Wire Gauge Converter
Professional wire gauge conversion tool for electrical, construction, and automotive applications. Convert between AWG, SWG, diameter, and cross-sectional area with precision.
Enter a value to see conversion results
American Wire Gauge (AWG)
The standard wire gauge system used in North America. Lower numbers indicate thicker wires. AWG 12 is commonly used for household circuits, while AWG 14 is used for lighting circuits.
Standard Wire Gauge (SWG)
British standard wire gauge system. Similar to AWG but with different measurements. Commonly used in the UK and former British territories.
Diameter Measurements
Wire diameter can be measured in millimeters or inches. This is the actual physical diameter of the conductor, excluding insulation.
Cross-Sectional Area
Measured in circular mils or square millimeters. Critical for determining current carrying capacity and voltage drop calculations.
AWG Scale Logic
AWG numbers are inversely related to wire size. AWG 10 is thicker than AWG 12. Each step of 3 AWG doubles the cross-sectional area.
SWG Differences
SWG uses a different mathematical progression than AWG. SWG 10 is not equivalent to AWG 10 - always verify conversions for critical applications.
Metric Equivalents
European standards often use metric measurements (mm² for cross-sectional area). Common sizes include 1.5mm², 2.5mm², 4mm², and 6mm².
Temperature Considerations
Wire gauge affects current capacity, which varies with temperature. Higher temperatures reduce current carrying capacity.
AWG to Diameter
AWG 12 = 0.0808 inches
AWG 14 = 0.0641 inches
AWG 16 = 0.0508 inches
AWG 18 = 0.0403 inches
Metric Equivalents
AWG 12 = 2.05mm diameter
AWG 14 = 1.63mm diameter
AWG 16 = 1.29mm diameter
AWG 18 = 1.02mm diameter
Cross-Sectional Area
AWG 12 = 3.31mm²
AWG 14 = 2.08mm²
AWG 16 = 1.31mm²
AWG 18 = 0.82mm²
Residential Wiring
AWG 12 for 20A circuits, AWG 14 for 15A circuits
Industrial Power
AWG 4/0 to 500 MCM for high-current applications
Control Circuits
AWG 16-18 for low-voltage control systems
Building Wiring
NEC compliance for commercial and residential
HVAC Systems
Proper gauge selection for motor circuits
Security Systems
Low-voltage wiring for alarms and cameras
Power Circuits
Battery cables, alternator wiring, starter circuits
Lighting Systems
Headlights, taillights, interior lighting
Audio Systems
Speaker wire, amplifier power connections
Household Applications
Industrial Applications
Current Capacity (75°C)
Safety Guidelines
Never Exceed Capacity
Using undersized wire can cause overheating and fire
Consider Derating
High temperatures and bundled cables reduce capacity
Follow Local Codes
NEC, local electrical codes, and manufacturer specifications
Professional Installation
Consult licensed electricians for critical applications