Wire Size Calculator (AWG)
Determine the proper wire gauge (AWG) for your electrical circuit to prevent voltage drop and ensure safety.
Acceptable Voltage Drop: -
Required Circular Mils (CM): -
Recommended AWG Size: -
Use this wire size calculator, wire gauge calculator, wire ampacity calculator, electrical wire size, cable size calculator calculator for quick, clear estimates. Try a tiny example to see the impact of each input.
Q: How do I choose the right wire size?
Choosing the right wire size depends on several factors, including the amount of current (amperage) the wire needs to carry, the length of the wire run, the voltage drop acceptable for the application, and the insulation type and operating temperature. Using a wire size calculator or consulting the National Electrical Code (NEC) ampacity tables is crucial to prevent overheating and ensure safety.
What happens if you use too small a wire gauge?
If you use too small a wire gauge for an electrical circuit, several problems can occur. The wire will have higher electrical resistance, leading to excessive heat generation, which can melt insulation, cause fires, or damage connected equipment. It also results in a significant voltage drop, meaning less power reaches the appliance or device, potentially causing it to malfunction or operate inefficiently.
What is wire ampacity?
Wire ampacity is the maximum amount of electrical current, measured in amperes (amps), that a conductor can continuously carry without exceeding its temperature rating. It’s a critical factor in electrical design to ensure safe operation and prevent overheating of wires, and it depends on factors like wire gauge, insulation type, and ambient temperature.
Does wire length affect wire size?
Yes, wire length significantly affects the required wire size. Longer wire runs result in greater voltage drop and increased resistance, which means a larger (lower gauge number) wire is needed to carry the same amount of current over a longer distance while maintaining acceptable voltage levels and preventing excessive heat buildup. Calculating voltage drop is an important step in determining wire size for long runs.