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Concrete Weight Calculator

Ready to calculate
ACI 318 Reference.
4 Concrete Types.
lb · kg · tons · tonnes.
100% Free.
Privacy Secure.

How it Works

01Pick Type

Normal, reinforced, lightweight, or heavyweight — densities from 105 to 240 lb/ft³.

02Volume or Dims

Enter cubic yards directly, or length × width × thickness.

03Density Applied

Weight = volume × density. Default normal-weight is 150 lb/ft³.

04All Units

Pounds, kilograms, US short tons, metric tonnes — all four at once.

What is a Concrete Weight Calculator?

A concrete weight calculator — also called a concrete density calculator — tells you exactly how much a slab, footing, column, beam, driveway, or truckload of ready-mix concrete weighs in pounds, kilograms, US short tons, and metric tonnes. Concrete weight matters more than most DIYers realize: trucking limits, crane pick capacities, formwork shoring loads, bridge and floor dead loads, elevator hoist specs, and construction-site material staging are all weight calculations first and volume calculations second. A cubic yard of concrete weighs roughly 4,050 pounds — the same as a Ford F-150 pickup — and a full ready-mix truck can carry 36,000 to 40,000 lb of concrete alone on top of the truck's own 20,000 lb tare weight.

This tool uses the ACI 318 standard 150 lb/ft³ (2,400 kg/m³) density for normal-weight concrete, with three additional specialty options: reinforced concrete at 156 lb/ft³ (accounting for embedded rebar), lightweight concrete at 105 lb/ft³ (expanded shale/slate/clay aggregate for high-rise floors and roof decks), and heavyweight concrete at 240 lb/ft³ (barite or magnetite aggregate for radiation shielding in medical, nuclear, and linear-accelerator vaults). Each covers a distinct engineering application, and picking the wrong density can be a 60% error in either direction.

Enter either a direct volume in cubic yards, or full length × width × thickness dimensions — the tool auto-converts ft² × inches into cubic yards. You get weight output in all four common units (pounds, kilograms, US short tons, metric tonnes) simultaneously, so you can pass the number to any stakeholder — a US trucker checking DOT weight limits, a Canadian crane operator rigging a precast panel, or an international engineer reviewing a bridge dead-load calculation — without doing a second round of unit conversion.

No waste factor is applied to this calculator — that's by design. This tool reports true in-place concrete weight, not ordering quantity. For ordering waste-inclusive concrete bagged or delivered, use the concrete calculator instead. Also outputs cubic meters for metric compatibility.

Ready-mix dispatchers, concrete contractors, crane operators, structural engineers, shipping estimators, and DIY pourers scoping whether a driveway slab will strain their subgrade all use this math. A full truckload means commercial driver licensing, DOT weight-station scales, and weight-distributed axle groups — not the kind of thing you want to learn by having a truck bottom out on a residential driveway.

How the Concrete Weight Calculator Works

Pick density — normal 150 lb/ft³, reinforced 156, lightweight 105, heavyweight 240. Reinforced accounts for embedded rebar; lightweight uses expanded aggregate; heavyweight uses barite or magnetite.
Enter volume — either cubic yards directly, or length × width × thickness (ft × ft × in). Dimensions mode auto-computes ft³.
Weight = Volume × Density. Convert ft³ to m³ for metric. Weight in lb then converted to kg (÷2.20462), US short tons (÷2,000), and metric tonnes (kg÷1,000).
Four units at once so you can pass the number to any stakeholder — US trucker, Canadian crane op, or international engineer — without re-doing the math.
No waste factor applied — this tool reports true volume weight, not delivery quantity. Use the concrete calculator for waste-inclusive ordering.

Concrete Weight Formula

Density times volume, with unit conversions:

Weight_lb = Volume_ft³ × Density_lb/ft³
Weight_kg = Weight_lb / 2.20462
Weight_US_tons = Weight_lb / 2,000
Weight_metric_tonnes = Weight_kg / 1,000
Volume_ft³ = L_ft × W_ft × T_in / 12
Volume_yd³ = Volume_ft³ / 27
Volume_m³ = Volume_ft³ × 0.0283168
Normal-weight density: 150 lb/ft³ (2,400 kg/m³)

150 lb/ft³ comes from Portland cement (190 lb/ft³) + stone aggregate (165 lb/ft³) + sand (100 lb/ft³) + water (62.4 lb/ft³) weighted by typical mix proportions. ACI 318 uses this as the standard for structural load calculations.

Real-World Example

Worked Example

A residential driveway slab: 20 ft × 10 ft × 4 in thick, normal-weight concrete:

  • Volume = 20 × 10 × (4/12) = 66.67 ft³
  • Cubic yards = 66.67 / 27 = 2.47 yd³
  • Weight = 66.67 × 150 = 10,000 lb (to 3 sig figs)
  • Metric = 10,000 / 2.20462 = 4,536 kg = 4.54 metric tonnes
  • US tons = 10,000 / 2,000 = 5.00 US tons
  • A full ready-mix truck (9 yd³) = ~36,500 lb just of concrete, not counting the truck itself (~20,000 lb empty).

Who Uses This Calculator?

