Convert Concrete Volume Into Weight
Use this Concrete Weight Calculator to estimate the weight of concrete for slabs, patios, driveways, walls, footings, columns and piers. Enter the finished project dimensions and a concrete density to calculate approximate weight in pounds, US tons, kilograms and metric tonnes, with optional extra allowance for material planning.
Estimate concrete volume and weight for rectangular, cylindrical and linear pours, or calculate weight from a known concrete volume.
Enter length, width, thickness, density and quantity to estimate the weight of one or more identical rectangular concrete sections.
Finished concrete length
Finished concrete width
Concrete thickness
Use your mix data when available
Use diameter and height or depth to estimate the volume and weight of round concrete sections.
Calculate the weight of continuous rectangular concrete sections using length, height or depth and thickness or width.
If you already know concrete volume, enter it directly and convert that quantity into an estimated concrete weight.
A Concrete Weight Calculator estimates how heavy a concrete element or quantity of concrete may be. Instead of stopping at cubic feet, cubic yards or cubic meters, the calculator combines project volume with an assumed or known concrete density. The result can then be expressed in pounds, US tons, kilograms and metric tonnes.
This is useful for planning demolition and debris removal, checking approximate transport loads, understanding how much material is involved in an existing slab, comparing concrete mix densities, estimating lifting requirements, and converting an already-known concrete volume into a practical weight figure.
The key limitation is density. Concrete is not a material with one universal weight per cubic foot. Aggregate type, mix proportions, air content, reinforcement, moisture and specialty mix design can all affect density. For that reason, the density field in this calculator is editable. A generic value can be useful for planning, but project-specific supplier or engineering data should take priority when available.
The calculation has two stages. First, determine the concrete volume using the geometry of the project. Second, multiply that volume by the concrete density. If the density is entered in pounds per cubic foot and the volume is in cubic feet, the result is directly in pounds.
Use finished concrete length, width, thickness, diameter, height or depth.
Calculate cubic feet for the shape being estimated.
Enter a density appropriate for the concrete mix.
Multiply volume by density to estimate total pounds.
Review the same estimate in tons, kilograms and metric tonnes.
With volume in ft³ and density in lb/ft³, the result is pounds. The calculator then converts pounds to US tons, kilograms and metric tonnes.
Density is the amount of mass contained in a given volume. Two concrete mixes can occupy the same one-cubic-yard space while weighing different amounts. Lightweight concrete uses lower-density materials or mix designs, while heavyweight concrete can use dense aggregates for specialized applications.
A planning value around the mid-140s lb/ft³ is often used for ordinary normal-weight concrete estimates, but this should not be treated as a guaranteed property of every mix. The safest approach is to use the density stated in the project specifications, supplier data, material submittal or engineering documentation when that information is available.
| Concrete Type | Example Planning Density | Approx. Weight per yd³ | Use of Calculator |
|---|---|---|---|
| Lightweight example | 110 lb/ft³ | 2,970 lb | Enter 110 in density field |
| Normal-weight example | 145 lb/ft³ | 3,915 lb | Default planning example |
| Denser mix example | 150 lb/ft³ | 4,050 lb | Enter 150 if appropriate |
| Heavyweight example | 180 lb/ft³ | 4,860 lb | Use only when project data supports it |
This weight-specific figure shows the calculation path from project geometry to cubic feet, density and final weight.
Consider a slab that is 20 feet long, 12 feet wide and 4 inches thick. Convert the thickness to feet by dividing 4 by 12, which gives approximately 0.3333 foot. Multiply 20 × 12 × 0.3333 to obtain approximately 80 cubic feet of concrete.
If the planning density is 145 lb/ft³, multiply 80 × 145. The estimated concrete weight is 11,600 pounds. Dividing by 2,000 converts that figure to approximately 5.80 US tons. The same weight is about 5,262 kilograms or 5.26 metric tonnes.
This example demonstrates why both volume and density matter. Changing the slab dimensions changes volume. Changing the assumed density changes weight even when the physical dimensions stay exactly the same.
A cubic yard is a volume equal to 27 cubic feet. To estimate the weight of one cubic yard, multiply the concrete density in pounds per cubic foot by 27. At an example density of 145 lb/ft³, one cubic yard weighs about 3,915 pounds, or about 1.96 US tons.
| Density | Weight per ft³ | Weight per yd³ | Approx. US Tons / yd³ |
|---|---|---|---|
| 110 lb/ft³ | 110 lb | 2,970 lb | 1.49 tons |
| 125 lb/ft³ | 125 lb | 3,375 lb | 1.69 tons |
| 145 lb/ft³ | 145 lb | 3,915 lb | 1.96 tons |
| 150 lb/ft³ | 150 lb | 4,050 lb | 2.03 tons |
| 180 lb/ft³ | 180 lb | 4,860 lb | 2.43 tons |
The weight of one cubic foot is numerically equal to the density when density is expressed in pounds per cubic foot. For example, concrete with a density of 145 lb/ft³ weighs approximately 145 pounds for each cubic foot of material.
