Use this concrete weight calculator to estimate solid concrete mass from its volume or dimensions and an explicit material density.
Use solid volume and a density for the actual mix
Start with a known solid volume, or measure a rectangular slab, round column or hollow round tube. Each dimension has its own unit selector. Hollow-tube volume excludes the central opening; the inner diameter must be smaller than the outer diameter. The visible default density of 150 is an editable illustration, not a specification for your mix. An archived FHWA report describes observed normal-weight concrete densities around 140 to 155 ; it does not establish a universal value or a current design requirement. Enter measured or supplier density when available. Switching to clears the density entry so 150 is not silently reused in a different unit.
Exclude hollow cores and gaps between loose fragments. Measure each shape dimension in the unit shown beside it.
Use the density for the actual material. The editable starting density is an assumption; US short tons and metric tonnes are different units.
Concrete Weight Calculator example
Enter a solid volume of 1 and a density of 150 . The engine returns 4,050 lb, 1,837.0491 kg, 2.025 US short tons and 1.8370491 metric tonnes. The 150 is the assumed density for this example.
For the slab preset, a 10 by 10 face with a 4 thickness at the same density gives 5,000 lb. A separate metric example, 1 at an entered 2400 , gives 2,400 kg. None of these examples supplies a measured density for your project.
Solid concrete volume and mass at an assumed density
Each row assumes the same entered density of 150 and a known solid volume. These are engine-derived examples, not measured weights or supplier specifications.
| Solid volume | Pounds | Kilograms | US short tons | Metric tonnes |
|---|---|---|---|---|
| 1 | 150 | 68.0388555 | 0.075 US short tons | 0.0680388555 metric tonnes |
| 1 | 4,050 | 1,837.0491 | 2.025 US short tons | 1.8370491 metric tonnes |
| 1 | 5,297.20001 | 2,402.76951 | 2.6486 US short tons | 2.40276951 metric tonnes |
Display values use up to nine significant digits. Changing density changes mass proportionally; shape or pile volume alone does not identify density.
Keep pounds, short tons and metric tonnes distinct
Mass equals solid volume multiplied by density after matching their volume units. The result unit can be changed in More options. A US short ton contains 2000 ; a metric tonne contains 1000 . The exact pound definition is 0.45359237 . These definitions make the units convertible, but the numbers labeled short tons and metric tonnes are different.
Slab volume is length × width × thickness. A round column uses π × (diameter ÷ 2)² × height. A hollow tube subtracts the inner circular cross-section from the outer one before multiplying by height. The engine preserves intermediate precision and formats the final mass; it does not round up a buying quantity.
Loose rubble volume is not solid concrete volume
A pile of broken concrete contains air gaps. Its outside pile volume is not the volume of the concrete material inside it. This tool requires the solid material volume and the density of that material; it does not infer a rubble packing factor or a mixed-waste density.
An estimated material mass does not establish a truck payload, floor load, lifting limit or formwork capacity. Use Concrete Calculator for poured volume and bag coverage, Concrete Block Calculator for hollow masonry-unit counts and entered core fill, and Rebar Calculator for reinforcing-steel quantities. Use Square Footage Calculator to measure an irregular face. Multiply that area by thickness in matching units, then enter the resulting volume in Known solid volume.