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Voltage Drop Resistance Calculator

Calculate the maximum conductor resistance for an allowable voltage drop and current (R = VD ÷ I).

Formula

R = VD ÷ I

R
Maximum conductor resistance, in ohms
VD
Allowable voltage drop, in volts
I
Current, in amps

What this calculator does

Calculates the maximum conductor resistance a circuit can have without exceeding an allowable voltage drop.

Use cases

  • Find the resistance budget for a circuit run given a voltage drop limit
  • Check whether a conductor's resistance keeps voltage drop within range
  • Compare resistance budgets across circuits with different current and voltage drop limits

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