Jewelry Wire Gauge Calculator
Convert an AWG wire gauge to its diameter in millimetres and inches and cross-sectional area, with typical jewellery uses for each gauge.
How it works
Diameter (mm) = 0.127 × 92^((36 − AWG) ÷ 39) · Area = π × (diameter ÷ 2)² · 1 in = 25.4 mm
American Wire Gauge is a logarithmic scale: every six gauges roughly halves the diameter, and a higher number means a thinner wire. The standard formula converts any gauge to millimetres exactly. For jewellery, gauge choice is a balance of strength and workability — thick wire holds shape for frames and clasps, while thin wire bends easily for wrapping and weaving but fatigues faster.
Worked example
20 AWG: 0.127 × 92^((36 − 20)/39) = 0.127 × 92^0.410 ≈ 0.812 mm, or 0.032 inches — the versatile all-rounder for wire-wrapping and headpins.
Frequently asked questions
Does higher gauge mean thicker or thinner?
Thinner. AWG counts down as wire gets thicker, so 28 gauge is fine and delicate while 12 gauge is heavy and stiff.
Is AWG the same as SWG?
No. British Standard Wire Gauge (SWG) uses slightly different diameters at the same number, so check which system your supplier quotes. This calculator uses AWG.
Does metal hardness change the gauge I need?
It changes workability, not the diameter. Dead-soft wire bends easily; half-hard holds shape better. For the same job, harder temper lets you use a slightly thinner gauge.
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This calculator is for educational purposes. Double-check important results before acting on them.