Ohm's Law and Wire Gauge Calculator
Choose 2 Known Values
Volts
Ohms
Amps
Watts
0 AWG
1 AWG
2 AWG
4 AWG
6 AWG
8 AWG
10 AWG
12 AWG
14 AWG
16 AWG
18 AWG
20 AWG
22 AWG
24 AWG
26 AWG
28 AWG
30 AWG
31 AWG
32 AWG
33 AWG
34 AWG
35 AWG
36 AWG
37 AWG
38 AWG
39 AWG
40 AWG
Wire Size
Volts
Ohms
Amps
Watts
Feet Wire Length
Voltage Drop
Percent Drop
Choose 2 known values, example a 35 watt lightbulb @ 13.5 volts.
Enter in the TOTAL length of wire in the circuit and choose a wire size.
If the percent drop is ABOVE 3%, the wire is too small for the circuit.
Note 18 AWG is smaller wire than 12 AWG.
This calculator is supplied as a convenience and intended to be used for estimates only.
We make no warranties, implied or expressed, to the accuracy of any data or calculations presented here.
AWG
ohms/1000ft
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