Concrete Slab Calculator
Purpose-built for slab pours: enter slab thickness in mm or inches and get the pour volume, the waste-adjusted quantity and the slab surface area for finishing and formwork take-off.
Disclaimer：Results are produced by deterministic formulas and are intended for quantity estimating and option comparison only. A qualified engineer must verify them against the project specification, design documents and actual site conditions before use. The author accepts no liability for any loss arising from their use.
ASSUMPTIONS
RESULT
CALCULATION
METHOD
Slab volume
V = L × W × t, with t converted to metres; surface area A = L × W is used for finishing and formwork measurement.- Volumetric method: volume = cross-sectional area × thickness, the standard basis for concrete quantity take-off.
- Waste allowance and density are empirical values; verify them against the project specification and the approved mix design.
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