Concrete Weight Calculator
Concrete weighs about 150 lb per cubic foot, or 4,050 lb per cubic yard. Enter your slab, footing or column to get its weight.
How much does concrete weigh?
Normal-weight concrete weighs about 150 lb per cubic foot. Multiply your volume in cubic feet by 150 to get the weight in pounds.
| Volume | Weight |
|---|---|
| 1 cubic foot | 150 lb |
| 1 cubic yard (27 cu ft) | 4,050 lb, about 2 tons |
| 1 cubic meter | about 5,300 lb (2,400 kg) |
| One 80 lb bag, mixed (0.60 cu ft) | about 90 lb |
Weight of a concrete slab
For a slab, weight per square foot depends only on thickness.
| Thickness | Weight per square foot | 10 × 10 ft slab | 20 × 20 ft slab |
|---|---|---|---|
| 4 in | 50 lb | 5,000 lb | 20,000 lb |
| 5 in | 62.5 lb | 6,250 lb | 25,000 lb |
| 6 in | 75 lb | 7,500 lb | 30,000 lb |
| 8 in | 100 lb | 10,000 lb | 40,000 lb |
The formula
Weight (lb) = length × width × thickness × 150, with every measurement in feet. A 12 ft × 12 ft slab at 4 inches is 12 × 12 × 0.333 × 150 = 7,200 lb.
Why the number varies
- Mix: plain concrete is often taken as 145 lb per cubic foot and reinforced concrete as 150 lb. This calculator uses 150.
- Lightweight concrete: mixes made with lightweight aggregate run roughly 90 to 115 lb per cubic foot.
- Water: freshly placed concrete is slightly heavier than cured concrete because some mixing water evaporates.
If the weight matters for a deck, a truck bed or a lift, confirm the density with your supplier. For quantities, use the concrete yard calculator.
Frequently asked questions
How much does a yard of concrete weigh?
About 4,050 lb, or roughly 2 tons. That is 150 lb per cubic foot multiplied by the 27 cubic feet in a yard.
How much does concrete weigh per cubic foot?
Normal-weight concrete weighs about 150 lb per cubic foot. Plain concrete is often taken as 145 lb and reinforced concrete as 150 lb.
How much does a 4-inch concrete slab weigh per square foot?
About 50 lb per square foot. A 6-inch slab weighs about 75 lb per square foot.
How much does a 10×10 concrete slab weigh?
A 10 ft by 10 ft slab at 4 inches thick is 33.3 cubic feet and weighs about 5,000 lb.
How much does a cubic meter of concrete weigh?
About 2,400 kg, or roughly 5,300 lb.