About The Wire Gauge Calculator

The Wire Gauge Calculator is designed to allow the electrical engineer or technician to determine the resistance of a wire given the gauge and length of the wire.

The power loss of the wire can be determined given the gauge, material, current and length of the wire.


Wire Loss Calculator: To determine the resistance of a wire, select the wire gauge (in awg) and the input the wire length including the desired Feet / Meters measurement units. Then input the current (in Amps) and press "Calculate". The total resistance, voltage drop, 10 Second Fuse Current and Ampacity at 60° of the wire will be listed. For more information, consult the Wikipedia.org American Wire Gauge page.

If you do not input a current you will still get the total resistance of the wire, but not the voltage drop.

Wire Gauge?: This where the real usefulness and power of the Wire Gauge Calculator is. It will allow you to determine the minimum wire gauge you will need for a given Wire Length, Current and Maximum Voltage Drop.

To determine the minimum wire gauge, input the Wire Length, Current and Maximum Voltage Drop and press "Calculate". The total wire resistance, the voltage drop and the minimum wire gauge will be listed.

Some Ohms Law Notes

The Wire Gauge Calculator is based on the simple ohms law equation P = I²R, commonly known as "I squared R". Since P = Power (watts), I = current (amperes) and R = resistance (ohms), it can be though of as power = current x current x resistance.

Want a simple memory trigger to help you remember P=I²R? Try "Twinkle, twinkle little star, power equals I squared R". Yes, we know it is lame but it works!

Note: What does "We are unable to determine a wire gauge with the values supplied. Please try different values." mean?

Should you get the above message after attempting an "Wire Gauge?" calculation, you likely have inputted values that are beyond the bounds of calculation. Try adjusting the values.

Special thanks: Spousal unit Francie, StackOverFlow.com, meetup.com group Explore iOS (iPhone/iPad).

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