SWG to mm Converter

The SWG (Square Wire Gauge) to mm Converter provides a precise, bidirectional method for converting between these two common electrical measurements. SWG is an older system often used in wiring diagrams and industrial settings, while millimeters (mm) are the standard metric unit for physical dimensions.

Our tool uses established international standards to calculate the equivalent cross-sectional area. Simply input the desired SWG value, and the converter instantly outputs the corresponding millimeter measurement, ensuring your wire size is accurately represented for modern electrical schematics or purchasing specifications.

This conversion is crucial because while a single number might seem simple, mixing gauge systems can lead to incorrect current carrying capacity assessments. For example, knowing that SWG 12 roughly corresponds to an area of 16 mm² helps you select the correct wire for a circuit breaker rated at 30A.

Before using the converter, always identify the required cross-sectional area (in mm²) based on your circuit's maximum expected current draw. This establishes your baseline requirement.

• Check local codes: Always verify conversion results against the electrical code specific to your geographical location.
• Factor in voltage drop: For circuits exceeding 30 meters, calculate potential voltage drop (V_drop = I * L * R) and ensure the resulting wire size accommodates this loss.
• Understand stranded vs. solid: The physical gauge might differ slightly between stranded (flexible) and solid conductors; always confirm which type your intended installation requires.

Using a professional converter like this one eliminates calculation errors, allowing you to focus on the electrical design aspects of your project.