Enter the cable run/length (m), the current (amps), and the voltage drop per ampere meter (V/amp-m) into the Voltage Rise Calculator. The calculator will evaluate the Voltage Rise. 

Voltage Rise Formula

The following formula is used to calculate the Voltage Rise. 

Vr = L*I*Vd / 1000


  • Vr is the Voltage Rise (volts)
  • L is the cable run/length (m) 
  • I is the current (amps) 
  • Vd is the voltage drop per ampere meter (V/amp-m) 

How to Calculate Voltage Rise?

The following steps outline how to calculate the Voltage Rise.

  1. First, determine the cable run/length (m).
  2. Next, determine the current (amps). 
  3. Next, determine the voltage drop per ampere meter (V/amp-m). 
  4. Next, gather the formula from above = Vr = L*I*Vd / 1000.
  5. Finally, calculate the Voltage Rise.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

cable run/length (m) = 100

current (amps) = 30

voltage drop per ampere meter (V/amp-m) = 250

Vr = L*I*Vd / 1000 =  ?