How Much Does 8 Yards of Concrete Weigh?

8 yards of concrete weighs about 32,400 lb, which is 16.20 US tons or 14,696 kg, for normal concrete at 150 lb per cubic foot. That is 80% of a 10-yard ready-mix truck.

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Weight

32,400 lb

16.20 US tons, at 150 lb/ft³

What to buy

Bags of 80 lb mix one payload carriesPayload ÷ dry bag weight, rounded down. That is 1,440 lb of bags; the driver and other cargo count against the payload18 bags
Bags of 80 lb mix this slab would needAt about 0.30, 0.45 and 0.60 ft³ per 40, 60 and 80 lb bag (Quikrete data sheets)360 bags

In US tons: 16.20 tons
In kilograms: 14,696 kg
Weight per square foot: 150.0 lb/ft²
Volume: 216.00 ft³
Volume in cubic yards: 8.00 yd³

Bagged mix in a truck

Truck trips for those bags: 20 trips

Concrete weighs about 150 lb per cubic foot (4,050 lb per cubic yard), or 12.5 lb per square foot for every inch of thickness. Plain concrete with no steel is about 145 lb per cubic foot and reinforced concrete about 150 (FHWA Lightweight Concrete Bridge Design Primer, 2021, report FHWA-HIF-19-067). Lightweight concrete is much lighter, and the 115 and 160 lb per cubic foot choices are rough figures that are not from that source: ask your supplier for the real density of the mix. A 4 inch slab weighs about 50 lb per square foot. Check that a deck, roof or the ground can carry the weight.

Before you buy: round up to whole packs, check the size printed on the label, and add a little spare. Your supplier has the final say.

Blueprint

8.00 yd³ · 360 bags

8 yards of concrete by type

A cubic yard is 27 cubic feet, so 8 yards is 216 cubic feet. Multiply by the weight of a cubic foot of the concrete you are using.

Type of concrete	Density	Weight	US tons	Kilograms
Lightweight concrete, a rough figure	115 lb/ft³	24,840 lb	12.42	11,267
Plain concrete, no steel	145 lb/ft³	31,320 lb	15.66	14,207
Reinforced concrete, and the usual rule of thumb	150 lb/ft³	32,400 lb	16.20	14,696
Heavily reinforced, a rough figure	160 lb/ft³	34,560 lb	17.28	15,676

The slab 8 yards makes, and what it weighs per square foot

The total stays at 32,400 lb. A thinner slab spreads it over more ground.

Slab thickness	Area from 8 yards	Weight per sq ft	Total weight
3 in	864 sq ft	37.5 lb	32,400 lb
4 in	648 sq ft	50.0 lb	32,400 lb
5 in	518 sq ft	62.5 lb	32,400 lb
6 in	432 sq ft	75.0 lb	32,400 lb
8 in	324 sq ft	100.0 lb	32,400 lb

Eight yards: most of a truck

8 yards is 80% of a 10-yard truck and weighs 32,400 lb, 16.20 tons. That is 216 cubic feet, enough for 648 square feet at 4 inches or 432 square feet at 6 inches.

The largest slab in our size pages is smaller than this: a 24x24 slab at 4 inches takes 7.11 cubic yards and weighs 28,800 lb. Bagged, 8 yards would be 360 bags of 80 lb mix, so nobody mixes this by hand.

Worked example

8 × 27 = 216 cubic feet. 216 × 150 lb = 32,400 lb. 32,400 ÷ 2,000 = 16.20 US tons.

Nearby amounts

Concrete	Cubic feet	Weight	US tons	Truck loads
4 yards	108 ft³	16,200 lb	8.10	1
5 yards	135 ft³	20,250 lb	10.13	1
6 yards	162 ft³	24,300 lb	12.15	1
8 yards	216 ft³	32,400 lb	16.20	1
10 yards	270 ft³	40,500 lb	20.25	1
12 yards	324 ft³	48,600 lb	24.30	2
15 yards	405 ft³	60,750 lb	30.38	2

For a slab, wall or footing of your own size use the concrete weight calculator, and the concrete calculator for how many yards to order. The guide how much does concrete weigh has the weights per square foot. Hauling bagged mix yourself? See how many 80 lb bags a pickup can carry.

Want to change anything else? The calculator above is the full Concrete Weight Calculator: edit any number and the results update instantly.

Tools & materials for this project

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