Wire gauge chart is a table for wire diameters reference, often used in designing CNC machining parts, the development of standardized wire gauges helps the selection of right wires for particular purposes. Here is the introduction to American Wire Gauge and AWG chart data for reference and download.

What is American Wire Gauge?

American Wire Gauge (AWG), is a logarithmic stepped standardized wire gauge system used for the diameters of round, solid, nonferrous, electrically conducting wire, which also can be used to specify body piercing jewelry sizes, even for non-metallic materials. The larger gauge number indicates smaller wire diameters. The American Wire Gauge system is originated in the number of drawing operations when producing a certain gauge of wire, the finer wire needs more drawing. 


This gauge system originated in the number of drawing operations used to produce a given gauge of wire. Very fine wire (for example, 30 gauge) required more passes through the drawing dies than 0 gauge wire did. Manufacturers of wire formerly had proprietary wire gauge systems; the development of standardized wire gauges rationalized selection of wire for a particular purpose.

Wire Gauge Chart - AWG Chart

Wire gauge size chart is the AWG table, applicable for a single, solid and round conductor. The gauge of stranded wire is determined by the cross-sectional area of the equivalent solid conductor. You can use the American Wire Gauge Chart to convert standard AWG sizes to diameters in inches (in) and millimeters (mm), it also shows the resistance of various wire gauges and allowable current based on a copper conductor with plastic insulation.

Wire Gauge Chart Download

American Wire Gauge Chart PDF

Wire Gauge Calculation Formula

Wire diameter:

dn (in) = 0.005 in × 92(36-n)/39

dn (mm) = 0.127 mm × 92(36-n)/39


Wire cross-sectional area:

An (kcmil) = 1000×dn2 = 0.025 in2 × 92(36-n)/19.5

An (in2) = (π/4)×dn2 = 0.000019635 in2 × 92(36-n)/19.5

An (mm2) = (π/4)×dn2 = 0.012668 mm2 × 92(36-n)/19.5


Wire resistance:

R(Ω/kft) = 0.3048 × 109 × ρ(Ω·m) / (25.42 × An (in2))

R(Ω/km) = 109 × ρ(Ω·m) / An (mm2)