Concrete Weight Calculator
ConstructionCalculate the weight of a poured concrete slab from its length, width, thickness, and density. Get instant results in pounds and tons for hauling or load planning.
Total Weight
5,000
Total Weight (Tons)
2.5
What is a Concrete Weight?
A Concrete Weight Calculator determines how much a poured concrete slab weighs based on its length, width, thickness, and the density of the concrete mix used. This figure matters well beyond the initial pour — it's essential for structural load planning, demolition and haul-away logistics, and transportation calculations for precast elements.
Standard reinforced concrete weighs approximately 150 lb per cubic foot, making even a modest slab surprisingly heavy — a typical 10 ft × 10 ft, 4 in thick patio slab weighs roughly 2.5 tons. This calculator complements the Cubic Yard Calculator, which handles volume for ordering purposes, and the Concrete Calculator for broader slab and footing material estimates.
How to use this Concrete Weight calculator
- Enter the slab's Slab Length in feet.
- Enter the Slab Width in feet.
- Set the Slab Thickness in inches (4 in is standard for residential patios and walkways).
- Adjust the Concrete Density if you know your specific mix design (150 lb/ft³ is the standard default for reinforced concrete).
- Read the Total Weight result in pounds, and check Total Weight (Tons) for hauling or demolition planning.
Formula & Methodology
Volume (ft³) = length × width × (thickness (in) ÷ 12) Weight (lbs) = volume (ft³) × density (lb/ft³) Weight (tons) = weight (lbs) ÷ 2,000 Worked example: For a 10 ft × 10 ft slab, 4 in thick, at standard 150 lb/ft³ density: - Volume = 10 × 10 × (4 ÷ 12) = 10 × 10 × 0.333 ≈ 33.3 ft³ - Weight = 33.3 × 150 = 5,000 lbs - Weight in tons = 5,000 ÷ 2,000 = 2.5 tons This means a standard residential patio slab of this size would require roughly 2.5 tons of hauling capacity to remove — worth knowing before scheduling a demolition dumpster or truck.
Frequently Asked Questions
For a 10 ft × 10 ft slab poured at a standard 4 in thickness with typical reinforced concrete density of 150 lb/ft³, the slab weighs approximately 5,000 lbs, or 2.5 tons. Enter your exact slab dimensions and thickness into the Concrete Weight Calculator for a precise figure.
Standard reinforced concrete weighs approximately 150 lb per cubic foot, though plain (unreinforced) concrete is closer to 145 lb/ft³ and lightweight concrete mixes can be as low as 100-120 lb/ft³. The calculator's Concrete Density input defaults to 150 lb/ft³ but can be adjusted from 100 to 165 lb/ft³ to match your specific mix.
The calculator first finds the slab's volume by multiplying length × width × thickness (converting thickness from inches to feet), then multiplies that volume by the concrete's density in pounds per cubic foot. The result is converted to both total pounds and tons for easier reference depending on your use case.
Volume (ft³) = length × width × (thickness in inches ÷ 12). Weight (lbs) = volume × density (lb/ft³). Weight (tons) = weight (lbs) ÷ 2,000.
Knowing slab weight is critical for structural load calculations (what the ground or supporting structure below can bear), for planning demolition and disposal (haul-away trucks and dumpsters have weight limits), and for transportation logistics if precast slabs need to be moved by crane or truck. Underestimating slab weight can lead to structural failures or overloaded equipment.
Standard residential slabs (patios, walkways, garage floors) are typically 4 in thick, while driveways and slabs supporting vehicle loads often use 5-6 in, and heavy-duty industrial slabs can exceed 8 in. This calculator supports thicknesses from 1 to 24 in to cover everything from thin toppings to heavy structural slabs.
Reinforced concrete (containing rebar or wire mesh) is only marginally heavier than plain concrete per cubic foot — the steel reinforcement adds a small amount of weight, generally accounted for within the standard 150 lb/ft³ density figure. For most planning purposes, using 150 lb/ft³ is accurate whether or not the slab includes typical residential-grade reinforcement.
Enter the slab's Length and Width in feet, its Thickness in inches, and adjust the Concrete Density if you know your specific mix (150 lb/ft³ is the standard default). The calculator instantly returns the total weight in both pounds and tons.
Most roll-off dumpsters have weight limits ranging from 2 to 10 tons depending on size, and standard dump trucks typically max out around 10-14 tons per load. Use this calculator's Weight (Tons) output to estimate how many dumpster loads or truck trips a demolition project will require before hauling away a slab.
No, slab weight depends purely on volume and material density, not on location. However, outdoor slabs are more likely to use air-entrained concrete for freeze-thaw resistance, which can slightly reduce density compared to standard interior slabs — adjust the Concrete Density input if your mix specification differs from the 150 lb/ft³ default.
The [Cubic Yard Calculator](/cubic-yard-calculator/) tells you how much concrete volume you need to order for a pour, while this calculator tells you how much that finished slab will weigh once cured. Use both together when planning a project that involves both ordering concrete and later assessing structural load or demolition logistics.
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