Structural Steel Calculators
Beam capacity and deflection, column buckling, section properties and retaining wall stability for structural steel and groundwork checks.
Structural Framing Calculator
Screening-level RC framing takeoff: beams, core/shear walls, stair flights, and wall/soffit formwork derived from level count and floor plate.
Beams = Lines/Floor × Length × Levels × Section; Core = Plan Area × Thickness × Levels; Stairs = Risers × Going × Width × Flights; Formwork = Vertical Faces + Soffit Area Steel Beam Capacity Calculator
Allowable bending and deflection check for a simply supported steel beam, reporting which criterion governs.
M = wL^2/8 or PL/4 ; Mn = 0.66 x Fy x Sx ; governing load = min(bending, L/240 deflection) Beam Deflection Calculator
Elastic beam deflection for six support and loading arrangements, compared with the L/240 serviceability limit.
delta = k x w L^4 / EI or k x P L^3 / EI, with the limit taken as L/240 Falsework Load Calculator
Falsework load path from slab self-weight and imposed construction load down through the bearer, props and sole boards, checking each step against a capacity you supply.
W = A·h·ρ·g; F_prop = (W·factor + W_imposed) / n Column Buckling Calculator
Euler and Johnson critical loads for a slender column, with the slenderness ratio and the governing formula reported.
Pcr = pi^2 E I / (K L)^2 ; Pjohnson = A (Fy - Fy^2 lambda^2 / 4 pi^2 E) Section Properties Calculator
Area, second moments of area, radii of gyration and section moduli for rectangles, boxes, pipes, I-sections and channels.
I = integral y^2 dA ; r = sqrt(I/A) ; S = I / c Retaining Wall Stability Calculator
Check overturning, sliding and bearing of a retaining wall from Rankine active earth pressure.
Ka = (1 - sin phi)/(1 + sin phi) ; FSo = W B/2 / sum(Pa y) ; FSs = (W tan(2phi/3) + cB) / Pa Anchor Pull-out Capacity Calculator
Check a mechanical anchor against both failure modes — concrete cone breakout and steel tension — and see which one actually limits it.
N_concrete = c * pi * d * L * k | N_design = min(N_concrete, N_steel) Roof Snow Load Calculator
Roof snow load from the ground value and the shape, exposure and thermal coefficients, with the extra force from drifting at an upstand.
p_k = mu * C_e * C_t * s_k Wind Load Calculator
Velocity pressure from the site, then the surface pressure and total force for a shape coefficient you supply for the surface in question.
q_p = 0.5*rho*v^2*c_e ; p = q_p*c_pe ; F = p*A*C_f Seismic Base Shear Calculator
Design base shear as the seismic weight times the response coefficient, with the ductility the structure is allowed to absorb shown alongside.
V = C_s * W