Busbar Current Calculator Online

Bus bar current Calculator:

Enter the breadth and thickness of the busbar; do not enter the length of the busbar. Then press the calculate button, you get the aluminium or copper busbar current carrying capacity in amps. You can choose the type of busbar, either aluminium or copper or galvanized bars or iron busbar or silver in the results.

Enter Busbar Width: mm
Enter Busbar Thickness: mm
Result – Copper Busbar Current: A
Result – Aluminium Busbar Current : A
Result – Iron Busbar Current : A
Result – GI Busbar Current : A
Result – Silver Busbar Current : A

More details about Bus bar: What is Busbar Current Carrying Capacity Calculation 5 Types of Busbar

Busbar current Calculator working:

As the stated thumb rule that the aluminium carries 0.8 times of the area, copper will be 1.2 times, silver will be 1.6 times, iron and GI will be 0.6 times.

Hence the formula for calculating current carrying capacity,

Learn More:   Hp to MVA Conversion Calculator


Copper busbar current carrying capacity = 1.2 * Busbar width in mm * Thickness in mm Amps


Aluminium busbar current carrying capacity = 0.8 * Busbar width in mm * Thickness in mm Amps

Iron Busbar

Iron busbar current Carrying capacity = 0.6 * Busbar width in mm * Thickness in mm Amps

GI Bus bar

Galvanized busbar current Carrying capacity = 0.6 * Busbar width in mm * Thickness in mm Amps

Silver Bus Bar

Silver busbar current Carrying capacity = 1.6 * Busbar width in mm * Thickness in mm Amps


Calculate the 150 x 25 mm busbar current carrying capacity in all the above materials,

  • Copper bar carries 4500Amps (1.2 x 150 x 25) current
  • Aluminium Carries 3000 Amps (0.8 x 150 x 25) Current
  • GI Bus Bar Carries 2250 Amps (0.6*150*25) Current
  • Iron Bus bar carries 2250 Amps
  • Silver bus bar carries 6000 Amps (1.6*150*25) Current.



  1. Hi

    Very useful information, but confusing one thing… It says that to calculate amps need to know only width and thickness (in my case copper strips). So, how about if I’m using trips 10 mm wide, 40 mm long and 2 mm tick? Length here absolutely doesn’t make any difference when comes to calculations?


  2. I am building a LiFePO4 battery with 280aH cell (8s configuration – 24V) and they sent me tinned clad busbar (copper inside) of 2mm thick and 20mm wide by 90 mm length ( I know length does not matter). I don’t think the busbars are sufficient to carry that current but these are the standard busbars they send to everyone?? Are these busbars going to be okay for connecting the cells together??
    Thanks! Ray

  3. Hi

    Are these results based on peak current capability or sustained current capability?

    Also do you have an example of how long peak would be measured using your calculations? (30s, 1m, 3m?)


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