How Thick Is 18 Gauge Sheet Metal - Gauge in mm lb/ft² kg/m²; 26 gauge, 24 gauge, 20 gauge, 18 gauge, 16 gauge, 14 gauge, 1/8 and 1/4. Web gauge 18 has a thickness of 0.0478 in or 1.214 mm and a weight per area of 1.950 lb/ft² or 9.521 kg/m². Web 38 rows thickness weight per area;
26 gauge, 24 gauge, 20 gauge, 18 gauge, 16 gauge, 14 gauge, 1/8 and 1/4. Gauge in mm lb/ft² kg/m²; Web 38 rows thickness weight per area; Web gauge 18 has a thickness of 0.0478 in or 1.214 mm and a weight per area of 1.950 lb/ft² or 9.521 kg/m².