METHOD
Formula and method
Volume = length × width × thickness × (1+allowance/100).
Concrete volume and cost for a rectangular slab
Estimate concrete for a rectangular slab.
01
Your inputs
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02
Your result
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About this result
Informational calculations. Check assumptions, dates and jurisdiction before making a decision.
Full disclaimerHow much concrete does a slab need?
Volume is length times width times thickness, increased by the percentage allowance you enter. You can enter dimensions in metres or feet and get the result in cubic metres and cubic yards, with the cost from a price per cubic metre. A 5 × 4 m slab 10 cm thick with a 10% allowance needs 2.2 m³, which at 150 KM per cubic metre costs 330 KM. The estimate is geometric and does not check load capacity or reinforcement.
TRACEABLE
Sources and validity
Basic arithmetic or geometry using the formula shown. Uses only your inputs.
How we maintain data