The ideal glass thickness for a tabletop depends primarily on size, usage, and support structure. For standard dining tables (up to 48 inches), 3/8-inch (10mm) tempered glass provides adequate strength for everyday use. Larger tables (48-60 inches) require 1/2-inch (12mm) glass, while very large tables (over 60 inches) need 3/4-inch (19mm) glass to prevent flexing and ensure stability. Coffee tables and occasional tables can use 1/4-inch (6mm) to 3/8-inch (10mm) glass depending on size. Tables with full perimeter support require less thickness than those with corner or central support only. For safety and durability, always use tempered glass with polished edges. Consider beveled edges for aesthetic appeal and safety, particularly in households with children or high-traffic areas.