Method — Geometry-based calculation
Direct geometry from the same footprint and perimeter used by the building above, so basement and superstructure describe one structure.
Every result below is produced by the same engineering engine that feeds the High-Rise reference project, so a quantity taken from this page and a quantity taken from the workflow cannot disagree.
Governing Formula
Governing Formula
V_slab = A x t x levels Where:
-
A= Basement footprint [m2] -
t= Base slab thickness [m]
Derived Equations:
Retaining walls:
V_wall = perimeter x depth x thickness x levels Basement reinforcement mass:
m_rebar = V_total x kg/m3 Slab plus both wall faces:
A_tanking = (A x levels + 2 x perimeter x depth x levels) Assumptions & Limitations
- No pile or raft foundation - pad footings or piles come from a dedicated calculator.
- No temporary works, dewatering, or earth support design.
- Tanking area excludes penetrations, joints and terminations.