Concrete Engineering Calculators
Volume and mix calculators for slabs, footings and columns, plus the detailing checks that follow: formwork pressure, blockwork, development length, stairs and plaster.
Concrete Volume Calculator
Build a multi-item concrete quantity schedule for slabs, footings, beams, walls and columns, with category subtotals and an Excel export.
Per item: V = L x W x H (slab, beam, wall, curb) | L x W x D (footings) | A x H (columns) | (PI/4) D^2 x H (circular). Totals: net = SUM(items); supply = net + wastage%. Slab Concrete Volume Calculator
Calculate concrete volume for rectangular and L-shaped slabs with slab count and wastage margins.
V = A_plan × H · V_total = V × n · V_ready = V_total × (1 + wastage/100) · Bags = ceil(V_ready / 0.033) Footing & Foundation Volume Calculator
Calculate concrete required for spread (pad) footings and strip footings, per-footing and total volumes with ready-mix allowance.
V = L × W × D × n · V_ready = V_total × (1 + wastage/100) Column Concrete Volume Calculator
Accurate concrete requirements for round, square, and rectangular structural columns.
V = A × H × n · A = (π/4)d² round, b×b square, w×d rectangular Concrete Mix Design Calculator
Compute per-batch and per-cubic-meter quantities of cement, sand, aggregate, and water from a mix ratio.
V_dry = V × 1.54 · M_mat = V_dry × (ratio / Σ ratios) · Water = w/c × cement mass Concrete Formwork Pressure Calculator
Lateral formwork pressure for a concrete pour from placement rate, temperature and unit weight, capped at the hydrostatic head.
p = Cw Cc (7.2 + 785 R/(T + 17.8)), capped at the fresh lift hydrostatic head Concrete Block Wall Calculator
Block count and bedding mortar quantity for a block wall, with an opening deduction and a waste allowance.
N = A_net x 12.5 blocks/m2 ; mortar = A_net x 0.028 m3/m2 Rebar Development & Splice Calculator
Tension development length and Class A and B lap splices for a bar diameter, steel grade and concrete strength.
ld = (fy x psi_t x psi_e x psi_s) / (2.1 x lambda x sqrt(fc)) x db Staircase Concrete Volume Calculator
Concrete volume of a reinforced concrete staircase, split into waist slab, steps and landing.
L = sqrt((n g)^2 + (n r)^2) ; V = L t w + n (0.5 r g w) Chloride Ingress & Cover Durability Calculator
Fickian chloride diffusion to the reinforcement, reporting the time to corrosion at your cover and the cover needed for the design life.
C(x,t) = Cs * erfc(x / (2*sqrt(D*t))) Plaster & Screed Volume Calculator
Plaster volume, dry mix volume, cement bags and sand quantity for a given area, thickness and mix ratio.
V_wet = A t ; V_dry = 1.33 V_wet ; cement = V_dry x kg per m3 of the chosen mix