🚚 Concrete Mix Calculator
Pour size and strength grade
Length
Width
Thickness
(4 in / 10 cm is a typical slab)
Strength grade
(nominal site mixes — ratio shown in the result)
About 1,500 psi — lean mix 1 : 3 : 6 (blinding, non-structural)
About 2,200 psi — 1 : 2 : 4 (footings, paths, mass fill)
About 3,000 psi — 1 : 1.5 : 3 (slabs, driveways, general structural)
About 3,600 psi — 1 : 1 : 2 (high strength, beams and columns)
Waste allowance (%)
(extra for cuts, spills and uneven ground — 10% is the usual rule)
Calculate mix
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