Concrete Weight Calculator: Pounds per Cubic Foot, Yard and Slab
Normal-weight concrete weighs about 145 lb per cubic foot, with a range of 140–155 (FHWA); this calculator uses 150 lb/ft³, which is 4,050 lb per cubic yard.
Advanced options: waste, prices
NRMCA advises ordering 4 to 10 percent over the estimate.
Concrete needed (with 10% extra)
1.96 yd³
1.50 m³ · 48 ft³ before extra
Slab: 12 ft × 12 ft × 4 in. Over about 1 yd³: order ready-mix.
Premix bags
- 80 lb88
- 60 lb118
- 50 lb141
- 40 lb176
- Ready-mix cost
- $313
- Weight
- 7,200 lb
Full breakdown
| Volume before extra | 1.78 yd³ · 1.36 m³ |
|---|---|
| With 10% extra | 1.96 yd³ |
| Weight (150 lb/ft³) | 7,200 lb · 3.60 tons |
| Pallets of 40 lb (80 bags each) | 3 |
| Pallets of 60 lb (56 bags each) | 3 |
| Pallets of 80 lb (42 bags each) | 3 |
| Truckloads at 12 yd³ | 1 |
| Truckloads at 8 yd³ | 1 |
Bag counts round up, as Quikrete's own calculator does. Cost uses your prices; delivery and short-load fees are extra.
Key takeaways
- Concrete weighs 140–155 lb/ft³, typically 145 (FHWA).
- This calculator uses 150 lb/ft³ = 4,050 lb per yd³.
- A 4 in slab weighs 50 lb per sq ft.
- Steel adds about 5 lb/ft³ (FHWA).
How Much Does Concrete Weigh?
Concrete weighs 140 to 155 lb per cubic foot, typically 145 lb/ft³, according to the FHWA. This calculator uses 150 lb/ft³ (2,403 kg/m³), which is this calculator's own rule inside that range.
Concrete Weight per Cubic Foot, Yard and Meter
| Volume | At 145 lb/ft³ (FHWA typical) | At 150 lb/ft³ (this calculator) |
|---|---|---|
| 1 ft³ | 145 lb | 150 lb |
| 1 yd³ | 3,915 lb | 4,050 lb |
| 1 m³ | 2,323 kg | 2,403 kg |
How Much Do 1, 3 and 5 Yards of Concrete Weigh?
One cubic yard of concrete weighs 4,050 lb, 3 yards weigh 12,150 lb and 5 yards weigh 20,250 lb at 150 lb/ft³.
| Cubic yards | Pounds | US tons |
|---|---|---|
| 1 yd³ | 4,050 | 2.03 |
| 3 yd³ | 12,150 | 6.08 |
| 5 yd³ | 20,250 | 10.13 |
| 10 yd³ | 40,500 | 20.25 |
How to Calculate Concrete Weight
Concrete weight equals volume × density.
- Find the volume in cubic feet with the calculator.
- Multiply by 150 lb/ft³ (or 145 for FHWA's typical value).
- Divide by 2,000 for US tons.
Concrete Weight per Square Foot by Thickness
| Slab thickness | Weight per sq ft |
|---|---|
| 4 in | 50 lb |
| 5 in | 62.5 lb |
| 6 in | 75 lb |
How Much Does a 6×2×2 ft Concrete Block Weigh?
A solid concrete block 6×2×2 ft holds 24 ft³ and weighs about 3,600 lb at 150 lb/ft³.
Reinforced and Bagged Concrete Weight
Reinforced concrete weighs about 5 lb/ft³ more for the steel, according to the FHWA. Bagged mix works out to about 133 lb per cubic foot of yield (80 lb ÷ 0.6 ft³), this calculator's own derived figure.
How Much Does a Concrete Slab Weigh?
| Slab | Weight (before extra) |
|---|---|
| 10×10 ft, 4 in | 5,000 lb |
| 12×12 ft, 4 in | 7,200 lb |
| 20×20 ft, 4 in | 20,000 lb |
| 24×24 ft, 6 in | 43,200 lb |
Worked Examples: Weight of Three Pours
10×10 ft slab at 4 in. 33.33 ft³ × 150 = 5,000 lb (2.5 tons).
12 in sonotube 4 ft deep. 3.14 ft³ × 150 = 471 lb.
Three steps 4 ft wide. 12.83 ft³ × 150 = 1,925 lb.
Concrete Weight in Kilograms
Concrete at 150 lb/ft³ weighs about 2,403 kg per cubic meter, or 2.4 tonnes per m³; at FHWA's 145 lb/ft³ it is about 2,323 kg/m³. One cubic foot weighs about 68 kg.
How Much Does Concrete Weigh per Gallon?
Concrete weighs about 20 lb per US gallon at 150 lb/ft³, because one cubic foot holds 7.48 gallons.
How Much Does 3 Yards of Concrete Weigh?
Three cubic yards weigh about 12,150 lb (6.1 US tons) at 150 lb/ft³, or 11,745 lb at FHWA's typical 145 lb/ft³.
Concrete Weight for Removal and Dumpsters
When breaking out old concrete, estimate weight the same way: a 10×10 ft slab 4 in thick weighs about 5,000 lb (2.5 tons) at 150 lb/ft³, which helps size a dumpster or truck.
Concrete Weight Calculator FAQ
What does 1 ft of concrete weigh?
One cubic foot of concrete weighs about 145 lb (FHWA typical) to 150 lb (this calculator).
How many 80 lb bags of concrete does it take to equal 1 yard?
45 bags of 80 lb concrete make one cubic yard.
How many 60 lb bags of concrete for 1 yard?
60 bags of 60 lb concrete make one cubic yard.
How long does 4 inches of concrete take to harden?
A 4 in slab can take foot traffic after about 24 hours and a car after about 7 days, and should be kept moist for 3 to 7 days (Concrete Network; NRMCA). See concrete cure time.
Next step
Check the volume first with the concrete calculator or cubic yards of concrete, then multiply by the density on this page.
Official sources
Last reviewed 2026-11-05. Numbers come from our tested engine; see how we calculate and our sources.