AWG Wire Gauge Converter Calculator
Convert AWG wire gauge to diameter and cross-sectional area, or estimate the nearest AWG from measured diameter or area.
Input
Convert AWG wire size to conductor diameter and cross-sectional area, or estimate the nearest AWG size from a measured diameter or area.
Enter an AWG gauge and calculate conductor diameter and cross-sectional area.
Result
The calculation uses bare round solid conductor geometry. It does not account for insulation, stranding fill factor, plating, temperature, bundling, connector limits, or cable-rating standards.
Bridge AWG cable data and metric electronics design
AWG appears in cable, connector, harness, test-fixture, and North American documentation. PCB and electronics calculations usually need metric diameter, area, or resistance inputs, so converting the geometry cleanly avoids spreadsheet archaeology.
Gauge to geometry
Convert a selected AWG gauge into bare conductor diameter, area in mm², area in m², and circular mils.
Measured size to nearest AWG
Enter a measured diameter or area and find the nearest standard gauge, including the effect of an entered tolerance range.
First-pass conductor checks
Use the geometry as a starting point for voltage drop, harness documentation, current density, and connector checks.
Equations and worked example
The standard AWG relationship is logarithmic. Each three-gauge step approximately halves conductor cross-sectional area.
AWG 24 example
AWG 24 gives a bare conductor diameter of about 0.511 mm.
The circular area is about 404 circular mils.
The metric cross-sectional area is about 0.205 mm².
Reverse lookup example
A measured diameter near 0.51 mm maps closest to AWG 24.
A measured area near 0.205 mm² also maps closest to AWG 24.
If the input range crosses gauge midpoints, the reported nearest-gauge range can span multiple AWG sizes.
Common mistakes and limits
Confusing conductor and insulation diameter
AWG geometry refers to the conductor. Cable outside diameter depends on insulation, jacket, shielding, and construction.
Treating geometry as current rating
Current rating depends on insulation, temperature, bundling, installation, standards, connector contacts, and allowable voltage drop.
Ignoring stranded construction
Stranded wire has a different construction diameter from an equivalent solid conductor. Use the manufacturer data for final harness design.
Related calculators and next checks
Voltage drop calculator
Use wire area or measured resistance when checking cable and harness voltage drop.
Ohm's Law calculator
Check current, voltage, resistance, and power relationships around a wiring path.
Resistor power calculator
Use for dissipation checks once path resistance or load resistance is known.
Engineering conversion calculator
Convert supporting dimensions, prefixes, and mixed-unit values.
Engineering reference
Equations, assumptions, and design guidance
Converts American Wire Gauge values to bare round conductor diameter and area, or finds the nearest AWG from entered diameter or area.
Equations and variables
d(in) = 0.005 * 92^((36 - AWG) / 39)A = pi * (d / 2)^2cmil = d(mil)^2- AWG
- American Wire Gauge size (gauge)
- d
- Bare conductor diameter (mm, mil, inch)
- A
- Conductor cross-sectional area (mm², m², circular mils)
Assumptions and limitations
Assumptions
- The conductor is round and solid for the geometry calculation.
- Reverse lookup chooses the nearest standard AWG geometry by nominal diameter or area.
Limitations
- Insulation, stranding fill factor, plating, temperature, bundling, connector ratings, and cable standards are not included.
- Nearest AWG geometry is not a current rating or safety approval.
Worked example and design use
AWG 24 hook-up wire
Inputs: AWG = 24
Outputs: diameter is about 0.511 mm, area is about 0.205 mm², area is about 404 circular mils
Design guidance
- Use the geometry result as an input to voltage-drop, resistance, and harness documentation checks.
- For real cable selection, verify insulation temperature, installation method, connector rating, standards, and current derating separately.