmaoifn!

  2. above show how to calculate the size of the cable and wire bt it is theoretical right..bt practical not working when i input the data value single phase 230 current 5 A single phase 10 feet voltage drop take 2.5 v ..so please solve my problem

  3. That’s interesting

  4. i need electrical important q&answer

  5. Hello,

    Sir I need cables and wire calculations apps

  6. sir
    we want to feed 3phase supply to 70 ton air-conditioning load. what will be the size of cable(3 phase) require to feed the 70 ton A.C. load.

    • 35mm copper cable if lenth is less than 50 meter

      and if lenth is above than 50 meter the cable size is 50mm

      the standard voltage is 3 phase 400 volt 50HZ

  7. what is the copper cable sizing for a 8 kw single phase load 220 volt , 0.8 power factor and 3% voltage drop

  8. Nice information

  9. Sir i have lode 132 kw three phase witch size mm cable proper work

  10. Sir, I have plan to install 8.3 ton three phase a/c distance between a/c and panel is 45′ voltage drop is 3%. which is the correct size of copper wire i have to use.

  11. Hello,
    I need cables and wire calculations for aluminium and copper, table for diameters and Amp. Thanks.

  12. Show nice cable matches

  13. how to calculate below

    250 meter cable size and 105kw please solve the problem with formula

  14. Hi Everyone,
    Kindly give me guidance for the calculation of cable size.
    Suppose I have 40A load and 25KA is rating and I don’t have specified lentgh of cable,Voltage ratings but I need to give just size of cable for Phase conductor and ECC is there any way to calculate it directly using some direct formula…?

  15. rajender singh dahiya

    what is the distance between high tension electric wire to any building just like ware house, residential building, any factory. thanks

  16. How to calculate mechanical dimensions of Electric cable viz. Aerial bunched cables

  17. Know electrical

  18. What should be the cable size for the following conditions.
    1. amps: 3000
    2. 3 phase, 440 V
    3. Distance : 100 m
    3. Laid in trunking, copper cable

    Appreciate if you could suggest a cable size?

    Thank You

  19. nice information

  20. nice information

  21. a generator feeding 420 volt to 380/420 transformer cabble length is 1300 meter.load is of 200 kw.now how to find voltage drop and which cable suits alluminium or copper . and find the diameter of both. please help me out..

  22. Electric cable size wise how much load can be take. I need chart minimum 4 numbers of cable size i.e 1mm, 1.5mm, 2.5mm and 6mm

    Cable 1mm = ?? Amp or, ?? W


  23. What should be the cable size for the following conditions.
    1. amps: 250
    2. 3 phase, 440 V
    3. Distance : 100 m
    3. Laid in trunking, copper and Aluminumcable

    Appreciate if you could suggest a cable size?

    Thank You

  24. Sir, I have plan to install 4 no’s of 4 ton three phase a/c distance between a/c and panel is 45′ voltage drop is 3%. which is the correct size of copper wire i have to use.

  25. sir we have 3 kw hot plate it cable is burnout i want to replace it cable high tempatur fiber insulation type length 1mtr only plse helpe me

  26. Dear my supply has 230/380 voltage. But i dont find 380 voltage option in the cable size calculator….?

  27. Hi
    How would I determine the size of the main cable to feed 12 houses from a transformer to the main distribution box.
    Single phase
    45Amp per house x 12
    150 Meter (500Feet)
    Much appreciated

  28. Run is 300 ft. 120/240 volt system 170 amps 3% V.D.
    Using wire size 3/0 copper or 250MCM Aluminum.

    Is this the correct wire sizing for this project.

  29. Sir
    suggest XLPE alluminium Cable for 130A load distance is 500M

  30. Sir.cable & wire(aluminum or copper) how to selection. the load for example..10kw,50kw,125kw,25okw etc. i need to simple formula reply please.

  31. 70 kw 3 phase 415 voltwill 50 mm cable carry it

  32. Hi
    Kindly help me for selection of wire for my new industry.
    actually my all machine and acceries load is about 20 kw. in future i will add another 20 kw. machine wire from control board i know. but i don’t know from eb to main board and control board for 40kw. Above calculator is very useful for single phase. but i dont know how to enter voltage range for 3 phase. because each phase has 220v (L to N). i dont know exactly what i have to enter in 3phase..(415v or 220v). kindly help me. distance about 110feet.

  33. respected sir
    I want information how I m find cable rating or amp or electrical network. how to decide cable rating 70 ton air conditioning in amp..

  34. how to calculate copper cabale size, i have only currant and voltage

  35. Hi Dears,
    I have a new Air-conditioner is working on power 220V/60Hz and my country’s power is 220V/50Hz, my questions are how can fix it this air-condition on (220V/50Hz)? Is there an easy converter or electronic board/ diagram can I fix this issue by myself? If I run this air-condition on 50Hz what will happen ? is there any simple or shortest way for fix this problem.

    Please, nobody answer on my questions if he is not qualifying and professional in Electric because I have information but I need assistance from qualifying and professional people kindly?

    Thanks in Advance

  36. I like your work guys,

    But what is this AWG thing now? I am in South Africa and I need the conductor size in mm for each wire, please help.

  37. sir i want to know we have 200hp load so how much cable size should i use.

  38. If you may provide instant D.C. Cable size calculator if given: 12;24;48 Voltage D.C. and load current with cable length?

  39. Dear sir

    Can you Please send me the furmula of 3phase and single phase for calculation of cable.


  41. Md. Keafayet Ullah

    How can I use cable size for 3 Phase 440 kW load? Please suggest Me?

  42. Require to run a 3 phase / 50 Hz, 2 hp submersible pump
    at 1 km distance from the source of current supply.

    Appreciate advice re cable cross section, type, etc.

  43. I need to install 500hp ,700amp motor plz suggest me the proper size of abc cable

  44. Sir, i have to install a machine of about 250 Amps.. and the distance is about 100 meters… What should be the size of aluminum cable in mm2… Plz answer…

  45. Sir I can use cable for 7 DB box ? And 1DB box 60amp.
    Distance 10 metar

  46. pl give me all detels of all 4core amroud cable amp kw


  48. Sir,
    I want to know 350 kw star delta motor what type of cable size reqrequired copper or aluminium. With gland size both.
    D. China kumar
    Mega paper


    I want to know how to calculate for select cable size for 3phase and single phase?
    I want to know a formula

  50. 240mm2 armourd 4 core cable, What is the current carrying capacity between phase & nutral?

  51. we have 1600kva transformer and connected with 95mm2 xlp cable lenght 500mtr.Due to excess load we will replace this transformer with 2000kva.what will be the cable size with 500mtr lenght xlp cable.

  52. Thank you for providing this, I was really struggling with cable sizes and this has been an absolute life saver.

  53. I want to know the formula for calculating wire size & turns of each set.

  54. I want to know if the LRA 117 amp divide by 3 or mult by 3

  55. kw=2
    line to line=2.7a
    what size cu cable using?

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