由于Ga.进制和英寸不同，因此不存在转换公式，单位对照如下

　　Gauge (Ga.)标准钢材厚度（英寸）镀锌钢材厚度（英寸）铝材厚度（英寸）标准钢材厚度（mm）镀锌钢材厚度（mm）铝材厚度（mm）

　　30.23910.22946.073145.82676

　　40.22420.20435.694685.18922

　　50.20920.18195.313684.62026

　　60.19430.1624.935224.1148

　　70.17930.14434.554223.66522

　　80.16440.12854.175763.2639

　　90.14950.15320.11443.79733.891282.90576

　　100.13450.13820.10193.41633.510282.58826

　　110.11960.12330.09073.037843.131822.30378

　　120.10460.10840.08082.656842.753362.05232

　　130.08970.09340.0722.278382.372361.8288

　　140.07470.07850.06411.897381.99391.62814

　　150.06730.0710.05711.709421.80341.45034

　　160.05980.06350.05081.518921.61291.29032

　　170.05380.05750.04531.366521.46051.15062

　　180.04780.05160.04031.214121.310641.02362

　　190.04180.04560.03591.061721.158240.91186

　　200.03590.03960.0320.911861.005840.8128

　　210.03290.03660.02850.835660.929640.7239

　　220.02990.03360.02530.759460.853440.64262

　　230.02690.03060.02260.683260.777240.57404

　　240.02390.02760.02010.607060.70040.51054

　　250.02090.02470.01790.530860.627380.45466

　　260.01790.02170.01590.454660.551180.40386

　　270.01640.02020.01420.416560.513080.36068

　　280.01490.01870.01260.378460.474980.32004

　　290.01350.01720.01130.34290.436880.28702

　　300.0120.01570.010.30480.398780.254

　　310.01050.01420.00890.26670.360680.22606

　　320.00970.01340.0080.246380.340360.2032

　　330.0090.00710.22860.18034

　　340.00820.00630.208280.16002

　　350.00750.00560.19050.14224

　　360.00670.17018