Concrete Weight Calculator (lb, kg, tons)
Estimate the weight of poured concrete from its volume or slab size.
Returns pounds, kilograms, US tons, and metric tonnes, plus an optional haul cost.
Why weigh concrete instead of just measuring volume?
Ready-mix is ordered by volume, almost always in cubic yards, but plenty of jobs need the weight: checking whether a slab overloads a floor or a trailer, sizing a crane pick, or pricing demolition haul-off by the ton. Most ready-mix tickets never print a weight, which is exactly why people get caught out at the scale.
The number that matters: density
Normal-weight concrete runs about 150 pounds per cubic foot once cured. That works out to roughly 4,050 pounds per cubic yard, or about 2,400 kilograms per cubic meter. Lightweight structural mixes drop to 90 to 115 pounds per cubic foot, and heavyweight shielding concrete can climb past 300. The calculator defaults to 150 but lets you set your own figure, because the mix design, the aggregate, and how wet it still is all move the number.
How the math runs
First the volume is converted to cubic feet. A slab is length times width times thickness, with thickness in inches divided by 12 to get feet. Then weight is simply volume times density. From pounds the calculator derives kilograms (multiply by 0.4536), US short tons (divide by 2,000), and metric tonnes (kilograms over 1,000).
What this estimate leaves out
Reinforcing steel, embedded plates, forms, and any water still leaving green concrete are not in the figure. Fresh concrete weighs a little more than the same volume fully cured because of mix water. Treat the result as a solid planning estimate for ordering, loading, and disposal, then confirm against the supplier batch weight when a structural margin is tight.