Project Wind Load Calculator
IS 875 (Part 3) : 2015 · Windows & FaçadesScope: wind pressure on windows, doors, glazing & cladding in the walls of enclosed rectangular buildings (Table 5). Envelope of all wind directions — orientation not required. Roofs, canopies, free-standing walls and non-rectangular forms are outside this tool.
01
Project
02
Opening Condition
Openings as % of wall area (Cl 7.3.2). A large door, loading bay or open floor that can stay open in a storm → choose > 20%.
03
Project Conditions
Vb from IS 875 (Part 3):2015 Annex A, as amended by Amendment No. 2 (2020). Not listed? Choose “Other location”.
Sets k1 (Table 1) and, near the coast, k4 (Cl. 6.3.4).
East & west coast sites within 60 km of the sea.
04
Building Dimensions
m
Up to the roof / parapet top. Below 10 m, k2 at 10 m is used.
m
Plan dimensions — order does not matter; the shorter side is taken as w.
m
05
What's around the building?
Judge the surroundings once everything nearby is built. On a corner, ridge or facing open ground on one side — choose the more exposed option.
Advanced engineering options
Non-cyclonic building0.90
Typical zone: 0.90 (Cl 7.2.1), 1.00 when cyclone-prone. Corner strips always 1.00 (conservative).
Sets topography factor k3 = 1 + C·s.
For a neighbouring building of the same or greater height (Fig 8). Ignore neighbours under one-third of this building's height.
Flat site1.000
Vb—
k1—
k2 at h—
k4—
Vz m/s—
pz kPa—
h/w · l/w—
Every factor is shown with its clause in the result — ready for your structural consultant.