Concrete Weight Calculator

About 4,050 lb, or just over 2 US tons, for normal reinforced concrete at 150 lb per cubic foot. Plain concrete without rebar is closer to 3,915 lb per cubic yard.

A 10 × 10 ft slab at 4 inches is 33.3 cubic feet, so about 5,000 lb — around 2.5 tons. That figure matters most when you are hiring a dumpster, since most have a tonnage cap well below their volume.

Less per cubic yard than solid concrete, because broken pieces stack with air gaps between them. Around 130 lb per cubic foot is a reasonable planning figure for demolition debris, though it varies with how finely it is broken.

Three common reasons: sizing a dumpster or truck for demolition debris, checking that a floor or deck can carry a slab or topping, and working out lifting and transport for precast pieces.