A poured concrete wall with its wooden forms

Concrete weight calculator

A cubic yard of normal concrete weighs about 3,915 lb, nearly 2 tons, at 145 lb per cubic foot. A 10 × 10 ft slab 4 in thick weighs about 4,833 lb.

Shape

Length

Width

Thickness

Concrete

4,833 pounds

2.42 US tons

2,192 kilograms

All quantities and the working

Volume	33.33 cu ft (1.23 cu yd)
Metric tonnes	2.19
Per square foot	48.3 lb

How it was worked out

10 ft × 10 ft × 4 in = 33.33 cu ft

33.33 cu ft × 145 lb = 4,833 lb

How much concrete weighs

Missouri's Department of Transportation lists concrete at about 145 lb per cubic foot in its maintenance tables, which is 3,915 lb per cubic yard. QUIKRETE gives its bagged Concrete Mix, once mixed, as about 140 lb per cubic foot, or 3,780 lb per yard. Choose the one that matches your concrete; the steel in reinforced concrete adds a little more, which the rebar calculator weighs.

10 ft × 10 ft × 4 in = 33.33 cu ft

33.33 cu ft × 145 lb = 4,833 lb

Weight of a slab per square foot

Normal-weight concrete at 145 lb per cu ft
Thickness	Lb per sq ft	Lb per 100 sq ft	Tons per 100 sq ft
3.5 in	42	4,229	2.11
4 in	48	4,833	2.42
5 in	60	6,042	3.02
6 in	73	7,250	3.63
8 in	97	9,667	4.83
12 in	145	14,500	7.25

Weight of everyday pieces

At 145 lb per cu ft
Piece	Cu ft	Weight (lb)	US tons
80 lb bag of mix, mixed (0.60 cu ft)	0.6	87	0.04
1 cubic foot	1	145	0.07
A 12 in tube, 4 ft long	3.14	456	0.23
A 2 × 2 ft pad, 4 in thick	1.33	193	0.10
A 4 × 8 ft sidewalk panel, 4 in thick	10.67	1,547	0.77
1 cubic yard	27	3,915	1.96
A 10 yd truckload	270	39,150	19.58

Weight matters when you haul it or break it out. Concrete broken for removal takes up more room than it did in place, and EPA's conversion table lists loose scrap concrete at 1,855 lb per cubic yard of pile, so a yard of slab fills about two yards of dumpster.

Sources

Highway Maintenance Tables and Conversion Factors (Engineering Policy Guide appendix), Missouri Department of Transportation, current guide. Loose and compacted weights of crushed stone, sand, asphalt and concrete in pounds per cubic foot and per cubic yard.
QUIKRETE Concrete Mix (No. 1101) data sheet, The QUIKRETE Companies, revised October 2022. Bag yields: 40 lb 0.30 cu ft, 50 lb 0.375, 60 lb 0.45, 80 lb 0.60, 90 lb 0.675; about 140 lb per cubic foot; 2,500 psi at 7 days and 4,000 psi at 28 days; cure 5 days at 70 °F or warmer, 7 days at 50 to 70 °F; protect from freezing for the first 48 hours.
Standard Volume-to-Weight Conversion Factors, U.S. Environmental Protection Agency, March 2016. Loose weights of gravel, rock, sand, sandy loam soil and shredded wood chips.