Concrete weight
Concrete weight calculator
A cubic yard of normalweight concrete weighs about 3,780–4,050 lb (1.89–2.03 US short tons, 1,715–1,837 kg), because normalweight concrete is 140 to 150 lb per cubic foot and a yard is 27 cubic feet. Enter a slab size or a volume to see the weight of your pour, with the density source shown. Last updated October 12, 2026.
Concrete weight estimate
Weight = volume × density. Confirm the density of your actual mix with the supplier.
How much does your concrete weigh?
Enter a slab size or a volume, then choose a sourced density.
A range, because the density is a range.
WEIGHT IN OTHER UNITS
Weight depends on the mix, its aggregate and moisture. Fresh concrete can be heavier than the same concrete when it has dried to its in-service density. Use the supplier’s figure for lifting, hauling or structural decisions.
The formula
Weight = volume × density
Find the volume in cubic feet (length × width × thickness in feet), then multiply by the density in pounds per cubic foot. Divide cubic feet by 27 for cubic yards, and by 2,000 to turn pounds into US short tons. The result is a range because the density of normalweight concrete is published as a range, 140 to 150 lb/ft³.
For a mix with a different density, choose “Enter my own density” and use the figure from the supplier’s mix submittal. Need the volume first? Use the concrete slab calculator or the cubic feet to cubic yards converter.
Worked examples
Six weights, calculated step by step
- One cubic yard. 27 ft³ × 140 to 150 lb/ft³ = 3,780–4,050 lb, or 1.89–2.03 short tons.
- A 10 ft × 10 ft slab, 4 inches thick. 10 × 10 × (4 ÷ 12) = 33.33 ft³. Weight 4,667–5,000 lb (2.33–2.50 short tons).
- A 12 ft × 12 ft slab, 4 inches thick. 48 ft³ × 140 to 150 lb/ft³ = 6,720–7,200 lb (3.36–3.60 short tons).
- A 20 ft × 20 ft slab, 6 inches thick. 200 ft³ gives 28,000–30,000 lb, about 14–15 short tons.
- A metric slab, 3 m × 4 m × 10 cm. 1.2 m³ = 42.4 ft³. Weight 2,691–2,883 kg (2.69–2.88 tonnes).
- The 10 ft × 10 ft × 4 in slab in structural lightweight concrete. 33.33 ft³ × 90 to 115 lb/ft³ = 3,000–3,833 lb.
These are planning estimates from published density ranges. They are not a weighed load.
Weight by volume
- 0.5 yd³2,025 lb
- 1 yd³4,050 lb
- 2 yd³8,100 lb
- 3 yd³12,150 lb
- 5 yd³20,250 lb
- 10 yd³40,500 lb
| Volume | Pounds | US short tons | Kilograms |
|---|---|---|---|
| 0.5 yd³ | 1,890–2,025 | 0.95–1.01 | 857–919 |
| 1 yd³ | 3,780–4,050 | 1.89–2.03 | 1,715–1,837 |
| 2 yd³ | 7,560–8,100 | 3.78–4.05 | 3,429–3,674 |
| 3 yd³ | 11,340–12,150 | 5.67–6.08 | 5,144–5,511 |
| 5 yd³ | 18,900–20,250 | 9.45–10.13 | 8,573–9,185 |
| 10 yd³ | 37,800–40,500 | 18.90–20.25 | 17,146–18,370 |
Weight of common slab sizes
| Slab (ft) | Thickness (in) | Volume (yd³) | Pounds | US short tons |
|---|---|---|---|---|
| 10 × 10 | 4 | 1.235 | 4,667–5,000 | 2.33–2.50 |
| 10 × 10 | 6 | 1.852 | 7,000–7,500 | 3.50–3.75 |
| 12 × 12 | 4 | 1.778 | 6,720–7,200 | 3.36–3.60 |
| 12 × 12 | 6 | 2.667 | 10,080–10,800 | 5.04–5.40 |
| 12 × 16 | 4 | 2.370 | 8,960–9,600 | 4.48–4.80 |
| 12 × 16 | 6 | 3.556 | 13,440–14,400 | 6.72–7.20 |
| 20 × 20 | 4 | 4.938 | 18,667–20,000 | 9.33–10.00 |
| 20 × 20 | 6 | 7.407 | 28,000–30,000 | 14.00–15.00 |
Density values used and where they come from
| Concrete | lb/ft³ | Per yd³ (lb) | Source |
|---|---|---|---|
| Normalweight concrete | 140–150 | 3,780–4,050 | NRMCA CIP 36, Structural Lightweight Concrete |
| Normalweight, ACI reference | 150 | 4,050 | ACI Concrete Terminology (ACI CT) |
| QUIKRETE Concrete Mix 1101, typical | 140 | 3,780 | QUIKRETE Concrete Mix datasheet, product 1101 |
| Structural lightweight concrete | 90–115 | 2,430–3,105 | NRMCA CIP 36, Structural Lightweight Concrete |
A bagged mix tested by its maker is a useful check: QUIKRETE’s Concrete Mix lists approximately 140 lb/ft³, which is 3,780 lb per cubic yard and sits at the bottom of NRMCA’s normalweight range.
