Concrete Weight Calculator
Estimate how much a concrete slab, footing or block weighs.
Find the weight of a poured concrete element from its dimensions. Standard concrete weighs about 150 lb/ft³.
How the Math Works
The Concrete Weight Calculator uses the formula weight = volume (ft³) × density (lb/ft³). First, calculate volume by multiplying length × width × thickness (all in feet). For example, a 10 ft × 12 ft × 0.5 ft slab has 60 ft³ volume. Multiply this by concrete's standard density of 150 lb/ft³ to get 9,000 lbs total weight. This straightforward equation works for any rectangular shape, adjusting volume calculations for irregular forms by breaking them into simpler geometric sections.
Practical Applications
To apply this calculation, measure your concrete structure's dimensions in feet. For a slab, measure length and width; for footings, measure depth as thickness. Input these values into the calculator, ensuring consistent units. Contractors use this to estimate truck delivery quantities, ensure foundation supports can handle the load, and avoid costly over-ordering. Adjust the density value if using lightweight concrete (100 lb/ft³) or specialized mixes, as variations exist based on aggregate type and reinforcement.
Day-to-Day Use
This tool simplifies everyday construction planning. Homeowners can estimate material costs for DIY projects like backyard patios or garden beds, preventing underestimating expenses. It also helps assess whether existing structures can support new concrete additions, like a driveway extension. By quickly calculating weight, users make informed decisions about material choices, transportation logistics, and project safety—saving time and money while avoiding structural surprises.
Worked example
A 10×10 ft slab, 4 in thick → 33.3 ft³ × 150 = 5,000 lb (2.5 tons).
FAQ
How much does a yard of concrete weigh?
About 4,050 lb (≈2 tons) for normal-weight concrete.