1
Ready-mix dispatchers checking truck loading against DOT 80,000 lb gross weight limits (34,000 lb tandem axle limit)
2
Concrete contractors sizing formwork shoring — a 12-inch slab at 20×20 ft weighs 12 tons pushing down on the forms
3
Crane operators rigging precast concrete panels and tilt-up wall sections for pick-and-place installation
4
Structural engineers verifying dead-load calculations on floor systems, bridge decks, and retaining walls against design assumptions
5
Shipping estimators quoting long-haul freight for precast concrete, pavers, segmental retaining blocks, and septic tanks
6
Demolition contractors sizing haul-out truck capacity for broken concrete slabs (concrete wreckage = 4,050 lb/yd³)
7
DIY pourers checking whether a driveway or patio slab will strain their compacted-gravel subgrade
8
Elevator and hoist designers specifying load ratings for concrete mix delivery to upper floors during new-construction builds
9
Bridge engineers computing dead loads for pre-stressed girders and cast-in-place deck overlays
10
Warehouse and industrial designers verifying slab-on-grade weight against soil-bearing capacity

Technical Reference

ACI 318 — American Concrete Institute Building Code Requirements for Structural Concrete. Section 19.2.3 defines normal-weight concrete density as 150 lb/ft³ (2,400 kg/m³) nominal for structural load calculations. This is the number used by every US structural engineer and code reviewer for dead-load calculations.

ACI 213R — Guide for Structural Lightweight-Aggregate Concrete. Lightweight concrete density range 90-115 lb/ft³ (1,440-1,840 kg/m³), with 105 lb/ft³ typical for structural lightweight. Saves 25-35% dead load in high-rise applications, enabling taller buildings within the same foundation capacity.

ACI 304R — Guide for Measuring, Mixing, Transporting, and Placing Concrete, including heavyweight concrete (over 160 lb/ft³). Barite (barium sulfate) aggregate gives 220-260 lb/ft³; magnetite (iron oxide) gives 230-290 lb/ft³. Used exclusively for radiation shielding.

ASTM C138 — Standard Test Method for Density (Unit Weight), Yield, and Air Content of Concrete. Required on every structural pour — verifies the delivered mix matches the design density assumption. Out-of-spec density means re-engineering or rejection of the pour.

Density conversion constants — 1 lb/ft³ = 16.01846 kg/m³; 1 ft³ = 0.02832 m³; 1 US short ton = 2,000 lb; 1 metric tonne = 2,204.62 lb = 1,000 kg.

Key Takeaways

Concrete is dense. Putting numbers on intuition: a single cubic yard weighs 4,050 lb (roughly a Ford F-150 pickup); a 9-yard ready-mix truckload weighs 36,450 lb of concrete alone, plus the 20,000 lb empty truck = 56,450 lb gross, which is why concrete haulers are considered heavy commercial vehicles and require CDL licensing and DOT weight-station compliance. Lightweight concrete saves 25-35% dead load for high-rise floors — a game-changer for the upper stories of a 40-story tower where the structural frame must support every lb above it. Heavyweight concrete (barite aggregate) is dense enough to shield gamma radiation in medical X-ray rooms, nuclear power facilities, and linear-accelerator therapy vaults. For any structural work, always use project-specific density from your mix design — the 150 lb/ft³ default is a planning number, not a final spec. Density testing per ASTM C138 is required on every structural pour to verify the delivered mix matches the design assumption.

Frequently Asked Questions

How much does concrete weigh per cubic yard?
Normal-weight concrete weighs about 4,050 lb per cubic yard (150 lb/ft³ × 27 ft³/yd³). Reinforced concrete is slightly heavier at 4,212 lb/yd³ including embedded rebar.
How much does a yard of concrete weigh in tons?
One cubic yard of normal-weight concrete weighs about 2.03 US short tons (4,050 lb / 2,000 lb/ton) or 1.84 metric tonnes. Add 2-4% for reinforced.
How much does a cubic foot of concrete weigh?
Normal-weight concrete weighs 150 lb/ft³ (2,400 kg/m³). That's the ACI 318 default for structural calculations. Lightweight concrete is 105 lb/ft³, heavyweight (barite) up to 240 lb/ft³.
How much does a concrete driveway weigh?
A standard 20 × 10 × 4 inch driveway slab weighs about 10,000 lb (5 US tons). A 24 × 24 × 4 inch two-car driveway weighs about 28,800 lb (14.4 US tons).
How much does a concrete truck weigh?
A fully loaded ready-mix truck weighs about 66,000-80,000 lb — roughly 20,000 lb empty truck + 36,000-40,000 lb of concrete (9-10 yd³). This is why they require commercial driver licenses and hit DOT weight limits on many roads.
What is the difference between weight and density?
Density is mass per unit volume (lb/ft³ or kg/m³). Weight is the total mass of a specific volume (lb or kg for a given pour). Density is a material property; weight depends on how much of the material you have.
Does reinforced concrete weigh more than plain concrete?
Yes, slightly. Plain concrete is 150 lb/ft³. Add typical rebar (1-2% by volume at 490 lb/ft³ steel density) and the effective density rises to 155-160 lb/ft³. Heavily reinforced columns and beams can reach 165 lb/ft³.
Why is lightweight concrete lighter?
Lightweight concrete uses expanded shale, slate, or clay aggregate instead of normal stone. The expanded aggregate has trapped air voids, cutting density from 165 lb/ft³ (stone) to 50-70 lb/ft³. That drops the whole mix to 90-115 lb/ft³ — saving 25-35% dead load on high-rise floors.
What is the heaviest concrete used for?
Heavyweight concrete (barite or magnetite aggregate) at 200-400 lb/ft³ is used for radiation shielding in nuclear plants, medical X-ray rooms, and linear accelerator vaults. The dense aggregate absorbs gamma rays and neutron radiation much better than normal concrete.
How do I calculate concrete weight from cubic meters?
Multiply cubic meters by the density in kg/m³. Normal-weight concrete: m³ × 2,400 kg/m³ = kg. Divide by 1,000 for metric tonnes. Multiply kg by 2.20462 for pounds. This tool gives all four units automatically.

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Disclaimer

Educational reference. For structural load calculations or permit submittals, always use project-specific density from your mix design and verify with a licensed engineer.