Geotechnical & Concrete Tools
Free concrete and geotechnical calculators — cement, sand, aggregate and water for any pour from the mix grade, in bags and cubic metres.
Geotechnical & Concrete tools
Why These Tools
Dry sand and stone are mostly air until the mixer turns, which is why ordering three cubic metres of material for a three cubic metre slab leaves you half short. Concrete Mix Ratio Calculator applies that correction before anything else, then divides the result into cement bags, sand, aggregate and litres of water across six nominal grades from lean M5 fill to M25 for columns, each carrying the water-cement ratio normally specified with it.
Rebar weight and spacing, steel quantities, footing sizes and foundation depths come next, followed by the ground itself: soil bearing capacity, compaction, slope stability and excavation volumes.