Does this apply to tempered glass?
Yes, tempering does not significantly change the density of the glass.
Total area: 0.50 m^2. Glass weight is roughly 2.5 kg per m^2 for every 1 mm of thickness.
At 12.50 kg, use suction cups and gloves.
Standard float glass density is used here. Lead glass would be heavier (~3.1 g/cm^3), while borosilicate is slightly lighter (~2.23 g/cm^3).
Weight = Volume x DensityVolumeArea x ThicknessDensity2.5 g/cm^3