Concrete Weight Calculator
Concrete weight = volume × density — about 150 lb per cubic foot, or 4,050 lb per cubic yard, for normal-weight concrete. A 10 × 10 ft slab 4 in thick is 33.3 ft³ and weighs about 5,000 lb (2.5 US tons). To size the pour itself, use the Concrete Calculator.
How it's calculated: Weight = volume × density (normal-weight ≈ 150 lb/ft³; structural lightweight ≈ 115; heavyweight ≈ 215).
Result appears here
Fill in the fields and press Calculate.
Formula, calculation, assumptions and sources
Weight = Volume × density
Normal-weight concrete density ≈ 2,400 kg/m³ (150 lb/ft³)
Run the calculation to see each step with your own numbers.
A 10 ft × 10 ft slab, 4 in thick, normal-weight concrete.
Volume = 33.3 ft³
Weight = 33.3 × 150 = 5,000 lb = 2.5 US tons
- Fresh/cured normal-weight concrete unless you pick another type. Reinforcement adds a small amount (steel is denser) that this does not include.
- Density is the standard reference value — a specific mix can vary a few percent.
- Does a cubic yard of concrete weigh 4,000 lb?
- Close — 1 yd³ = 27 ft³ × 150 lb/ft³ = 4,050 lb, about 2 US tons. That's why ready-mix trucks carry only ~8–10 yd³.
- Which concrete type should I pick?
- Normal-weight covers almost all footings, slabs and walls. Choose structural lightweight only if the mix was specified that way (often for upper floors to cut dead load), and heavyweight only for radiation shielding or ballast.
- Does the reinforcing steel change the answer?
- Only slightly at normal residential reinforcement. A heavily reinforced structural member might read a few percent higher. This calculator returns the plain concrete weight.
- How much does a 10×10 concrete slab weigh?
- About 5,000 lb (2.5 US tons) at 4 in thick: 10 × 10 × 0.333 ft = 33.3 ft³, × 150 lb/ft³. At 6 in thick the same slab weighs about 7,500 lb.
- How much does concrete weigh per cubic foot?
- About 150 lb for normal-weight concrete (2,400 kg/m³). Structural lightweight concrete is roughly 90–115 lb/ft³, and heavyweight concrete used for shielding about 215 lb/ft³.
Concrete density
Normal-weight fresh concrete ≈ 2,400 kg/m³ (≈150 lb/ft³). Portland Cement Association (PCA), 'Design and Control of Concrete Mixtures' (EB001).
Lightweight / heavyweight ranges
ACI 213R (structural lightweight ~90–115 lb/ft³) and ACI 304.3R (heavyweight). Values shown are typical.
About the Concrete Weight Calculator
The Concrete Weight Calculator converts a concrete volume — entered as slab dimensions or as a volume you already have — into a weight, so you can check a trailer or truck load limit, a shoring or formwork load, or the debris weight for a demolition. Pick normal-weight, structural-lightweight or heavyweight concrete; the default is standard normal-weight at about 150 lb/ft³ (2,400 kg/m³). Reinforcing steel adds a little on top of this figure.
What you enter
- Enter
- Length
- Width
- Thickness
- Volume
- Concrete type
What you get back
- Concrete weight — the exact result of the calculation.
- Volume — the exact result of the calculation.
The formula, a worked example, the assumptions behind it and the sources are shown in full below the calculator.
Related calculators
- Concrete Calculator — How much concrete a rectangular slab or footing needs, in cubic yards or cubic metres.
- Cubic Yard Calculator — Convert a length, width and depth into cubic yards, cubic feet or cubic metres.
- Concrete Cost Calculator — Estimated material cost of a concrete pour from its volume and a unit price.
- Wall Concrete Calculator — Concrete volume for a poured foundation or retaining wall.
Related articles
- What Is Concrete Made Of? — Concrete is cement, water, fine aggregate and coarse aggregate — and the ratio between them determines almost everything about the finished material.
Part of the Concrete calculators.