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The actual thickness associated with a "gauge range" varies largely by industry. Gauges are OK for ball-parking, but are not adequate for engineering purposes. Producing mills… and reputable service centers work from actual measurements or minimum thicknesses.
Depends on what kind of steel: 18 Gauge Standard Steel is .0478 Inches. 18 Gauge Galvanized Steel is: 0.0516 inches thick. FYI 18 Gauge Aluminum is 0.0403 18 gage steel is… 0.0478 inches thick 18 gage steel is 0.0478 inches thick
14 gauge swg is 2.03 mm thick
.2031 inches5.16 mm
STANDARD STEEL .9119 MM. GALV.STEEL 1.0058
Oddly, 24 gage sheet metals may be of two thicknesses - depending upon whether they are "ferrous" (iron based, e.g. steel) or non-ferrous (all other metals). For ferrous… metals, 24 gage = .0239 inches thick. For non-ferrous, 24 gage = .0201 inches thick.
4.76 mm (USG)
0.1495 inches thick.
.0313 inches OR .794 mm
11 gauge steel is 0.125 inches thick.