This makes cubic-foot calculations especially convenient for small projects. Once you have the volume in cubic feet, the weight estimate is simply the volume multiplied by the selected density.
Metric projects often describe concrete density in kilograms per cubic meter. The calculator accepts density in lb/ft³ for consistency across its four modes, then converts the final result to kilograms and metric tonnes. If your project documentation provides density in kg/m³, convert that value first or use the supplier's corresponding imperial density if available.
One cubic meter contains approximately 35.315 cubic feet. At a planning density of 145 lb/ft³, one cubic meter would therefore weigh about 5,120 pounds, or about 2,322 kilograms. This is an estimate based on the selected density, not a universal weight for every cubic meter of concrete.
Concrete changes as it cures, and moisture conditions can affect measured mass. Fresh concrete includes mix water and is handled as a plastic material before hardening. Hardened concrete may later gain or lose moisture depending on exposure and service conditions.
For planning, use the density that corresponds to the condition and mix you actually need to evaluate. If you are calculating truck payload, pumping, lifting, demolition debris or structural dead load, the appropriate density basis may be different. Engineering documents and supplier data should govern where accurate loads matter.
Yes. The calculator estimates the weight of the concrete material itself. Reinforcing steel, wire mesh, embeds, anchors, post-tensioning components and other materials add weight to the completed assembly.
If you need the total dead load of a reinforced structural element, concrete weight alone is not enough. Calculate the concrete component and reinforcement separately using project drawings and material quantities, or use the loads specified by the structural engineer.
Estimate how much mass may need to be transported when moving broken concrete or material.
Understand why concrete elements quickly become too heavy for casual lifting methods.
Compare the effect of lightweight, normal-weight and denser mixes using different density values.
Convert dimensions into both volume and mass for a more complete material estimate.
Concrete density varies. A convenient generic value is not a substitute for project-specific material data where accuracy matters.
A 4-inch slab is 0.3333 foot thick, not 4 feet. The calculator handles the conversion automatically for its inch-based thickness fields.
Excavations can include room for base material, drainage, formwork and construction access. Enter the dimensions of the concrete itself.
The calculator estimates concrete weight only. Steel and other embedded items add additional mass.
This tool is for planning. Do not use a generic online estimate in place of engineered lifting calculations, verified dimensions or certified equipment ratings.
Concrete demolition can generate very heavy debris. Estimating the original slab or wall volume and multiplying by a reasonable density can help you understand the scale of material involved before arranging containers, hauling or disposal.
However, demolished concrete contains voids when broken into chunks, and a dumpster's volume capacity is not the same as its allowable weight. Haulers may impose strict payload limits. Always confirm the container's permitted load and the carrier's requirements rather than relying only on geometric volume.
Large flatwork projects are easy to measure but can become surprisingly heavy. A relatively thin slab spread over hundreds of square feet can contain many cubic yards of concrete. The slab mode makes this relationship visible by showing volume first and then converting it to weight.
For ordering concrete rather than estimating mass, use the Concrete Yard Calculator or Ready Mix Concrete Calculator. If the project is small enough to consider packaged material, the Concrete Bag Calculator can compare common bag sizes.
| Weight Unit | Relationship | Calculator Use | Typical Context |
|---|---|---|---|
| Pound (lb) | Base output from lb/ft³ density | Displayed directly | US material and load estimates |
| US ton | 2,000 lb | Pounds ÷ 2,000 | Hauling and disposal planning |
| Kilogram (kg) | 1 lb ≈ 0.453592 kg | Converted automatically | Metric weight reference |
| Metric tonne | 1,000 kg | Kilograms ÷ 1,000 | Metric transport and planning |
A material calculator can estimate volume and weight, but structural design, concrete properties and construction requirements go much further. For technical education and industry resources, see the American Concrete Institute and the National Ready Mixed Concrete Association.
For structural loads, lifting operations, transport limits, demolition planning or permit-related work, follow approved project documents, local requirements and qualified professional advice where appropriate.
Use the calculator that matches the question you are trying to answer. Weight is only one part of concrete planning.
Common questions about concrete density, pounds per cubic foot, cubic-yard weight, slabs, wet concrete and metric conversions.