AWG Wire Size Calculator
The American Wire Gauge (AWG) system is a logarithmic standard used to denote wire thickness. Counter-intuitively, a higher number means a thinner wire.
This calculator converts AWG sizes into physical dimensions (Diameter and Cross-Sectional Area) and estimates electrical resistance for copper conductors. It includes a Scale Visualizer to help you gauge the physical thickness.
Select Size
InputPhysical Diameter
Electrical Specs (Copper)
Cross-Section Area
AnalysisFormulas
Diameter (mm)
dn = 0.127 × 92(36-n)/39
Where ‘n’ is the AWG number (e.g., 0000 = -3).Area (mm²)
An = (π/4) × dn2
Cross-sectional area of the conductor.Resistance
R ≈ (ρ × L) / A
Uses resistivity of Copper (ρ ≈ 1.68×10-8 Ωm).Rule of Thumb
+3 AWG ≈ 1/2 Area
Increasing gauge by 3 halves the cross-sectional area.How to Use
Select a size to see dimensions.
Select AWG Size
Use the dropdown to pick a standard AWG size. Sizes typically range from 4/0 (0000) (Thickest) to 40 (Thinnest).
Check Dimensions
Review the Diameter and Area. Use mm² for standard electrical load calculations.
Verify Capacity
Check the estimated Max Amps (Chassis Wiring) to ensure the wire can handle your current.