Use this calculator when you want to choose which gauge wire to use for your small application (like radio controlled aircraft). This calculator will estimate the power lost in the wire and the weight of the wire (copper weight only). If you have any questions about cable or harness testing call us toll-free 1-800-441-9910.

   

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Step 1: Define the Load
The Load	Peak load current (I)(Amps) Max source voltage (Vs)(volts)
Step 2: Compare Different Wires
Wire Choice 1
	Length UnitsFeetInches Wire length from source to load		___ ohms
	Point B:  Length Gauge12131415161718192021222324252627282930	___ ohms
Contact resistance from fixture to DUT:
At Point A: ohms	___ ohms
At Point B: ohms	___ ohms
Your Device Under Test		Wire in DUT:
		Length Gauge12131415161718192021222324252627282930	___ ohms
Wire Resistance Results		Expected resistance of:
		A 2-wire measurement:	___ ohms
		A 4-wire measurement (points combine at A and B):	___ ohms
		4-wire measurement (points combine on DUT):	___ ohms
Step 3: Factor in the Variations
Variations		Wire Resistance % Wire Length %
		Max Temperature °	___%
		°F or °CFC Accuracy of Tester   Percent of reading %   Fixed error ohms
Recommended Thresholds
		Highest Expected Resistance for 2-wire:	___ ohms
		Highest Expected Resistance for 4-wire (points combine at A and B):	___ ohms
		Highest Expected Resistance for true 4-wire (points combine on DUT):	___ ohms