Wire and Cable

Pick the right conductor for a circuit. These tools size wire by load and voltage drop, convert AWG and metric sizes, and look up gauge data and wire color codes.

Tools in this group

AWG to mm2 Converter: Convert AWG or kcmil to mm2, or mm2 to the nearest AWG, and see the next standard metric size up and down.
Battery Cable Size Chart Calculator: Enter battery voltage, current and cable length to get the fuse size and a cable gauge that meets the drop and is protected by that fuse.
Cable Size Calculator: Enter volts, amps and length in metres to get the minimum cable cross-section in mm2 and the next standard size.
DC Voltage Drop Calculator: Enter volts, amps and one-way length to see the drop, the watts lost in the wire and the wire size a 12, 24 or 48 V circuit needs.
Electrical Wire Color Code: Choose a country and system to see the wire colors for line, neutral and ground, including older colors.
Extension Cord Gauge Chart: Enter the cord length and the amps or watts of your tool to see the minimum gauge for a safe voltage drop.
Voltage Drop Calculator: Find the voltage drop for a wire size, the smallest wire for a target drop, or the longest run a wire can serve.
Wire Ampacity Calculator: Pick a conductor and see its allowable amps after the temperature column, ambient and conductor-count adjustments.
Wire Gauge Chart: Look up any AWG or kcmil size: diameter, cross-section, resistance at your temperature and weight per length.
Wire Size Calculator: Enter the load, voltage and run length to get the wire size that satisfies both ampacity and voltage drop.
Wire Size for 30 Amp Circuit: Find the wire gauge for a 30 amp breaker and see how far it can run before the voltage drop is too high.
Wire Size for 50 Amp Circuit: Find the copper or aluminum wire for a 50 amp breaker and check the voltage drop for your run length.
Wire Size for 60 Amp Circuit: Find the wire gauge for a 60 amp breaker and check the voltage drop for the length of your run.