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Data Input

Voltage?
Amperage (mA)?
Wire Length (Feet)
Percent Drop?

Wire Gauge Table

Wire Gauge
Metric
End Voltage
Max Length
Size Ok
22 Gauge
0.65mm/0.33mm2
20 Gauge
0.81mm/0.51mm2
18 Gauge
1.0mm/0.82mm2
16 Gauge
1.3mm/1.3mm2
14 Gauge
1.6mm/2.1mm2
12 Gauge
2.1mm/3.3mm2
10 Gauge
2.6mm/5.3mm2
8 Gauge
3.3mm/8.4mm2
6 Gauge
4.1mm/13.3mm2
4 Gauge
5.2mm/21.2mm2
2 Gauge
6.5mm/33.6mm2
1 Gauge
7.4mm/42.4mm2
0 Gauge (1/0)
8.3mm/53.4mm2
00 Gauge (2/0)
9.3mm/67.4mm2

As a general rule, the smaller the diameter of the wire, the higher the resistance and thus lower current capability over a given length. It is almost always acceptable to use a larger gauge wire. When in doubt about the load, go up a gauge. Other factors can affect the capacity of wires besides the length, such as a hot environment, duration of load, stranded vs. solid wire, wire plating, etc. Approximate metric wire size equivalents (with some rounding) are included in the table as diameter/area and are in millimeters/square millimeters [mm/mm2].

NOTES

To use the calculator, select the operating voltage, type in the maximum current in Amps of the circuit, and then enter the length of the wire. To see the results, press the “Calculate” button. If the wire gauge is okay to use, it will generate a check mark. The 'Max Length’ column indicates the maximum length of wire of that gauge that can be used at the given values entered.

Voltage drop 2% is suitable for most applications. 1% is better and 5% might cause flickering or poor performance in dimming systems.

This table is a general guide for MOST applications. By utilizing this Wire Calculator, you are doing so at YOUR OWN RISK. This calculator is a helpful guide, not an absolute authority. It is recommended to utilize a professional electrician or an engineering company to perform the calculations in your application.

Typical value applications:

Wattage
Voltage
Current
3w
9v
350mA
7w
9v
700mA
14w
18v
700mA
9w
36v
250mA
13w
36v
350mA
18w
36v
500mA
26w
36v
700mA
36w
36v
900mA
50w
36v
1400mA