Mathematics is the queen of the sciences.C. F. Gauss

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Concrete & footing calculator

Slab, strip and pier foundations with concrete volume, premix bags and component materials.

6

Enter known values

Fill in the fields below — the result will appear alongside.

Live construction diagram
L = 0 ftW = 0 ftt = 0 in
Slab foundation
ft
ft
in
ft3
lb
lb
lb

Formulas

Vslab=LWhV_{slab}=LWhVstrip=LsWsDsV_{strip}=L_sW_sD_sVpiers=nπ(d/2)2hV_{piers}=n\pi(d/2)^2hVt=V(1+w/100)V_t=V(1+w/100)Nmix=⌈Vt/Vb⌉N_{mix}=\lceil V_t/V_b\rceilVc=Vtcc+s+gV_c=V_t\frac{c}{c+s+g}

How it works

Choose a slab, continuous strip footing or cylindrical piers. The calculator includes waste, ready-mix bag yield and a configurable cement–sand–gravel ratio.

Dimensions are converted to one system before volume is calculated. Component masses use reference bulk densities, so supplier specifications and structural drawings remain authoritative.

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