How much does concrete weigh?
Normal-weight concrete weighs about 150 pounds per cubic foot, or roughly 4,050 pounds per cubic yard — just over two US tons. In metric terms that is about 2,400 kg per cubic meter. Steel reinforcement pushes the figure up slightly, and lightweight mixes made with expanded shale or clay aggregate come in much lower.
| Concrete type | lb per ft³ | lb per yd³ | kg per m³ |
|---|---|---|---|
| Normal (plain) concrete | 150 | 4,050 | about 2,400 |
| Reinforced concrete | 156 | 4,212 | about 2,500 |
| Lightweight structural concrete | 90–115 | 2,430–3,105 | about 1,440–1,840 |
Concrete weight formula
Work out the volume first — length × width × thickness for a slab, or π × radius² × depth for a round column — then multiply by the density of the mix. The calculator does both steps and converts the result to US tons, kilograms and metric tonnes.
Worked example: a 10 × 10 ft slab
At 4 inches thick, a 10 × 10 ft slab holds 33.33 cubic feet. At 150 lb/ft³ it weighs 5,000 lb (2.5 US tons). The same slab at 6 inches thick weighs 7,500 lb.
Concrete weight chart
Normal-weight concrete, before any waste allowance:
| Item | Volume | Weight |
|---|---|---|
| 1 cubic foot | 1 ft³ | 150 lb |
| 1 cubic yard | 27 ft³ | 4,050 lb (2.0 tons) |
| 10 × 10 ft slab, 4 in | 33.3 ft³ | 5,000 lb |
| 12 × 12 ft slab, 4 in | 48 ft³ | 7,200 lb |
| 20 × 20 ft slab, 4 in | 133.3 ft³ | 20,000 lb |
| 12 in round post hole, 4 ft deep | 3.14 ft³ | 471 lb |
| One 80 lb bag (mixed) | 0.60 ft³ | about 85 lb with water |
Why the weight matters
- Removal and disposal. Demolition contractors and dumpster companies price by weight. A 10-yard dumpster usually has a weight limit well below what 10 yards of broken concrete weighs.
- Hauling. One cubic yard is over two tons — more than the payload of most pickup trucks. Check your truck's rated payload before carrying bags or debris.
- Structural loads. Elevated slabs, decks and rooftop pads must be designed for their own weight. That calculation belongs to an engineer, but this tool gives you the starting figure.
Plan the whole job
Need the volume to order? Use the concrete calculator. Buying premix? The concrete bag calculator converts the volume to 40, 50, 60 or 80 lb bags, and the concrete cost calculator prices ready-mix against bags.
Frequently asked questions
How much does a yard of concrete weigh?
A cubic yard of normal concrete weighs about 4,050 pounds, which is just over two US tons (about 1.84 metric tonnes). Reinforced concrete is about 4,200 pounds per yard.
How much does a cubic foot of concrete weigh?
About 150 pounds for normal-weight concrete, 156 pounds for reinforced concrete and 90–115 pounds for lightweight concrete.
How much does a 10×10 concrete slab weigh?
At 4 inches thick, a 10 × 10 ft slab holds 33.3 cubic feet and weighs about 5,000 pounds. At 6 inches thick it weighs about 7,500 pounds.
Is wet concrete heavier than dry concrete?
Yes, slightly. Fresh concrete contains extra water that evaporates as it cures, so fresh concrete is a few percent heavier than the same volume once hardened.
How much does concrete weigh per square foot?
It depends on the thickness. A 4 inch slab weighs about 50 pounds per square foot, a 5 inch slab about 62.5 and a 6 inch slab about 75 pounds per square foot.