Shunt Resistor Calculator (DC Current Measurement)

Calculate resistance (mΩ) and power dissipation (W) of a DC current shunt resistor. Enter nominal current and target voltage drop.

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Formulas used

  • Resistance: R = V / I
  • Power dissipation: P = V × I

Where:
V = voltage drop (Volt)
I = nominal current (Ampere)

Engineering considerations

  • Higher mV improves measurement resolution but increases power dissipation.
  • Always validate temperature rise under continuous current.
  • Use Kelvin (4-wire) sensing for accurate voltage measurement.
  • Define overload profile and duty cycle.

Typical voltage drops

  • 50 mV – low dissipation
  • 60 mV – industrial standard
  • 75 mV – common DIN value
  • 100 mV – higher signal margin

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