Why the number is a range
Concrete is made with different aggregates, proportions, air content and moisture, so its density varies. NRMCA’s CIP 36 gives 140 to 150 lb/ft³ for normalweight concrete and notes that structural lightweight concrete has an equilibrium density, an air-dry value, that is approximately 3 to 8 lb/ft³ below its fresh density. Field acceptance of fresh density follows ASTM C138, with a typical tolerance of ±3 lb/ft³ from the target in that document. For anything that depends on the weight, such as a trailer load, a lift or a structural dead load, ask the supplier for the density of the actual mix.
Common questions
Concrete weight questions
How much does a yard of concrete weigh?
About 3,780–4,050 lb, or 1.89–2.03 US short tons (1,715–1,837 kg). Normalweight concrete is 140 to 150 lb/ft³ according to NRMCA, and a cubic yard is 27 cubic feet. The reference value of 150 lb/ft³ that ACI gives for normalweight concrete is 4,050 lb per yard.
How much does a cubic foot of concrete weigh?
About 140–150 lb (63.5–68.0 kg) for normalweight concrete. QUIKRETE’s datasheet lists a typical unit weight of approximately 140 lb/ft³ for its Concrete Mix, tested to ASTM C138.
How much does a cubic metre of concrete weigh?
About 2,243–2,403 kg. NRMCA states 2,240 to 2,400 kg/m³ for normalweight concrete; the small difference is rounding between the two unit systems.
How much does a 4-inch concrete slab weigh per square foot?
A 4 in slab holds 1/3 cubic foot of concrete per square foot, so it weighs about 46.7–50.0 lb per square foot. A 10 ft × 10 ft slab at that thickness is 4,667–5,000 lb.
How many yards of concrete are in a ton?
One US short ton is 2,000 lb, which is 0.49 to 0.53 cubic yards of normalweight concrete: roughly half a yard.
Does lightweight concrete weigh less?
Yes. NRMCA describes structural lightweight concrete as on the order of 90 to 115 lb/ft³ in place, compared with 140 to 150 for normalweight. The same 10 ft × 10 ft × 4 in slab would weigh 3,000–3,833 lb in structural lightweight concrete instead of 4,667–5,000 lb.
Is wet concrete heavier than dry concrete?
It can be. NRMCA notes that for structural lightweight concrete, the equilibrium (air-dry) density is approximately 3 to 8 lb/ft³ less than the fresh density, and that fresh density is what is checked in the field with ASTM C138. How much a normalweight mix changes depends on the mix and conditions, so use the supplier’s figure for hauling or lifting.
Can I use this to check a vehicle or lifting limit?
Use it as a planning estimate only. For a vehicle, trailer, hoist or structure with a weight limit, use the actual mix density from the supplier and the limit published for the equipment, and have the responsible professional confirm it.
Sources and limits
NRMCA CIP 36, Structural Lightweight Concrete (a copy hosted by a producer; densities, equilibrium versus fresh density, ASTM C138 acceptance). ACI Concrete Terminology (normalweight reference of 150 lb/ft³). QUIKRETE Concrete Mix datasheet, product 1101 (typical unit weight about 140 lb/ft³). CIP 36 and the datasheet were read in full on October 12, 2026.
Unit conversions are exact (1 lb = 0.45359237 kg, 1 ft = 0.3048 m); displayed values are rounded. For gravel and stone by the ton, use the tons to cubic yards calculator.
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