1. Convert the dimensions of the sheet to inches:
   • Lengd: 4 fætur = 48 tommur
   • Breidd: 8 fætur = 96 tommur
2. Convert the thickness to decimal form:
   • 3/16 inch = 0.1875 tommur
3. Calculate the area of the sheet in square inches:
   • Area = Length x Width = 48 inches x 96 inches = 4,608 square inches
4. Calculate the volume of the sheet in cubic inches:
   • Volume = Area x Thickness = 4,608 square inches x 0.1875 inches = 864 cubic inches
5. Convert the volume from cubic inches to cubic feet:
   • Bindi (rúmfet) = Volume (cubic inches) / 1728 = 864 cubic inches / 1728 = 0.5 rúmfet
6. Determine the density of aluminum. The density of aluminum is typically around 0.098 pund á rúmtommu.
7. Multiply the volume in cubic feet by the density to calculate the weight in pounds:
   • Þyngd (lbs) = Volume (rúmfet) x Density = 0.5 rúmfet x 0.098 lbs/in³ ≈ 0.049 lbs

Þess vegna, a 4×8 3/16 álplötu would weigh approximately 0.049 punda.