Typical concrete densities
Densities below are published typical values used for planning; the actual density of a specific mix is determined by test (ASTM C138 for fresh density) and stated on the mix design.
| Concrete type | Typical density (kg/m³) | Approx. (lb/ft³) | Weight of 1 m³ |
|---|---|---|---|
| Normal-weight (plain) | ~2,400 | ~150 | 2.4 t |
| Reinforced (with steel) | ~2,500 | ~156 | 2.5 t |
| Structural lightweight | ~1,440–1,840 (calc uses 1,750) | ~90–115 | ~1.75 t |
- Actual density varies with aggregate type and moisture, entrained air content, and reinforcement ratio; heavily reinforced members can exceed 2,500 kg/m³ while lean or air-entrained mixes can fall below 2,400 kg/m³.
- Fresh (wet) concrete and hardened concrete differ only slightly in density — most mix water is retained in the hardened material — so the same figures are commonly used for both in planning.
- For demolition disposal, broken concrete rubble occupies more volume than intact concrete (bulking), so a load of rubble weighs less per cubic meter of truck space than these in-place densities suggest.
How much does concrete weigh?
Normal-weight concrete made with conventional sand and gravel or crushed-stone aggregate has a typical density of about 2,400 kg/m³ (roughly 150 lb/ft³). Adding steel reinforcement raises the average density slightly — about 2,500 kg/m³ is the conventional planning figure for reinforced concrete. Structural lightweight concrete, made with expanded clay, shale or slate aggregates, typically falls around 1,440–1,840 kg/m³; this calculator uses roughly 1,750 kg/m³ as a representative mid-to-upper value.
Concrete weight matters in practice for hauling and disposal (truck payload limits), for crane and hoist planning, and for estimating the dead load a slab or member adds to a structure. Because actual density varies with the specific mix — aggregate type, air content, moisture and reinforcement ratio — these published typical densities give a planning estimate, not a batch-ticket value.
How to use this concrete weight calculator
- Enter the volume of concrete in cubic meters (for a slab: length × width × thickness, all in meters).
- Select the concrete type — normal-weight, reinforced, or structural lightweight.
- Read the weight in tonnes (emphasized), kilograms and pounds, plus the density figure used.
- For hauling, compare the tonnage against your vehicle or trailer payload rating before loading.
The formula behind concrete weight
Weight equals volume multiplied by density. This calculator multiplies the entered volume in cubic meters by the published typical density for the selected concrete type (2,400, 2,500 or 1,750 kg/m³), then converts to tonnes (÷1,000) and pounds (×2.20462).
Worked example: 2 m³ of normal-weight concrete weighs 2 × 2,400 = 4,800 kg = 4.8 tonnes (about 10,582 lb). The same volume in structural lightweight concrete would weigh 2 × 1,750 = 3,500 kg = 3.5 tonnes.
Common mistakes
- Using the normal-weight density for a lightweight-aggregate mix (or vice versa) — the difference is roughly 25–30% of the total weight.
- Entering volume in cubic feet or cubic yards while the calculator expects cubic meters — 1 yd³ ≈ 0.7646 m³.
- Ignoring payload limits when hauling — even a modest 0.5 m³ of concrete rubble weighs around 1.2 tonnes, more than many pickup trucks and small trailers are rated to carry.
- Treating the result as a batch-ticket weight — actual mix density comes from the producer's mix design and density tests, not a published typical value.
Perguntas frequentes
How much does 1 cubic meter of concrete weigh?
Normal-weight concrete weighs about 2,400 kg (2.4 tonnes) per cubic meter. Reinforced concrete is usually taken as about 2,500 kg/m³, and structural lightweight concrete typically ranges from roughly 1,440 to 1,840 kg/m³.
How much does concrete weigh per cubic foot?
Normal-weight concrete weighs about 150 pounds per cubic foot. Structural lightweight concrete typically weighs roughly 90–115 lb/ft³, depending on the aggregate used.
Why is reinforced concrete heavier than plain concrete?
Steel has a density of about 7,850 kg/m³ — more than three times that of concrete — so replacing even 1–2% of a member's volume with rebar raises the average density. The conventional planning figure of about 2,500 kg/m³ for reinforced concrete reflects a typical reinforcement ratio.
Does concrete weigh less after it dries?
Only slightly. Most of the mix water is chemically bound or retained in the pore structure of hardened concrete, so the weight loss from curing and drying is small — planning calculations generally use the same density for fresh and hardened concrete.
How much does 2 cubic meters of concrete weigh?
About 4.8 tonnes (4,800 kg, or roughly 10,600 lb) for normal-weight concrete at 2,400 kg/m³. As reinforced concrete at 2,500 kg/m³ it would be 5 tonnes, and as structural lightweight concrete at about 1,750 kg/m³ it would be about 3.5 tonnes.
Referências
- ASTM C138/C138M — Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete.
- ACI Committee 213 — Guide for Structural Lightweight-Aggregate Concrete (ACI 213R): typical density ranges for structural lightweight concrete.
- Portland Cement Association (PCA) — Design and Control of Concrete Mixtures: typical densities of normal-weight and lightweight concrete.
- ASCE 7 — Minimum Design Loads and Associated Criteria for Buildings and Other Structures: commonly used unit weights for plain and reinforced concrete in dead-load calculations.